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Compositing is the combining of elements from separate sources into single images

import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import javax.swing.JFrame; import javax.swing.JPanel; public class CompositingDST extends JPanel {   public void paint(Graphics g) {     Graphics2D g2d = (Graphics2D) g;     AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.DST, 0.5f);     BufferedImage buffImg = new BufferedImage(60, 60, BufferedImage.TYPE_INT_ARGB);     Graphics2D gbi = buffImg.createGraphics();     gbi.setPaint(Color.red);     gbi.fillRect(0, 0, 40, 40);     gbi.setComposite(ac);     gbi.setPaint(Color.green);     gbi.fillRect(5, 5, 40, 40);     g2d.drawImage(buffImg, 20, 20, null);   }   public static void main(String[] args) {     JFrame frame = new JFrame("Composition");     frame.add(new CompositingDST());     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     frame.setSize(400, 120);     frame.setVisible(true);   } }