import javax.swing.*;import java.awt.*;public class Exercise11_2 extends JFrame {  public Exercise11_2() {    add(new Grid());  }  /** Main method */  public static void main(String[] args) {    Exercise11_2 frame = new Exercise11_2();    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    frame.setSize(100, 80);    frame.setVisible(true);  }}class Grid extends JPanel {  protected void paintComponent(Graphics g) {    super.paintComponent(g);    g.setColor(Color.red);    g.drawLine(getWidth() / 3, 0, getWidth() / 3, getHeight());    g.drawLine(getWidth() * 2 / 3, 0, getWidth() * 2 / 3, getHeight());    g.setColor(Color.blue);    g.drawLine(0, getHeight() / 3, getWidth(), getHeight() / 3);    g.drawLine(0, getHeight() * 2 / 3, getWidth(), getHeight() * 2 / 3);  }}