testmyfirstthread.java

多线程 课堂讲解代码 很经典的

public class TestMyFirstThread  {
  public static void main(String[] args) {
    System.out.println("main线程开始运行");
    MyFirstThread thread1 = new MyFirstThread(1); //创建线程1
    MyFirstThread thread2 = new MyFirstThread(2); //创建线程2
    thread1.start(); // 启动线程1
    thread2.start(); // 启动线程2
    System.out.println("main线程运行结束" );
  } // main()方法结束
} // 类TestMyThread结束

 // 声明MyThread类
class MyFirstThread extends Thread {
  int num;
  public MyFirstThread(int num) {
    this.num = num;
  }

  public void run() { // 重载run方法
    for (int i=1; i < 8000000; i++) {  //循环800000次
      if (i%200000 == 0)               //每循环20000次打印一次
        System.out.print(num);
    } // for 结束
  } // run()方法结束
} // 类MyFirstThread结束