MEMBUAT PROGRAM SEDERHANA MENGHITUNG VOLUME BALOK DENGAN JAVA SWING

Assalamualaikum Wr. Wb..

Langsung saja, saya akan sharing source code program Java GUI menghitung volume balok, berikut codenya :

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class volumeBalok implements ActionListener {
    public JLabel label1, label2, label3, label4;
    public JTextField textField1, textField2, textField3, textField4;
    public JButton button, button1;

    public volumeBalok() {

        label1 = new JLabel("Nilai Panjang");
        label1.setLocation(10, 10);
        label1.setSize(label1.getPreferredSize());

        textField1 = new JTextField(20);
        textField1.setLocation(10, 25);
        textField1.setSize(textField1.getPreferredSize());

        label2 = new JLabel("Nilai Lebar");
        label2.setLocation(10, 45);
        label2.setSize(label2.getPreferredSize());

        textField2 = new JTextField(20);
        textField2.setLocation(10, 60);
        textField2.setSize(textField2.getPreferredSize());

        label3 = new JLabel("Nilai Tinggi");
        label3.setLocation(10, 80);
        label3.setSize(label3.getPreferredSize());

        textField3 = new JTextField(20);
        textField3.setLocation(10, 95);
        textField3.setSize(textField3.getPreferredSize());

        label4 = new JLabel("Volume Balok");
        label4.setLocation(10, 155);
        label4.setSize(label4.getPreferredSize());

        textField4 = new JTextField(20);
        textField4.setLocation(10, 170);
        textField4.setSize(textField4.getPreferredSize());

        button = new JButton("Hitung Volume");
        button.setLocation(245, 165);
        button.setSize(button.getPreferredSize());
        button.addActionListener(this);
        button.setMnemonic('V');

        button1 = new JButton("About");
        button1.setLocation(275, 70);
        button1.setSize(button1.getPreferredSize());
        button1.addActionListener(this);
        button1.setMnemonic('A');
    }

    public void createAndShowGUI() {
        JFrame.setDefaultLookAndFeelDecorated(true);
        JFrame frame = new JFrame("Hitung Volume Balok");
        frame.setLayout(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.getContentPane().add(label1);
        frame.getContentPane().add(textField1);
        frame.getContentPane().add(label2);
        frame.getContentPane().add(textField2);
        frame.getContentPane().add(label3);
        frame.getContentPane().add(textField3);
        frame.getContentPane().add(label4);
        frame.getContentPane().add(textField4);
        frame.getContentPane().add(button);
        frame.getContentPane().add(button1);

        frame.setBounds(0, 0, 400, 250);
        frame.setLocationRelativeTo(null);

        frame.setVisible(true);
    }

    public void actionPerformed(ActionEvent event) {
        double a=0.0, b=0.0, c=0.0, d=0.0;

        try {
            a = Double.parseDouble(textField1.getText());
            b = Double.parseDouble(textField2.getText());
            c = Double.parseDouble(textField3.getText());
        } catch(NumberFormatException nfe) {
            nfe.printStackTrace();
        }

        JButton btn = (JButton) event.getSource();
        if(btn == button) {
            d = a * b * c;
        }

        if(btn == button1) {
            JOptionPane.showMessageDialog(null,"Program GUI JAVA Menghitung Volume Balok\nby : Fajar",
            "Informasi Program",
            JOptionPane.INFORMATION_MESSAGE);
        }

        textField4.setText(new String().valueOf(d));
    }

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                volumeBalok app = new volumeBalok();
                app.createAndShowGUI();
            }
        });
    }
}

Setelah di-compile, hasilnya outputnya seperti berikut :