// Demonstrate JCheckbox.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/*
<applet code="JCheckBoxDemo" width=270 height=50>
</applet>
*/
public class JCheckBoxDemo extends JApplet
implements ItemListener {
JLabel jlab;
public void init() {
try {
SwingUtilities.invokeAndWait(
new Runnable() {
public void run() {
makeGUI();
}
}
);
} catch (Exception exc) {
System.out.println("Can't create because of " + exc);
}
}
private void makeGUI() {
// Change to flow layout.
setLayout(new FlowLayout());
// Add check boxes to the content pane.
JCheckBox cb = new JCheckBox("C");
cb.addItemListener(this);
add(cb);
cb = new JCheckBox("C++");
cb.addItemListener(this);
add(cb);
cb = new JCheckBox("Java");
cb.addItemListener(this);
add(cb);
cb = new JCheckBox("Perl");
cb.addItemListener(this);
add(cb);
// Create the label and add it to the content pane.
jlab = new JLabel("Select languages");
add(jlab);
}
// Handle item events for the check boxes.
public void itemStateChanged(ItemEvent ie) {
JCheckBox cb = (JCheckBox)ie.getItem();
if(cb.isSelected())
jlab.setText(cb.getText() + " is selected");
else
jlab.setText(cb.getText() + " is cleared");
}
}