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Java如何设置线程的优先级？

2024-04-16 11:30:04 460

线程总是以某种优先级运行，通常表示为1到10之间的数字（尽管在某些情况下范围小于10）。线程获得一个默认优先级，即创建它的执行线程的优先级。

但是，您也可以通过在Thread实例上调用setPriority()方法来直接设置线程的优先级。关于线程优先级，需要记住的一件事是，永远不要依赖于线程优先级，因为线程调度优先级行为不能得到保证。

package org.nhooo.example.lang;

public class ThreadPriority extends Thread {
    private String threadName;

    ThreadPriority(String threadName) {
        this.threadName = threadName;
    }

    @Override
    public void run() {
        System.out.println("Running [" + threadName + "]");
        for (int i = 1; i <= 10; i++) {
            System.out.println("[" + threadName + "] => " + i);

            try {
                Thread.sleep(500);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        ThreadPriority thread1 = new ThreadPriority("First");
        ThreadPriority thread2 = new ThreadPriority("Second");
        ThreadPriority thread3 = new ThreadPriority("Third");
        ThreadPriority thread4 = new ThreadPriority("Fourth");
        ThreadPriority thread5 = new ThreadPriority("Fifth");

        // 将thread1设置为最低优先级= 1
        thread1.setPriority(Thread.MIN_PRIORITY);

        // 将thread2设置为优先级2
        thread2.setPriority(2);

        // 将thread3设置为普通优先级= 5
        thread3.setPriority(Thread.NORM_PRIORITY);

        // 将thread4设置为优先级8
        thread4.setPriority(8);

        // 将thread5设置为最大优先级= 10
        thread5.setPriority(Thread.MAX_PRIORITY);

        thread1.start();
        thread2.start();
        thread3.start();
        thread4.start();
        thread5.start();
    }
}

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Java如何设置线程的优先级？

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