Java NetBeans Membuat Kalkulator Sederhana

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Tutorial Belajar Pemrograman Java NetBeans Pemula
Berikut ini ialah tutorial video membuat GUI application Java NetBeans untuk program kalkulator sederhana.



Untuk source code program kalkulator sederhana ini sendiri ialah sebagai berikut.

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package AppPackage;

/**
 *
 * @author Loki Lang
 */
public class simpleCalculator extends javax.swing.JFrame {
String numberString = "";
String dataString = "";
int option;
double number1, number2, result;
    /**
     * Creates new form simpleCalculator
     */
    public simpleCalculator() {
        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.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        display = new javax.swing.JTextField();
        oneButton = new javax.swing.JButton();
        twoButton = new javax.swing.JButton();
        threeButton = new javax.swing.JButton();
        fourButton = new javax.swing.JButton();
        fiveButton = new javax.swing.JButton();
        sixButton = new javax.swing.JButton();
        sevenButton = new javax.swing.JButton();
        eightButton = new javax.swing.JButton();
        nineButton = new javax.swing.JButton();
        zeroButton = new javax.swing.JButton();
        decButton = new javax.swing.JButton();
        clearButton = new javax.swing.JButton();
        resultButton = new javax.swing.JButton();
        addButton = new javax.swing.JButton();
        subButton = new javax.swing.JButton();
        mulButton = new javax.swing.JButton();
        divButton = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Simple Calculator");

        display.setEnabled(false);

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        mulButton.setText("X");
        mulButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                mulButtonActionPerformed(evt);
            }
        });

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

        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, false)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(oneButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(twoButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(threeButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(fourButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(fiveButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(sixButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(sevenButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(eightButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(nineButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(zeroButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(decButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(resultButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addComponent(display))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(addButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(subButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(mulButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(divButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(clearButton, javax.swing.GroupLayout.PREFERRED_SIZE, 50, 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()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(display)
                    .addComponent(clearButton, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(threeButton)
                            .addComponent(twoButton)
                            .addComponent(oneButton))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(fourButton)
                            .addComponent(fiveButton)
                            .addComponent(sixButton))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(nineButton)
                            .addComponent(eightButton)
                            .addComponent(sevenButton))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(zeroButton)
                            .addComponent(decButton)
                            .addComponent(resultButton)))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(addButton)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(subButton)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(mulButton)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(divButton)))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
        setLocationRelativeTo(null);
    }// </editor-fold>//GEN-END:initComponents

    private void oneButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_oneButtonActionPerformed
numberString += "1";
display.setText(numberString);
// TODO add your handling code here:
    }//GEN-LAST:event_oneButtonActionPerformed

    private void twoButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_twoButtonActionPerformed
numberString += "2";
display.setText(numberString);
// TODO add your handling code here:
    }//GEN-LAST:event_twoButtonActionPerformed

    private void threeButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_threeButtonActionPerformed
numberString += "3";
display.setText(numberString);
// TODO add your handling code here:
    }//GEN-LAST:event_threeButtonActionPerformed

    private void fourButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_fourButtonActionPerformed
numberString += "4";
display.setText(numberString);
// TODO add your handling code here:
    }//GEN-LAST:event_fourButtonActionPerformed

    private void fiveButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_fiveButtonActionPerformed
numberString += "5";
display.setText(numberString);
// TODO add your handling code here:
    }//GEN-LAST:event_fiveButtonActionPerformed

    private void sixButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_sixButtonActionPerformed
numberString += "6";
display.setText(numberString);
// TODO add your handling code here:
    }//GEN-LAST:event_sixButtonActionPerformed

    private void sevenButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_sevenButtonActionPerformed
numberString += "7";
display.setText(numberString);
// TODO add your handling code here:
    }//GEN-LAST:event_sevenButtonActionPerformed

    private void eightButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_eightButtonActionPerformed
numberString += "8";
display.setText(numberString);
// TODO add your handling code here:
    }//GEN-LAST:event_eightButtonActionPerformed

    private void nineButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_nineButtonActionPerformed
numberString += "9";
display.setText(numberString);
// TODO add your handling code here:
    }//GEN-LAST:event_nineButtonActionPerformed

    private void zeroButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_zeroButtonActionPerformed
numberString += "0";
display.setText(numberString);
// TODO add your handling code here:
    }//GEN-LAST:event_zeroButtonActionPerformed

    private void decButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_decButtonActionPerformed
numberString += ".";
display.setText(numberString);
// TODO add your handling code here:
    }//GEN-LAST:event_decButtonActionPerformed

    private void clearButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_clearButtonActionPerformed
numberString = "";
number1 = number2 = result = 0.0;
display.setText(null);
// TODO add your handling code here:
    }//GEN-LAST:event_clearButtonActionPerformed

    private void addButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_addButtonActionPerformed
number1 = Double.parseDouble(numberString);
numberString = "";
display.setText("+");
option = 1;// TODO add your handling code here:
    }//GEN-LAST:event_addButtonActionPerformed

    private void subButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_subButtonActionPerformed
number1 = Double.parseDouble(numberString);
numberString = "";
display.setText("-");
option = 2;// TODO add your handling code here:
    }//GEN-LAST:event_subButtonActionPerformed

    private void mulButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_mulButtonActionPerformed
number1 = Double.parseDouble(numberString);
numberString = "";
display.setText("X");
option = 3;// TODO add your handling code here:
    }//GEN-LAST:event_mulButtonActionPerformed

    private void divButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_divButtonActionPerformed
number1 = Double.parseDouble(numberString);
numberString = "";
display.setText("/");
option = 4;// TODO add your handling code here:
    }//GEN-LAST:event_divButtonActionPerformed

    private void resultButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_resultButtonActionPerformed
switch(option)
{
    case 1:
        number2 = Double.parseDouble(numberString);
        result = number1 + number2;
        number1 = result;
        display.setText(Double.toString(result));
        numberString = display.getText();
        break;
    case 2:
        number2 = Double.parseDouble(numberString);
        result = number1 - number2;
        number1 = result;
        display.setText(Double.toString(result));
        numberString = display.getText();
        break;
    case 3:
        number2 = Double.parseDouble(numberString);
        result = number1 * number2;
        number1 = result;
        display.setText(Double.toString(result));
        numberString = display.getText();
        break;
    case 4:
        number2 = Double.parseDouble(numberString);
        result = number1 / number2;
        display.setText(Double.toString(result));
        numberString = display.getText();
        break;
    default:
        break;
}// TODO add your handling code here:
    }//GEN-LAST:event_resultButtonActionPerformed

    /**
     * @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(simpleCalculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(simpleCalculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(simpleCalculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(simpleCalculator.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 simpleCalculator().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton addButton;
    private javax.swing.JButton clearButton;
    private javax.swing.JButton decButton;
    private javax.swing.JTextField display;
    private javax.swing.JButton divButton;
    private javax.swing.JButton eightButton;
    private javax.swing.JButton fiveButton;
    private javax.swing.JButton fourButton;
    private javax.swing.JButton mulButton;
    private javax.swing.JButton nineButton;
    private javax.swing.JButton oneButton;
    private javax.swing.JButton resultButton;
    private javax.swing.JButton sevenButton;
    private javax.swing.JButton sixButton;
    private javax.swing.JButton subButton;
    private javax.swing.JButton threeButton;
    private javax.swing.JButton twoButton;
    private javax.swing.JButton zeroButton;
    // End of variables declaration//GEN-END:variables
}

Untuk tampilan GUI ini sendiri tampak pada gambar berikut.

Sedangkan untuk component yang digunakan ialah sebagai berikut.

Berikut adalah link untuk download source code dan juga program Java NetBeans kalkulator sederhana.

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