在随机位置绘制点

import java.awt.Graphics;


import javax.swing.JComponent;// from nowjava - 时代Java


public class Main extends JComponent implements Runnable {

  Thread t;


  public void init() {

    t = new Thread(this);

    t.start();

  }


  public void run() {

    try {


      while (true) {

        Thread.sleep(200);

      }

    } catch (Exception e) {//来自 n o w j a v a . c o m - 时  代  Java

    }


  }


  public void update(Graphics g) {

    paint(g);

  }


  public void paint(Graphics g) {


    int x = (