threadprioritydemo.java

在java中线程的优先级是用数字1-10来表示的

public class ThreadPriorityDemo extends Thread
{
	public ThreadPriorityDemo(String msg){
		super(msg);
		System.out.println("Thread " + msg + " is created");
	}

	public void run(){
		System.out.println(getName() + "\tstart running");
		for(int i=1; i<3; i++)
			System.out.println(toString());
		System.out.println(getName() + " end!");
	}

	public String toString(){
		return(getName() + " priority :" + getPriority());//输出当前线程名及其优先级
	}

	public static void main(String []args){
		ThreadPriorityDemo t1 = new ThreadPriorityDemo("Thread1");//创建线程
		ThreadPriorityDemo t2 = new ThreadPriorityDemo("Thread2");
		ThreadPriorityDemo t3 = new ThreadPriorityDemo("Thread3");
		ThreadPriorityDemo t4 = new ThreadPriorityDemo("Thread4");
		t1.start();		//启动线程
		t2.start();
		t3.start();
		t4.start();
		System.out.print("reset the priority.......\n");
		t1.setPriority(MIN_PRIORITY);	//重新设定线程的优先级
		t2.setPriority(MAX_PRIORITY);	//线程的默认优先级是5
		t4.setPriority(8);
	}
};