Contoh Soal Java

1. Contoh Program Event Handling di Java.
Pada contoh berikut ini ditambahkan window konfirmasi saat tombol exit ditekan.
Berikut ini tampilannya:

Listing:

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class ClickMe3 extends JFrame {

private JButton tombol, btnExit;

public ClickMe3() {

super (“Event Handling”);

Container container = getContentPane();

container.setLayout(new FlowLayout());

ClickListener cl = new ClickListener ();

tombol = new JButton (“Click Me!”);

tombol.addActionListener(cl);

container.add(tombol);

btnExit = new JButton (“Exit”);

btnExit.addActionListener(cl);

container.add(btnExit);

setSize (200,100);

setVisible (true);

}

public static void main (String arg[]) {

ClickMe3 test = new ClickMe3();

test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

//inner class

private class ClickListener implements ActionListener {

public void actionPerformed (ActionEvent e) {

if (e.getSource() == tombol) {

JOptionPane.showMessageDialog(null, “You click me again, guys !!!”);

} else if (e.getSource() == btnExit){

if ( JOptionPane.showConfirmDialog(null, “Apakah Anda yakin akan keluar ?”,”Konfirmasi”,

JOptionPane.OK_CANCEL_OPTION,JOptionPane.QUESTION_MESSAGE) == JOptionPane.OK_OPTION) {

System.exit(0);

}

}

}

}

}

2.Contoh Massage Dialog dijava

Contoh program berikut ini menampilkan jenis-jenis window pesan di Java. Window pesan (message dialog) antara lain bertipe warning message, information message, confirmation message, dan juga input message. Class yang digunakan adalah class JOptionPane.

Berikut ini tampilannya:

Listing:

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class MessageDialog extends JFrame {

private JButton tombol, btn2, btn3, btn4, btn5;

public MessageDialog() {

super (“Event Handling”);

Container container = getContentPane();

container.setLayout(new FlowLayout());

tombol = new JButton (“Message Dialog”);

tombol.addActionListener(

new ActionListener() {

public void actionPerformed (ActionEvent e) {

JOptionPane.showMessageDialog (null,”Contoh Message Dialog”);

}

}

);

container.add(tombol);

btn2 = new JButton (“Warning Message”);

btn2.addActionListener(

new ActionListener() {

public void actionPerformed (ActionEvent e) {

JOptionPane.showConfirmDialog(null, “Contoh Warning Message”,”Peringatan”,

JOptionPane.CLOSED_OPTION, JOptionPane.WARNING_MESSAGE);

}

}

);

container.add(btn2);

btn3 = new JButton (“Question Message”);

btn3.addActionListener(

new ActionListener() {

public void actionPerformed (ActionEvent e) {

JOptionPane.showConfirmDialog(null, “Contoh Question Message”,”Pertanyaan”,

JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE);

}

}

);

container.add(btn3);

btn4 = new JButton (“Information Message”);

btn4.addActionListener(

new ActionListener() {

public void actionPerformed (ActionEvent e) {

JOptionPane.showConfirmDialog(null, “Contoh Information Message”,”Informasi”,

JOptionPane.NO_OPTION, JOptionPane.INFORMATION_MESSAGE);

}

}

);

container.add(btn4);

btn5 = new JButton (“Input Dialog”);

btn5.addActionListener(

new ActionListener() {

public void actionPerformed (ActionEvent e) {

String a = JOptionPane.showInputDialog(“Input Nama : “);

JOptionPane.showMessageDialog(null, a);

}

}

);

container.add(btn5);

setSize (200,300);

setLocationRelativeTo(null);

setVisible (true);

}

public static void main (String arg[]) {

MessageDialog test = new MessageDialog();

test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}

 

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