class PriorityTest {
	public static void main(String args[]) {
		SubThread Obj1 = new SubThread("John");
		/*將Obj1的優先級設置為最低*/
		Obj1.setPriority(Thread.MIN_PRIORITY);
		/*啟動Obj1線程*/
		Obj1.start();	
		/*聲明線程對象Obj2,優先級為缺省優先級*/
		SubThread Obj2 = new SubThread("Tom");
		/*啟動Obj2線程*/
		Obj2.start();
		/*聲明線程對象Obj3*/
		SubThread Obj3 = new SubThread("Jennifer");
		/*啟動Obj3線程*/
		Obj3.start();
		/*生成線程對象Obj4*/
		SubThread Obj4 = new SubThread("May");
		/*將Obj4的優先級設置為最高*/
		Obj4.setPriority(Thread.MAX_PRIORITY);
		/*啟動Obj4線程*/
		Obj4.start();
	}
}
/*下面是SubThread類的定義，該類是Thread類的子類*/
class SubThread extends Thread {
	int num = 33;
	SubThread(String str) {
		super(str);
	}
	/*run()方法輸出線程運行信息*/
	public void run() {
		/*輸出提示信息*/
		System.out.println(getName() + " begins running");
		for(int i = 0; i < num; i++) {
			/*輸出當前時刻正在運行的線程*/
			System.out.println("Step " + i + ": " + getName() + " ，priority ：" + getPriority());
		}
		/*顯示運行完的線程名稱*/
		System.out.println(getName() + " finished");
	}
}