Membuat program java kalkulator dengan metode MVC

Kali ini saya akan membuat program java gui kalkulator dengan metode MVC
buat project baru
isi class main :
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package kalkulator;

import view.KalkulatorView;

/**
 *
 * @author Novianto
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new KalkulatorView().setVisible(true);
    }

}

isi class KalkulatorModel
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package model;

/**
 *
 * @author Novianto
 */
public class KalkulatorModel {
    int operator=0;
    double operand1;
    double operand2;
    double result;

    public void setOperand(String opr) {
        if(!opr.equals("")){
            if(operator==0){
                operand1=Double.valueOf(opr);
            }else{
                operand2=Double.valueOf(opr);
            }
        }
    }

    public void setOperator(int operator) {
        this.operator = operator;
    }

    public double getResult() {
        return result;
    }

    public void setResult(double hasil) {
        this.result = hasil;
    }
  
    public void process(){
        switch (operator){
            case 1:
                result = operand1 + operand2;
                break;
            case 2:
                result = operand1 - operand2;
                break;
            case 3:
                result = operand1 * operand2;
                break;
            case 4:
                result = operand1 / operand2;
                break;
            case 5:
                result = operand1 % operand2;
                break;
            case 6:
                result = 1/operand1;
                break;
        }
        operand1=result;
    }

}

isi class KalkulatorView :
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * KalkulatorView.java
 *
 */

package view;

import java.text.DecimalFormat;
import javax.swing.JOptionPane;
import model.KalkulatorModel;

/**
 *
 * @author Novianto
 */
public class KalkulatorView extends javax.swing.JFrame {

    /** Creates new form CalculatorView */
    public KalkulatorView() {
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    KalkulatorModel model = new KalkulatorModel();
    String operand="";

    public void getOperand(javax.swing.JButton button){
        operand+=button.getText();
        model.setOperand(operand);
        resultLabel.setText(operand);
    }

    private void getOperator(int opt){
        model.setOperator(opt);
        operand="";
    }
    private void process(){
        DecimalFormat df = new DecimalFormat("#,###.########");
        model.process();
        operand = "";
        resultLabel.setText(df.format(model.getResult())+"");
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                         
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        resultLabel = new javax.swing.JLabel();
        jPanel2 = new javax.swing.JPanel();
        button7 = new javax.swing.JButton();
        button4 = new javax.swing.JButton();
        button1 = new javax.swing.JButton();
        buttonKoma = new javax.swing.JButton();
        button11 = new javax.swing.JButton();
        button12 = new javax.swing.JButton();
        button2 = new javax.swing.JButton();
        button3 = new javax.swing.JButton();
        button5 = new javax.swing.JButton();
        button6 = new javax.swing.JButton();
        button8 = new javax.swing.JButton();
        button9 = new javax.swing.JButton();
        jPanel3 = new javax.swing.JPanel();
        buttonBagi = new javax.swing.JButton();
        buttonKali = new javax.swing.JButton();
        buttonKurang = new javax.swing.JButton();
        buttonTambah = new javax.swing.JButton();
        buttonAC = new javax.swing.JButton();
        buttonModulus = new javax.swing.JButton();
        buttonSeper = new javax.swing.JButton();
        buttonSamaDengan = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Kalkulator Sederhana");

        jPanel1.setBackground(new java.awt.Color(255, 255, 255));

        resultLabel.setBackground(new java.awt.Color(255, 255, 255));
        resultLabel.setFont(new java.awt.Font("Microsoft Sans Serif", 0, 36)); // NOI18N
        resultLabel.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
        resultLabel.setText("0");

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(resultLabel, javax.swing.GroupLayout.DEFAULT_SIZE, 262, Short.MAX_VALUE)
                .addContainerGap())
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(resultLabel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );

        jPanel2.setBackground(new java.awt.Color(255, 255, 255));

        button7.setText("7");
        button7.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                button7ActionPerformed(evt);
            }
        });

        button4.setText("4");
        button4.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                button4ActionPerformed(evt);
            }
        });

        button1.setText("1");
        button1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                button1ActionPerformed(evt);
            }
        });

        buttonKoma.setText(".");
        buttonKoma.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                buttonKomaActionPerformed(evt);
            }
        });

        button11.setText("0");
        button11.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                button11ActionPerformed(evt);
            }
        });

        button12.setText("C");
        button12.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                button12ActionPerformed(evt);
            }
        });

        button2.setText("2");
        button2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                button2ActionPerformed(evt);
            }
        });

        button3.setText("3");
        button3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                button3ActionPerformed(evt);
            }
        });

        button5.setText("5");
        button5.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                button5ActionPerformed(evt);
            }
        });

        button6.setText("6");
        button6.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                button6ActionPerformed(evt);
            }
        });

        button8.setText("8");
        button8.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                button8ActionPerformed(evt);
            }
        });

        button9.setText("9");
        button9.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                button9ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel2Layout.createSequentialGroup()
                        .addComponent(button7, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(button8, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(button9, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(jPanel2Layout.createSequentialGroup()
                        .addComponent(button4, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(button5, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(button6, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(jPanel2Layout.createSequentialGroup()
                        .addComponent(button1, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(button2, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(button3, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(jPanel2Layout.createSequentialGroup()
                        .addComponent(buttonKoma, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(button11, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(button12, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(button7, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(button8, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(button9, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(button4, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(button5, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(button6, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(button1, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(button2, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(button3, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(buttonKoma, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(button11, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(button12, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        jPanel3.setBackground(new java.awt.Color(204, 255, 204));

        buttonBagi.setText("/");
        buttonBagi.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                buttonBagiActionPerformed(evt);
            }
        });

        buttonKali.setText("*");
        buttonKali.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                buttonKaliActionPerformed(evt);
            }
        });

        buttonKurang.setText("-");
        buttonKurang.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                buttonKurangActionPerformed(evt);
            }
        });

        buttonTambah.setText("+");
        buttonTambah.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                buttonTambahActionPerformed(evt);
            }
        });

        buttonAC.setText("Clear");
        buttonAC.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                buttonACActionPerformed(evt);
            }
        });

        buttonModulus.setText("%");
        buttonModulus.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                buttonModulusActionPerformed(evt);
            }
        });

        buttonSeper.setText("1/x");
        buttonSeper.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                buttonSeperActionPerformed(evt);
            }
        });

        buttonSamaDengan.setText("=");
        buttonSamaDengan.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                buttonSamaDenganActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
        jPanel3.setLayout(jPanel3Layout);
        jPanel3Layout.setHorizontalGroup(
            jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel3Layout.createSequentialGroup()
                .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel3Layout.createSequentialGroup()
                        .addComponent(buttonTambah, javax.swing.GroupLayout.PREFERRED_SIZE, 43, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(18, 18, 18)
                        .addComponent(buttonSamaDengan, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                    .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(jPanel3Layout.createSequentialGroup()
                            .addComponent(buttonKurang, javax.swing.GroupLayout.PREFERRED_SIZE, 43, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGap(18, 18, 18)
                            .addComponent(buttonSeper, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                        .addGroup(jPanel3Layout.createSequentialGroup()
                            .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                                .addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel3Layout.createSequentialGroup()
                                    .addComponent(buttonKali, javax.swing.GroupLayout.PREFERRED_SIZE, 43, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addGap(18, 18, 18)
                                    .addComponent(buttonModulus, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                                .addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel3Layout.createSequentialGroup()
                                    .addComponent(buttonBagi, javax.swing.GroupLayout.PREFERRED_SIZE, 43, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addGap(18, 18, 18)
                                    .addComponent(buttonAC)))
                            .addGap(0, 0, Short.MAX_VALUE))))
                .addContainerGap())
        );
        jPanel3Layout.setVerticalGroup(
            jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel3Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(buttonBagi, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(buttonAC, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(buttonKali, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(buttonModulus, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(buttonKurang, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(buttonSeper, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(buttonTambah, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(buttonSamaDengan, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                       

    private void button1ActionPerformed(java.awt.event.ActionEvent evt) {                                       
        getOperand(button1);
    }                                      

    private void button2ActionPerformed(java.awt.event.ActionEvent evt) {                                       
        getOperand(button2);
    }                                      

    private void button3ActionPerformed(java.awt.event.ActionEvent evt) {                                       
        getOperand(button3);
    }                                      

    private void button4ActionPerformed(java.awt.event.ActionEvent evt) {                                       
        getOperand(button4);
    }                                      

    private void button5ActionPerformed(java.awt.event.ActionEvent evt) {                                       
        getOperand(button5);
    }                                      

    private void button6ActionPerformed(java.awt.event.ActionEvent evt) {                                       
        getOperand(button6);
    }                                      

    private void button7ActionPerformed(java.awt.event.ActionEvent evt) {                                       
        getOperand(button7);
    }                                      

    private void button8ActionPerformed(java.awt.event.ActionEvent evt) {                                       
        getOperand(button8);
    }                                      

    private void button9ActionPerformed(java.awt.event.ActionEvent evt) {                                       
        getOperand(button9);
    }                                      

    private void buttonTambahActionPerformed(java.awt.event.ActionEvent evt) {                                            
        getOperator(1);
    }                                           

    private void buttonKurangActionPerformed(java.awt.event.ActionEvent evt) {                                            
       getOperator(2);
    }                                           

    private void buttonKaliActionPerformed(java.awt.event.ActionEvent evt) {                                          
        getOperator(3);
    }                                         

    private void buttonBagiActionPerformed(java.awt.event.ActionEvent evt) {                                          
        getOperator(4);
    }                                         

    private void buttonModulusActionPerformed(java.awt.event.ActionEvent evt) {                                             
        getOperator(5);
    }                                            

    private void buttonSeperActionPerformed(java.awt.event.ActionEvent evt) {                                           
        getOperator(6);
    }                                          

    private void buttonSamaDenganActionPerformed(java.awt.event.ActionEvent evt) {                                                
        process();
    }                                               

    private void button11ActionPerformed(java.awt.event.ActionEvent evt) {                                        
        getOperand(button11);
    }                                       

    private void buttonKomaActionPerformed(java.awt.event.ActionEvent evt) {                                          
        getOperand(buttonKoma);
    }                                         

    private void button12ActionPerformed(java.awt.event.ActionEvent evt) {                                        
        if(operand.length()>1){
            operand = operand.substring(0, operand.length()-1);
            model.setOperand(operand);
            resultLabel.setText(operand);
        }else{
            operand = "";
            model.setOperand(operand);
            resultLabel.setText("0");
        }      
    }                                       

    private void buttonACActionPerformed(java.awt.event.ActionEvent evt) {                                        
        operand = "";
        model.setOperator(0);
        model.setResult(0);
        resultLabel.setText("0");
    }                                       

    // Variables declaration - do not modify                    
    private javax.swing.JButton button1;
    private javax.swing.JButton button11;
    private javax.swing.JButton button12;
    private javax.swing.JButton button2;
    private javax.swing.JButton button3;
    private javax.swing.JButton button4;
    private javax.swing.JButton button5;
    private javax.swing.JButton button6;
    private javax.swing.JButton button7;
    private javax.swing.JButton button8;
    private javax.swing.JButton button9;
    private javax.swing.JButton buttonAC;
    private javax.swing.JButton buttonBagi;
    private javax.swing.JButton buttonKali;
    private javax.swing.JButton buttonKoma;
    private javax.swing.JButton buttonKurang;
    private javax.swing.JButton buttonModulus;
    private javax.swing.JButton buttonSamaDengan;
    private javax.swing.JButton buttonSeper;
    private javax.swing.JButton buttonTambah;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JPanel jPanel3;
    private javax.swing.JLabel resultLabel;
    // End of variables declaration                  

}

dan jika di run maka begini hasilnya :

Cukup sekian posting saya kali ini terimakasih

Baca Selengkapnya »

Kakulator Sederhana

Dalam kesempatan kali ini saya akan membuat kalkulator sederhana dengan program netbeans
pertama tama :
buka prgram netbeans dan buat project baru dan copy code di bawah ini:
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author Novianto
 */
public class TampilanKalkulator extends javax.swing.JFrame {

    /**
     * Creates new form TampilanKalkulator
     */
   
    String angka;
    double jumlah,angka1,angka2;
    int pilih;
   
    public TampilanKalkulator() {
        initComponents();
        angka="";
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                        
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jColorChooser1 = new javax.swing.JColorChooser();
        jFrame1 = new javax.swing.JFrame();
        jFrame2 = new javax.swing.JFrame();
        jFrame3 = new javax.swing.JFrame();
        jDialog1 = new javax.swing.JDialog();
        jMenu1 = new javax.swing.JMenu();
        jMenu2 = new javax.swing.JMenu();
        jInternalFrame1 = new javax.swing.JInternalFrame();
        jFrame4 = new javax.swing.JFrame();
        jFrame5 = new javax.swing.JFrame();
        jFrame6 = new javax.swing.JFrame();
        jInternalFrame2 = new javax.swing.JInternalFrame();
        choice1 = new java.awt.Choice();
        btnAngka0 = new javax.swing.JButton();
        btnKoma = new javax.swing.JButton();
        btnAngka1 = new javax.swing.JButton();
        btnAngka2 = new javax.swing.JButton();
        btnAngka3 = new javax.swing.JButton();
        btnAngka4 = new javax.swing.JButton();
        btnAngka5 = new javax.swing.JButton();
        btnAngka6 = new javax.swing.JButton();
        btnSamadengan = new javax.swing.JButton();
        btnTambah = new javax.swing.JButton();
        btnKurang = new javax.swing.JButton();
        btnKali = new javax.swing.JButton();
        btnAngka9 = new javax.swing.JButton();
        btnAngka7 = new javax.swing.JButton();
        btnAngka8 = new javax.swing.JButton();
        btnHapus = new javax.swing.JButton();
        btnBagi = new javax.swing.JButton();
        display = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();

        org.jdesktop.layout.GroupLayout jPanel1Layout = new org.jdesktop.layout.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 100, Short.MAX_VALUE)
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 100, Short.MAX_VALUE)
        );

        org.jdesktop.layout.GroupLayout jFrame1Layout = new org.jdesktop.layout.GroupLayout(jFrame1.getContentPane());
        jFrame1.getContentPane().setLayout(jFrame1Layout);
        jFrame1Layout.setHorizontalGroup(
            jFrame1Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 400, Short.MAX_VALUE)
        );
        jFrame1Layout.setVerticalGroup(
            jFrame1Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 300, Short.MAX_VALUE)
        );

        org.jdesktop.layout.GroupLayout jFrame2Layout = new org.jdesktop.layout.GroupLayout(jFrame2.getContentPane());
        jFrame2.getContentPane().setLayout(jFrame2Layout);
        jFrame2Layout.setHorizontalGroup(
            jFrame2Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 400, Short.MAX_VALUE)
        );
        jFrame2Layout.setVerticalGroup(
            jFrame2Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 300, Short.MAX_VALUE)
        );

        org.jdesktop.layout.GroupLayout jFrame3Layout = new org.jdesktop.layout.GroupLayout(jFrame3.getContentPane());
        jFrame3.getContentPane().setLayout(jFrame3Layout);
        jFrame3Layout.setHorizontalGroup(
            jFrame3Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 400, Short.MAX_VALUE)
        );
        jFrame3Layout.setVerticalGroup(
            jFrame3Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 300, Short.MAX_VALUE)
        );

        org.jdesktop.layout.GroupLayout jDialog1Layout = new org.jdesktop.layout.GroupLayout(jDialog1.getContentPane());
        jDialog1.getContentPane().setLayout(jDialog1Layout);
        jDialog1Layout.setHorizontalGroup(
            jDialog1Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 400, Short.MAX_VALUE)
        );
        jDialog1Layout.setVerticalGroup(
            jDialog1Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 300, Short.MAX_VALUE)
        );

        jMenu1.setText("jMenu1");

        jMenu2.setText("jMenu2");

        jInternalFrame1.setVisible(true);

        org.jdesktop.layout.GroupLayout jInternalFrame1Layout = new org.jdesktop.layout.GroupLayout(jInternalFrame1.getContentPane());
        jInternalFrame1.getContentPane().setLayout(jInternalFrame1Layout);
        jInternalFrame1Layout.setHorizontalGroup(
            jInternalFrame1Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 0, Short.MAX_VALUE)
        );
        jInternalFrame1Layout.setVerticalGroup(
            jInternalFrame1Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 0, Short.MAX_VALUE)
        );

        org.jdesktop.layout.GroupLayout jFrame4Layout = new org.jdesktop.layout.GroupLayout(jFrame4.getContentPane());
        jFrame4.getContentPane().setLayout(jFrame4Layout);
        jFrame4Layout.setHorizontalGroup(
            jFrame4Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 400, Short.MAX_VALUE)
        );
        jFrame4Layout.setVerticalGroup(
            jFrame4Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 300, Short.MAX_VALUE)
        );

        org.jdesktop.layout.GroupLayout jFrame5Layout = new org.jdesktop.layout.GroupLayout(jFrame5.getContentPane());
        jFrame5.getContentPane().setLayout(jFrame5Layout);
        jFrame5Layout.setHorizontalGroup(
            jFrame5Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 400, Short.MAX_VALUE)
        );
        jFrame5Layout.setVerticalGroup(
            jFrame5Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 300, Short.MAX_VALUE)
        );

        org.jdesktop.layout.GroupLayout jFrame6Layout = new org.jdesktop.layout.GroupLayout(jFrame6.getContentPane());
        jFrame6.getContentPane().setLayout(jFrame6Layout);
        jFrame6Layout.setHorizontalGroup(
            jFrame6Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 400, Short.MAX_VALUE)
        );
        jFrame6Layout.setVerticalGroup(
            jFrame6Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 300, Short.MAX_VALUE)
        );

        jInternalFrame2.setVisible(true);

        org.jdesktop.layout.GroupLayout jInternalFrame2Layout = new org.jdesktop.layout.GroupLayout(jInternalFrame2.getContentPane());
        jInternalFrame2.getContentPane().setLayout(jInternalFrame2Layout);
        jInternalFrame2Layout.setHorizontalGroup(
            jInternalFrame2Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 0, Short.MAX_VALUE)
        );
        jInternalFrame2Layout.setVerticalGroup(
            jInternalFrame2Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 0, Short.MAX_VALUE)
        );

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Kalkulator Sederhana");
        setBackground(new java.awt.Color(0, 0, 204));
        setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR));
        setResizable(false);

        btnAngka0.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnAngka0.setText("0");
        btnAngka0.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnAngka0ActionPerformed(evt);
            }
        });

        btnKoma.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnKoma.setText(",");
        btnKoma.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnKomaActionPerformed(evt);
            }
        });

        btnAngka1.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnAngka1.setText("1");
        btnAngka1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnAngka1ActionPerformed(evt);
            }
        });

        btnAngka2.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnAngka2.setText("2");
        btnAngka2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnAngka2ActionPerformed(evt);
            }
        });

        btnAngka3.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnAngka3.setText("3");
        btnAngka3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnAngka3ActionPerformed(evt);
            }
        });

        btnAngka4.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnAngka4.setText("4");
        btnAngka4.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnAngka4ActionPerformed(evt);
            }
        });

        btnAngka5.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnAngka5.setText("5");
        btnAngka5.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnAngka5ActionPerformed(evt);
            }
        });

        btnAngka6.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnAngka6.setText("6");
        btnAngka6.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnAngka6ActionPerformed(evt);
            }
        });

        btnSamadengan.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnSamadengan.setText("=");
        btnSamadengan.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnSamadenganActionPerformed(evt);
            }
        });

        btnTambah.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnTambah.setText("+");
        btnTambah.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnTambahActionPerformed(evt);
            }
        });

        btnKurang.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnKurang.setText("-");
        btnKurang.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnKurangActionPerformed(evt);
            }
        });

        btnKali.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnKali.setText("x");
        btnKali.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnKaliActionPerformed(evt);
            }
        });

        btnAngka9.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnAngka9.setText("9");
        btnAngka9.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnAngka9ActionPerformed(evt);
            }
        });

        btnAngka7.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnAngka7.setText("7");
        btnAngka7.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnAngka7ActionPerformed(evt);
            }
        });

        btnAngka8.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnAngka8.setText("8");
        btnAngka8.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnAngka8ActionPerformed(evt);
            }
        });

        btnHapus.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnHapus.setText("Clear");
        btnHapus.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnHapusActionPerformed(evt);
            }
        });

        btnBagi.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        btnBagi.setText("/");
        btnBagi.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnBagiActionPerformed(evt);
            }
        });

        display.setEditable(false);
        display.setBackground(new java.awt.Color(255, 255, 255));
        display.setFont(new java.awt.Font("Segoe UI Light", 0, 24)); // NOI18N
        display.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
        display.setDisabledTextColor(new java.awt.Color(0, 0, 204));

        jLabel1.setBackground(new java.awt.Color(153, 0, 153));
        jLabel1.setFont(new java.awt.Font("Tahoma", 1, 14)); // NOI18N
        jLabel1.setForeground(new java.awt.Color(0, 0, 204));
        jLabel1.setText("KALKULATOR SEDERHANA");

        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(org.jdesktop.layout.GroupLayout.TRAILING, layout.createSequentialGroup()
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
                    .add(org.jdesktop.layout.GroupLayout.LEADING, jLabel1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .add(layout.createSequentialGroup()
                        .addContainerGap()
                        .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
                            .add(org.jdesktop.layout.GroupLayout.LEADING, display)
                            .add(layout.createSequentialGroup()
                                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING, false)
                                    .add(layout.createSequentialGroup()
                                        .add(btnAngka7, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                                        .add(18, 18, 18)
                                        .add(btnAngka8, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                                        .add(18, 18, 18)
                                        .add(btnAngka9, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                                    .add(layout.createSequentialGroup()
                                        .add(btnAngka4, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                                        .add(18, 18, 18)
                                        .add(btnAngka5, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                                        .add(18, 18, 18)
                                        .add(btnAngka6, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                                    .add(btnHapus, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                    .add(layout.createSequentialGroup()
                                        .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING, false)
                                            .add(layout.createSequentialGroup()
                                                .add(btnAngka1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                                                .add(18, 18, 18)
                                                .add(btnAngka2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                                            .add(btnAngka0, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                                        .add(18, 18, 18)
                                        .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING, false)
                                            .add(btnKoma, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                                            .add(btnAngka3, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))))
                                .add(18, 18, 18)
                                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                                    .add(btnBagi, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                                    .add(btnKali, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                                    .add(btnKurang, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                                    .add(btnTambah, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                                    .add(btnSamadengan, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                                .add(0, 0, Short.MAX_VALUE)))))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(org.jdesktop.layout.GroupLayout.TRAILING, layout.createSequentialGroup()
                .add(jLabel1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 47, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                .add(display)
                .addPreferredGap(org.jdesktop.layout.LayoutStyle.UNRELATED)
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                    .add(btnHapus, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                    .add(btnBagi, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                    .add(btnAngka9, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                    .add(btnAngka7, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                    .add(btnAngka8, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                    .add(btnKali, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                    .add(btnAngka6, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                    .add(btnKurang, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                    .add(btnAngka4, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                    .add(btnAngka5, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                    .add(btnAngka1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                    .add(btnAngka2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                    .add(btnAngka3, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                    .add(btnTambah, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                    .add(btnAngka0, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                    .add(btnKoma, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                    .add(btnSamadengan, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 50, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                .addContainerGap())
        );

        pack();
    }// </editor-fold>                      

   

    private void btnSamadenganActionPerformed(java.awt.event.ActionEvent evt) {                                            
        // TODO add your handling code here:
        switch(pilih){
            case 1:
                angka2 = Double.parseDouble(angka);
                jumlah = angka1 + angka2;
                angka = Double.toString(jumlah);
                display.setText(angka);
                break;
            case 2:
                angka2 = Double.parseDouble(angka);
                jumlah = angka1 - angka2;
                angka = Double.toString(jumlah);
                display.setText(angka);
                break;
            case 3:
                angka2 = Double.parseDouble(angka);
                jumlah = angka1 * angka2;
                angka = Double.toString(jumlah);
                display.setText(angka);
                break;
            case 4:
                angka2 = Double.parseDouble(angka);
                jumlah = angka1 / angka2;
                angka = Double.toString(jumlah);
                display.setText(angka);
                break;
                default:
                break;
    }                  
    }                                            

    private void btnAngka0ActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
        angka += "0";
        display.setText(angka);
    }                                        

    private void btnAngka1ActionPerformed(java.awt.event.ActionEvent evt) {                                        
        angka += "1";
        display.setText(angka);        // TODO add your handling code here:
    }                                        

    private void btnAngka3ActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
        angka += "3";
        display.setText(angka);
    }                                        

    private void btnAngka2ActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
        angka += "2";
        display.setText(angka);
    }                                        

    private void btnAngka4ActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
        angka += "4";
        display.setText(angka);
    }                                        

    private void btnAngka5ActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
        angka += "5";
        display.setText(angka);
    }                                        

    private void btnAngka6ActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
        angka += "6";
        display.setText(angka);
    }                                        

    private void btnAngka7ActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
        angka += "7";
        display.setText(angka);
    }                                        

    private void btnAngka8ActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
        angka += "8";
        display.setText(angka);
    }                                        

    private void btnAngka9ActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
        angka += "9";
        display.setText(angka);
    }                                        

    private void btnTambahActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
        angka1=Double.parseDouble(angka);
        display.setText("+");
        angka="";
        pilih=1;
    }                                        

    private void btnKurangActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
        angka1=Double.parseDouble(angka);
        display.setText("-");
        angka="";
        pilih=2;
    }                                        

    private void btnKaliActionPerformed(java.awt.event.ActionEvent evt) {                                      
        // TODO add your handling code here:
        angka1=Double.parseDouble(angka);
        display.setText("*");
        angka="";
        pilih=3;
    }                                      

    private void btnBagiActionPerformed(java.awt.event.ActionEvent evt) {                                      
        // TODO add your handling code here:
        angka1=Double.parseDouble(angka);
        display.setText("/");
        angka="";
        pilih=4;
    }                                      

    private void btnHapusActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
        display.setText("");
        angka1=0.0;
        angka2=0.0;
        jumlah=0.0;
        angka="";
    }                                      

    private void btnKomaActionPerformed(java.awt.event.ActionEvent evt) {                                      
        // TODO add your handling code here:
        angka+=".";
        display.setText(angka);
    }                                      

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(TampilanKalkulator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(TampilanKalkulator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(TampilanKalkulator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(TampilanKalkulator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new TampilanKalkulator().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                    
    private javax.swing.JButton btnAngka0;
    private javax.swing.JButton btnAngka1;
    private javax.swing.JButton btnAngka2;
    private javax.swing.JButton btnAngka3;
    private javax.swing.JButton btnAngka4;
    private javax.swing.JButton btnAngka5;
    private javax.swing.JButton btnAngka6;
    private javax.swing.JButton btnAngka7;
    private javax.swing.JButton btnAngka8;
    private javax.swing.JButton btnAngka9;
    private javax.swing.JButton btnBagi;
    private javax.swing.JButton btnHapus;
    private javax.swing.JButton btnKali;
    private javax.swing.JButton btnKoma;
    private javax.swing.JButton btnKurang;
    private javax.swing.JButton btnSamadengan;
    private javax.swing.JButton btnTambah;
    private java.awt.Choice choice1;
    private javax.swing.JTextField display;
    private javax.swing.JColorChooser jColorChooser1;
    private javax.swing.JDialog jDialog1;
    private javax.swing.JFrame jFrame1;
    private javax.swing.JFrame jFrame2;
    private javax.swing.JFrame jFrame3;
    private javax.swing.JFrame jFrame4;
    private javax.swing.JFrame jFrame5;
    private javax.swing.JFrame jFrame6;
    private javax.swing.JInternalFrame jInternalFrame1;
    private javax.swing.JInternalFrame jInternalFrame2;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JMenu jMenu1;
    private javax.swing.JMenu jMenu2;
    private javax.swing.JPanel jPanel1;
    // End of variables declaration                  
}

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