Java 示例 - 获得优先级

• 

  问题描述

  如何获取运行线程的优先级？
• 

  解决方案

  以下示例使用 setPriority() 方法打印正在运行的线程的优先级。

  
  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);
     }
  } 
  

• 

  结果

  上面的代码示例将产生以下结果。

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