1.继承Thread类，重写run方法

package com.thread;

//线程
public class Demo1 {
  public static void main(String[] args) {
    Cat cat = new Cat();
    //启动线程，会导致run函数的运行
    cat.start();
  }
}

class Cat extends Thread {
  // 重写run函数
  
  int times=0;
  public void run() {
    while (true) {      
      //休眠一秒，进入阻塞状态
      try {
        Thread.sleep(1000);
      } catch (InterruptedException e) {
        e.printStackTrace();
      }   
      times++;
      System.out.println("hello world"+times);
      if(times==10){
        //退出
        break;
      }
    }
  }
}


2.实现Runnable接口，重写run方法 

package com.thread;

public class Demo2 {

  public static void main(String[] args) {
    //启动
    Dog dog= new Dog();
    Thread t=new Thread(dog);
    t.start();
  }

}

class Dog implements Runnable {

  int times = 0;

  @Override
  public void run() {
    while (true) {
      // 休眠一秒，进入阻塞状态
      try {
        Thread.sleep(1000);
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
      times++;
      System.out.println("hello world" + times);
      if (times == 10) {
        // 退出
        break;
      }
    }

  }

}