package demo.thread; 
 
public class TreadDemo1 implements Runnable { 
  private int countDown = 10; 
  @Override 
  // 在run方法中定义任务 
  public void run() { 
    while (countDown-- > 0) { 
      System.out.println("#" + Thread.currentThread().getName() + "(" 
          + countDown + ")"); 
    } 
  } 
 
  public static void main(String[] args) { 
    // Runnable中run方法是一个空方法，并不会产生任何线程行为，必须显式地将一个任务附着到线程上 
    TreadDemo1 tt=new TreadDemo1(); 
    new Thread(tt).start(); 
    new Thread(tt).start(); 
    System.out.println("火箭发射前倒计时："); 
  } 
} 

#Thread-1(8)
#Thread-1(7)
#Thread-1(6)
#Thread-1(5)
#Thread-1(4)
#Thread-1(3)
#Thread-1(2)
#Thread-1(1)
#Thread-1(0)
#Thread-0(9)

package demo.thread; 
 
public class ThreadDemo2 extends Thread { 
  private int countDown = 10; 
 
  @Override 
  // 在run方法中定义任务 
  public void run() { 
    while (countDown-- > 0) { 
      System.out.println("#" + this.getName() + "(" + countDown + ")"); 
    } 
  } 
 
  public static void main(String[] args) { 
    new ThreadDemo2().start(); 
    new ThreadDemo2().start(); 
    // 由于start方法迅速返回，所以main线程可以执行其他的操作,此时有两个独立的线程在并发运行 
    System.out.println("火箭发射前倒计时："); 
  } 
} 

#Thread-0(9)
#Thread-0(8)
#Thread-0(7)
#Thread-0(6)
#Thread-0(5)
#Thread-0(4)
#Thread-0(3)
#Thread-0(2)
#Thread-0(1)
#Thread-0(0)

#Thread-1(9)
#Thread-1(8)
#Thread-1(7)
#Thread-1(6)
#Thread-1(5)
#Thread-1(4)
#Thread-1(3)
#Thread-1(2)
#Thread-1(1)
#Thread-1(0)

package demo.thread; 
 
import java.util.concurrent.TimeUnit; 
 
public class DaemonDemo implements Runnable { 
  @Override 
  public void run() { 
    try { 
      while (true) { 
        Thread.sleep(1000); 
        System.out.println("#" + Thread.currentThread().getName()); 
      } 
    } catch (InterruptedException e) { 
      e.printStackTrace(); 
    } finally {// 后台线程不执行finally子句 
      System.out.println("finally "); 
    } 
  } 
 
  public static void main(String[] args) { 
    for (int i = 0; i < 10; i++) { 
      Thread daemon = new Thread(new DaemonDemo()); 
      // 必须在start之前设置为后台线程 
      daemon.setDaemon(true); 
      daemon.start(); 
    } 
    System.out.println("All daemons started"); 
    try { 
      TimeUnit.MILLISECONDS.sleep(1000); 
    } catch (InterruptedException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
    } 
  } 
} 

All daemons started
#Thread-2
#Thread-3
#Thread-1
#Thread-0
#Thread-9
#Thread-6
#Thread-8
#Thread-5
#Thread-7
#Thread-4