[Ch14] Pool Puzzle

package ch14;

import javax.swing.*;

import java.awt.*;

import java.util.concurrent.TimeUnit;

public class Animate {

  int x = 1;

  int y = 1;

  public static void main(String[] args) {

    Animate gui = new Animate();

    gui.go();

  }

  public void go() {

    JFrame frame = new JFrame();

    frame.setDefaultCloseOperation(

            JFrame.EXIT_ON_CLOSE);

    MyDrawP drawP = new MyDrawP();

    frame.getContentPane().add(drawP);

    frame.setSize(500, 270);

    frame.setVisible(true);

    for (int i = 0; i < 124; i++, y++, x++) {

      x++;

      drawP.repaint();

      try {

        TimeUnit.MILLISECONDS.sleep(50);

      } catch (Exception ex) {

      }

    }

  }

  class MyDrawP extends JPanel {

    public void paintComponent(Graphics g) {

      g.setColor(Color.white);

      g.fillRect(0, 0, 500, 250);

      g.setColor(Color.blue);

      g.fillRect(x, y, 500 - x * 2, 250 - y * 2);

    }

  }

}

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