java多线程中执行多个程序的实例分析

import java.awt.Graphics;

import java.util.Random;

public class ThreadClass extends Thread{

public Graphics g;

//用构造器传参的办法将画布传入ThreadClass类中

public ThreadClass(Graphics g){

this .g=g;

}

public void run(){

//获取随机的x,y坐标作为小球的坐标

Random ran= new Random();

int x=ran.nextInt( 900 );

int y=ran.nextInt( 900 );

for ( int i= 0 ;i< 100 ;i++){

g.fillOval(x+i,y+i, 30 , 30 );

try {

Thread.sleep( 30 );

} catch (Exception ef){

}

}

}

}

public void actionPerformed(ActionEvent e){

ThreadClass thc= new ThreadClass(g);

thc.start();

}

public class Main {

   //method to print numbers from 1 to 10

   public static void printNumbers() {

     for ( int i = 1 ; i <= 10 ; i++) {

       System.out.print(i + " " );

     }

     //printing new line

     System.out.println();

   }

   //main code  

   public static void main(String[] args) {

     //thread object creation

     Thread one = new Thread(Main::printNumbers);

     Thread two = new Thread(Main::printNumbers);

     //starting the threads

     one.start();

     two.start();

   }

}