Kalkulator Sederhana MVC

Kalkulator adalah sebuah alat hitung yang digunakan manusia untuk membantu proses perhitungan dalam kegiatan sehari-hari.

Kalkulator yang sering kita gunakan adalah kalkulator hard were yang didalamnya terdapat proses apa ketika kita gunakan kita tidak tahu,,yang kita tahu hanya keluar hasilnya dengan cepat lebih cepat dari perhitungan kita secara manual. Kali ini saya akan menjelaskan bagaimana cara membuat kalkulator dengan eclipse dengan bahasa Java, dan juga proses apa yag ada didalamnya.

1. Pertama kita buka eclipse, sebelumnya anda install dulu java jdk-Nya.

Buat project java file - New - Project misal kita kasih nama "Kalkulator"

2. Buat Package untuk menaruh meneu utama (main.java) misal kita buat package dengan nama calculator file - New – Package

3. Buat class utama dalam package calculator misal Main.java

4. file - new - class

5. Kita isikan script ini di view.java

package calculator;

import view.CalculatorView;

public class Main {

 public static void main(String[] args) {

  new CalculatorView().setVisible(true);

 }

}

6. Buat package view untuk menaruh class CalculatorView.java . Caranya file - new - package seperti membuat package diatas.

7. Buat class utama dalam package view misal CalculatorView.java

8. file - new - class seperti membuat class diatas.

9. Kita isikan script ini di CalculatorView.java

package view;

import java.text.DecimalFormat;

import model.CalculatorModel;

public class CalculatorView extends javax.swing.JFrame {

 private static final long serialVersionUID = 1L;

    public CalculatorView() {

        initComponents();

    }

    CalculatorModel model = new CalculatorModel();

    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())+"");

    }

    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 Java with Eclipse");

       

              

        jPanel1.setBackground(new java.awt.Color(150, 250, 200));

        resultLabel.setBackground(new java.awt.Color(255, 255, 200));

        resultLabel.setFont(new java.awt.Font("Microsoft Sans Serif", 0, 36));

        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, 268, 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(150, 250, 200));

        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(150, 250, 200));

        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("AC");

        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(buttonKurang, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)

                        .addGap(18, 18, 18)

                        .addComponent(buttonSeper, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE))

                    .addGroup(jPanel3Layout.createSequentialGroup()

                        .addComponent(buttonTambah, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)

                        .addGap(18, 18, 18)

                        .addComponent(buttonSamaDengan, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE))

                    .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)

                        .addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel3Layout.createSequentialGroup()

                            .addComponent(buttonKali, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)

                            .addGap(18, 18, 18)

                            .addComponent(buttonModulus, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE))

                        .addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel3Layout.createSequentialGroup()

                            .addComponent(buttonBagi, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)

                            .addGap(18, 18, 18)

                            .addComponent(buttonAC, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE))))

                .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(14, 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();

    }

    private void button1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_button1ActionPerformed

        getOperand(button1);

    }

    private void button2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_button2ActionPerformed

        getOperand(button2);

    }

    private void button3ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_button3ActionPerformed

        getOperand(button3);

    }

    private void button4ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_button4ActionPerformed

        getOperand(button4);

    }

    private void button5ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_button5ActionPerformed

        getOperand(button5);

    }

    private void button6ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_button6ActionPerformed

        getOperand(button6);

    }

    private void button7ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_button7ActionPerformed

        getOperand(button7);

    }

    private void button8ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_button8ActionPerformed

        getOperand(button8);

    }

    private void button9ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_button9ActionPerformed

        getOperand(button9);

    }

    private void buttonTambahActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_buttonTambahActionPerformed

        getOperator(1);

    }

    private void buttonKurangActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_buttonKurangActionPerformed

       getOperator(2);

    }

    private void buttonKaliActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_buttonKaliActionPerformed

        getOperator(3);

    }

    private void buttonBagiActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_buttonBagiActionPerformed

        getOperator(4);

    }

    private void buttonModulusActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_buttonModulusActionPerformed

        getOperator(5);

    }

    private void buttonSeperActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_buttonSeperActionPerformed

        getOperator(6);

    }

    private void buttonSamaDenganActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_buttonSamaDenganActionPerformed

        process();

    }

    private void button11ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_button11ActionPerformed

        getOperand(button11);

    }

    private void buttonKomaActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_buttonKomaActionPerformed

        getOperand(buttonKoma);

    }

    private void button12ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_button12ActionPerformed

        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) {//GEN-FIRST:event_buttonACActionPerformed

        operand = "";

        model.setOperator(0);

        model.setResult(0);

        resultLabel.setText("0");

    }

    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;

}

10. Buat package model untuk menaruh class model caranya seperti cara membuat package diatas file - new - package.

11. Buat class CalculatorModel.java di package model seperti membuat class diatas

12. file - new - class

13. Isikan script ini di class CalculatorModel.java

package model;

public class CalculatorModel {

    int operator=0;

    double operand1=0;

    double operand2=0;

    double result=0;

    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;

            default: result = operand1;

        }

        operand1=result;

    }

    public void setOperand1(double operand1) {

        this.operand1 = operand1;

    }

    public void setOperand2(double operand2) {

        this.operand2 = operand2;

    }

    public void clear(){

        setOperand1(0);

        setOperand2(0);

        setResult(0);

        setOperator(0);

    }

}

11. Run program dengan cara klik tombol segitiga hijau di bagian atas

dan hasilnya ini.

Sekian turtorial cara membuat kalkulator dengan java.