Java 示例 - 检查线程

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  问题描述

  如何检查线程的优先级？
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  解决方案

  以下示例演示如何使用线程的 getPriority() 方法检查线程的优先级。

  
  public class Main extends Object {
     private static Runnable makeRunnable() {
        Runnable r = new Runnable() {
           public void run() {
              for (int i = 0; i < 5; i++) {
                 Thread t = Thread.currentThread();
                 System.out.println("in run() - priority = " + t.getPriority()+ ", name = " + t.getName());
                 try {
                    Thread.sleep(2000);
                 } catch (InterruptedException x) {}
              }
           }
        };
        return r;
     }
     public static void main(String[] args) {
        System.out.println(
           "in main() - Thread.currentThread(). getPriority() = " + Thread.currentThread().getPriority());
        System.out.println(
           "in main() - Thread.currentThread().getName() = "+ Thread.currentThread().getName());
        
        Thread threadA = new Thread(makeRunnable(), "threadA");
        threadA.start();
        try {
           Thread.sleep(3000);
        } catch (InterruptedException x) {}
        System.out.println("in main() - threadA.getPriority() = " + threadA.getPriority());
     }
  }
  

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  结果

  上面的代码示例将产生以下结果。

  
  in main() - Thread.currentThread().getPriority() = 5
  in main() - Thread.currentThread().getName() = main
  in run() - priority = 5, name = threadA
  in run() - priority = 5, name = threadA
  in main() - threadA.getPriority() = 5
  in run() - priority = 5, name = threadA
  in run() - priority = 5, name = threadA
  in run() - priority = 5, name = threadA