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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：

  1. /*
  2.  author by shouce.ren
  3.  SimplePriorities.java
  4.  */
  5.  
  6. public class SimplePriorities extends Thread {
  7.    private int countDown = 5;
  8.    private volatile double d = 0; 
  9.    public SimplePriorities(int priority) {
  10.       setPriority(priority);
  11.       start();
  12.    }
  13.    public String toString() {
  14.       return super.toString() + ": " + countDown;
  15.    }
  16.    public void run() {
  17.       while(true) {
  18.          for(int i = 1; i < 100000; i++)
  19.          d = d + (Math.PI + Math.E) / (double)i;
  20.          System.out.println(this);
  21.          if(--countDown == 0) return;
  22.       }
  23.    }
  24.    public static void main(String[] args) {
  25.       new SimplePriorities(Thread.MAX_PRIORITY);
  26.       for(int i = 0; i < 5; i++)
  27.       new SimplePriorities(Thread.MIN_PRIORITY);
  28.    }
  29. }

以上代码运行输出结果为：

  1. Thread[Thread-1,1,main]: 5
  2. Thread[Thread-2,1,main]: 5
  3. Thread[Thread-3,1,main]: 5
  4. Thread[Thread-0,10,main]: 5
  5. Thread[Thread-3,1,main]: 4
  6. Thread[Thread-0,10,main]: 4
  7. Thread[Thread-1,1,main]: 4
  8. Thread[Thread-5,1,main]: 5
  9. Thread[Thread-4,1,main]: 5
  10. Thread[Thread-2,1,main]: 4
  11. Thread[Thread-0,10,main]: 3
  12. Thread[Thread-1,1,main]: 3
  13. Thread[Thread-4,1,main]: 4
  14. Thread[Thread-2,1,main]: 3
  15. ……