Java線程優先級測試

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//注意，優先級並不能確保運行的次序，僅僅是看誰能佔有更多的CPU時間片
class Priority implements Runnable{
    Thread t1,t2,t3,notify;

    Priority(){
        t1=new Thread(this);
        t1.setPriority(5);
        t2=new Thread(this);
        t2.setPriority(1);
        t3=new Thread(this);
        t3.setPriority(10);
        notify=new Thread(this);
    }

    public void notice(){
        synchronized(this){
            notify();
        }
    }

    public synchronized void run(){
        if(Thread.currentThread()==t1){
            System.out.println("t1");
            try{
                synchronized(this){
                    wait(); //交出鎖並阻塞當前線程，即t1線程
                }
            }
            catch(InterruptedException th1){}
            finally{}
            System.out.println("t1 back!");
        }
        if(Thread.currentThread()==t2){
            System.out.println("t2");
            try{
                synchronized(this){
                    wait();
                }
            }
            catch(InterruptedException th2){}
            finally{}
            System.out.println("t2 back!");
        }
        if(Thread.currentThread()==t3){
            System.out.println("t3");
            try{
                synchronized(this){
                    wait();
                }
            }
            catch(InterruptedException th3){}
            finally{}
            System.out.println("t3 back!");
        }
        if(Thread.currentThread()==notify){
            System.out.println("notify");
            try{
                synchronized(this){
                    this.notifyAll();
                }
            }
            //catch(InterruptedException th3){}
            finally{}
        }
    }

    public static void main(String args[]){
            Priority t=new Priority();
            t.t1.start();
            t.t2.start();
            t.t3.start();


            try{
                {
                    Thread.sleep(2000);
                }
            }
            catch(InterruptedException th3){}
            finally{}
            //t.notice();
            t.notify.start();

            //System.exit(0);
    }
}