Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.Serializable;

import javax.swing.JLabel;
import javax.swing.JOptionPane;

public class Main {
    public static void main(String[] args) {
        JOptionPane.showMessageDialog(null, new Colors());
    }

}

class Colors extends JLabel implements Serializable {
    private Color color; // not persistent

    private boolean rectangular; // is persistent

    public Colors() {
        addMouseListener(new MouseAdapter() {
            public void mousePressed(MouseEvent me) {
                change();
            }
        });
        rectangular = false;
        super.setPreferredSize(new Dimension(200, 100));
        change();
    }

    public boolean getRectangular() {
        return rectangular;
    }

    public void setRectangular(boolean flag) {
        this.rectangular = flag;
        repaint();
    }

    public void change() {
        color = randomColor();
        repaint();
    }

    private Color randomColor() {
        int r = (int) (255 * Math.random());
        int g = (int) (255 * Math.random());
        int b = (int) (255 * Math.random());
        return new Color(r, g, b);
    }

    public void paint(Graphics g) {
        Dimension d = getSize();
        int h = d.height;
        int w = d.width;
        g.setColor(color);
        if (rectangular) {
            g.fillRect(0, 0, w - 1, h - 1);
        } else {
            g.fillOval(0, 0, w - 1, h - 1);
        }
    }
}