class ThreadDemo1 extends Thread
{
    public ThreadDemo1(){
      
    }
    public ThreadDemo1( String name ){
       super( name );
    }
    
    public void run(){
       int i = 0;
       while(i < 30){
          i++;
          System.out.println( this.getName() + " "+ " : i = " + i);
          System.out.println( Thread.currentThread().getName() + " "+ " : i = " + i);
          System.out.println( Thread.currentThread() == this );
          System.out.println( "getId()" + " "+ " : id = " + super.getId() );
          System.out.println( "getPriority()" + " "+ " : Priority = " + super.getPriority() );
       }
    }
}
class Demo3 
{
    public static void main(String[] args) 
    {
        ThreadDemo1 th1 = new ThreadDemo1("线程1");
        ThreadDemo1 th2 = new ThreadDemo1("线程2");
        // 设置线程名
        th1.setName( "th1" );
        th2.setName( "th2" );
        // 设置线程优先级  1 ~ 10
        th1.setPriority( 10 ); 
        th2.setPriority( 7 ); 
        // 查看SUN定义的线程优先级范围
        System.out.println("max : " + Thread.MAX_PRIORITY );
        System.out.println("min : " + Thread.MIN_PRIORITY );
        System.out.println("nor : " + Thread.NORM_PRIORITY );
        th1.start();
        th2.start();
        System.out.println("Hello World!");
    }
}