SwingCheckBoxes.java Source code

Introduction

Here is the source code for SwingCheckBoxes.java

Source

// : 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);
    }
} ///:~