Java Source Codes

Swing's Check Box

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JApplet;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

/**
* Example of Swing's Check Boxes and its Event
* @author jimmi.prajapati
*
*/
public class SwingCheckBoxesDemo extends JApplet {
private JTextArea t = new JTextArea(6, 15);

private JCheckBox cb1 = new JCheckBox("Check Box 1"), cb2 = new JCheckBox(
"Check Box 2"), cb3 = new JCheckBox("Check Box 3");

public void init() {
cb1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
trace("1", cb1);
}
});
cb2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
trace("2", cb2);
}
});
cb3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
trace("3", cb3);
}
});
Container cp = getContentPane();
cp.setLayout(new FlowLayout());
cp.add(new JScrollPane(t));
cp.add(cb1);
cp.add(cb2);
cp.add(cb3);
}

private void trace(String b, JCheckBox cb) {
if (cb.isSelected())
t.append("Box " + b + " Set\n");
else
t.append("Box " + b + " Cleared\n");
}

public static void main(String[] args) {
run(new SwingCheckBoxesDemo(), 200, 200);
}

public static void run(JApplet applet, int width, int height) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(applet);
frame.setSize(width, height);
applet.init();
applet.start();
frame.setVisible(true);
}
}

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