• Java 实例 - 线程优先级设置

    以下实例演示了如何通过setPriority() 方法来设置线程的优先级:

    SimplePriorities.java 文件

    public class SimplePriorities extends Thread { private int countDown = 5; private volatile double d = 0; public SimplePriorities(int priority) { setPriority(priority); start(); } public String toString() { return super.toString() + ": " + countDown; } public void run() { while(true) { for(int i = 1; i < 100000; i++) d = d + (Math.PI + Math.E) / (double)i; System.out.println(this); if(--countDown == 0) return; } } public static void main(String[] args) { new SimplePriorities(Thread.MAX_PRIORITY); for(int i = 0; i < 5; i++) new SimplePriorities(Thread.MIN_PRIORITY); } }

    以上代码运行输出结果为:

    Thread[Thread-1,1,main]: 5
    Thread[Thread-2,1,main]: 5
    Thread[Thread-3,1,main]: 5
    Thread[Thread-0,10,main]: 5
    Thread[Thread-3,1,main]: 4
    Thread[Thread-0,10,main]: 4
    Thread[Thread-1,1,main]: 4
    Thread[Thread-5,1,main]: 5
    Thread[Thread-4,1,main]: 5
    Thread[Thread-2,1,main]: 4
    Thread[Thread-0,10,main]: 3
    Thread[Thread-1,1,main]: 3
    Thread[Thread-4,1,main]: 4
    Thread[Thread-2,1,main]: 3
    ……