Swing CheckBoxes
// : c14:SwingCheckBoxes.java
// <applet code=SwingCheckBoxes width=200 height=200></applet>
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
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;
public class SwingCheckBoxes 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 SwingCheckBoxes(), 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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