Java线程操作的常见方法【线程名称获取、设置、线程启动判断等】

public class GetNameThreadDemo extends Thread
{
  public void run()
  {
   for( int i = 0; i < 5; ++i )
   {
     printMsg();
     try
     {
      Thread.sleep(1000);    // 睡眠1秒
     }
     catch( InterruptedException e )
     {
      e.printStackTrace();
     }
   }
  }
  public void printMsg()
  {
   // 获得运行此代码的线程的引用
   Thread t = Thread.currentThread();
   String name = t.getName();
   System.out.println( "name = " + name );
  }
  public static void main( String[] args )
  {
   GetNameThreadDemo t1 = new GetNameThreadDemo();
   t1.start();
   for( int i = 0; i < 5; ++i )
   {
     t1.printMsg();
     try
     {
      Thread.sleep(1000);    // 睡眠1秒
     }
     catch( InterruptedException e )
     {
      e.printStackTrace();
     }
   }
  }
}

public class GetSetNameThreadDemo implements Runnable
{
  public void run( )
  {
    Thread temp = Thread.currentThread( );//获取执行这条语句的线程实例
    System.out.println("执行这条语句的线程名字:" + temp.getName( ));
  }
  public static void main(String[] args)
  {
    Thread t = new Thread(new GetSetNameThreadDemo( ));
    t.setName("线程_范例演示");
    t.start();
  }
}

public class StartThreadDemo extends Thread
{
  public void run()
  {
   for( int i = 0; i < 5; ++i )
   {
     printMsg();
   }
  }
  public void printMsg()
  {
   // 获得运行此代码的线程的引用
   Thread t = Thread.currentThread();
   String name = t.getName();
   System.out.println( "name = " + name );
  }
  public static void main( String[] args )
  {
   StartThreadDemo t = new StartThreadDemo();
   t.setName( "test Thread" );
   System.out.println( "调用start()方法之前 , t.isAlive() = " + t.isAlive() );
   t.start();
   System.out.println( "刚调用start()方法时 , t.isAlive() = " + t.isAlive() );
   for( int i = 0; i < 5; ++i )
   {
     t.printMsg();
   }
   // 下面语句的输出结果是不固定的，有时输出false，有时输出true
   System.out.println( "main()方法结束时 , t.isAlive() = " + t.isAlive() );
  }
}