Java如何檢視執行緒的優先順序？

在Java程式設計中，如何檢視執行緒的優先順序？

以下範例演示如何使用Thread類的getPriority()方法檢查執行緒的優先順序。

package com.yiibai;

public class ThreadPriorityLevel 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());
    }
}

上述程式碼範例將產生以下結果 -

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