Java tutorial
import java.awt.Color; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel { public void paint(Graphics g) { g.setColor(Color.red); Graphics clippedGraphics = g.create(); clippedGraphics.drawRect(0, 0, 100, 100); clippedGraphics.clipRect(25, 25, 50, 50); clippedGraphics.drawLine(0, 0, 100, 100); clippedGraphics.dispose(); clippedGraphics = null; g.drawLine(0, 100, 100, 0); } 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); } }