MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import javax.swing.Icon;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class MainClass extends JPanel implements ItemListener {
    public MainClass() {
        // Add check boxes to the content pane.
        Icon normal = new MyIcon(Color.red);
        Icon rollover = new MyIcon(Color.YELLOW);
        Icon selected = new MyIcon(Color.BLUE);

        JCheckBox cb = new JCheckBox("www.java2s.com", normal);
        cb.setRolloverIcon(rollover);
        cb.setSelectedIcon(selected);
        cb.addItemListener(this);
        add(cb);

    }

    public void itemStateChanged(ItemEvent ie) {
        JCheckBox cb = (JCheckBox) ie.getItem();
        int state = ie.getStateChange();
        if (state == ItemEvent.SELECTED)
            System.out.println(cb.getText() + " selected");
        else
            System.out.println(cb.getText() + " cleared");
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.getContentPane().add(new MainClass());

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(200, 200);
        frame.setVisible(true);
    }

}

class MyIcon implements Icon {
    Color cl;

    public MyIcon(Color c) {
        cl = c;
    }

    public int getIconWidth() {
        return 32;
    }

    public int getIconHeight() {
        return 32;
    }

    public void paintIcon(Component c, Graphics g, int x, int y) {
        g.setColor(cl);
        g.drawString("java2s.com", 0, 20);
    }
}