MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class MainClass extends JPanel {

    public void paint(Graphics g) {

        Graphics2D g2 = (Graphics2D) g;

        RenderingHints rh = g2.getRenderingHints();
        rh.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setRenderingHints(rh);

        int x = 40, y = 40;

        g.setColor(Color.red);
        g.fillOval(x, y, 50, 50);

        Composite old = g2.getComposite();

        g2.setComposite(AlphaComposite.getInstance(AlphaComposite.CLEAR));

        g.setColor(Color.green);
        g.fillOval(x + 30, y + 30, 30, 30);

        g2.setComposite(old);

        g.setColor(Color.black);
        g.drawString("AlphaComposite.CLEAR", x, y + 80);

    }

    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);
    }
}