Java多线程继承Thread类详解

package JavaThread;class firstThread extends Thread{ private String name = null; public firstThread(String str) {  this.name = str; } public void run() {  for(int i=1;i<=3;i++)  {   System.out.println("线程"+this.name+"第"+i +"执行");   try {    Thread.sleep(50);   } catch (InterruptedException e) {        e.printStackTrace();   }  } }}class secondThread extends Thread{ private String name = null; public secondThread(String s) {  this.name = s; } public void run() {  for(int i=1;i<=3;i++)  {   System.out.println("线程"+this.name+"第"+i +"执行");   try {    Thread.sleep(50);    Thread.yield();   } catch (InterruptedException e) {     e.printStackTrace();   }  } }}public class TestThread{ public static void main(String[] args) {  firstThread p = new firstThread("first");  secondThread pth = new secondThread("second");  p.setPriority(4);  pth.setPriority(9);  p.start();  pth.start(); }}

  /*  * 示例：创建三个线程，每过2秒打印一下线程的名称，打印三次  */  public class Thread1 extends Thread{    private final int MAX = 3;//最大打印次数    private int COUNT = 1;//计数    private final int TIME = 2;//间隔时间      //接收线程名称    public Thread1(String name) {      super(name);    }    //覆盖run方法，在里面写我们要执行的代码    public void run() {      while(COUNT<= MAX){        System.out.println(this.getName());        COUNT++;        //每次打印后，在一段时间后再打印        try {          Thread.sleep(TIME*1000);        } catch (InterruptedException e) {          e.printStackTrace();        }      }    }    public static void main(String[] args) {      Thread1 t1 = new Thread1("线程1");//创建线程      Thread1 t2 = new Thread1("线程2");      Thread1 t3 = new Thread1("线程3");      t1.start(); //开启线程      t2.start();      t3.start();      //也可以使用下面这种方式书写      //new Thread1("线程4").start();    }  }