java 创建线程的两种方法

//一种是声明 Thread 的子类,重载 Thread 类的方法 run

public class MyThread  extends Thread {

  public void run() {

    for (int count = 1, row = 1; row < 20; row++, count++) {

      for (int i = 0; i < count; i++)

        System.out.print('*');

      System.out.print('\n');

    }

  }

 //运行时可以有两种方法,A,B.

  public static void main(String[] args) {

    // MyThread mt = new MyThread();//A

    //mt.start();//A

    Thread myThread = new Thread(new MyThread());//B

    myThread.start();//B

    

  }
}

//另一种途径是声明一个类，该类实现 Runnable 接口。然后再实现方法 run。

public class MyThread1 implements Runnable {

  public void run() {

    for (int count = 1, row = 1; row < 20; row++, count++) {

      for (int i = 0; i < count; i++)

        System.out.print('*');

      System.out.print('\n');

    }

  }

//运行时只能有一种方法B.

  public static void main(String[] args) {

   //MyThread1 mt = new MyThread1();

   // mt.start();

    Thread myThread1 = new Thread(new MyThread1());

    myThread1.start();

    for (int i = 0; i < 500; i++) {

      System.out.println(i);

    }

  }

  

}