0 contoh GUI pada Java

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

/* @author Sebastian
*/
class swingFrame extends JFrame {

private int lebar = 320;
private int tinggi = 125;

public swingFrame() {
Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
setTitle("Swing Components");
setSize(lebar, tinggi);
setLocation((screen.width - this.lebar) / 2, (screen.height - this.tinggi) / 2);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setResizable(false);

swingPanel panel = new swingPanel();
Container cont = new Container();
cont = getContentPane();
cont.setLayout(null);
panel.setBounds(35, 20, 250, 50);
cont.add(panel);
}
}

class swingPanel extends JPanel {

private JButton fakbutton = new JButton("Proses");
private JButton reset = new JButton("Reset");
private JTextField angka1 = new JTextField("");
private JTextField hasil = new JTextField("");

public swingPanel() {
fakbutton.addActionListener(new fungsiAction());
reset.addActionListener(new fungsiAction());
hasil.setEditable(false);

setLayout(new GridLayout(2, 2, 5, 5));
add(angka1);
add(fakbutton);
add(hasil);
add(reset);
}

int faktorial(int x) {
if (x == 1) return 1;
else return x * faktorial(x - 1);
}

private class fungsiAction implements ActionListener {

public void actionPerformed(ActionEvent ae) {
try {
if (ae.getActionCommand().equals("Proses")) {
int var = Integer.parseInt(angka1.getText());
hasil.setText(Integer.toString(faktorial(var)));
fakbutton.setEnabled(false);
} else {
angka1.setText("");
hasil.setText("");
fakbutton.setEnabled(true);
}

} catch (Exception e) {
JOptionPane.showMessageDialog(null, "angka yang anda masukan salah",
"ERROR", JOptionPane.ERROR_MESSAGE);
}
}
}
}

public class Swing {

public static void main(String[] args) {
swingFrame frame = new swingFrame();
frame.setVisible(true);
}
}

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