Question

public class CustomThread extends Thread {
    public void run(){
        IntStream.range(0, 3).parallel().forEachOrdered(x -> System.out.println("Child Thread :- "+Thread.currentThread().getName()+"-"+x));
    }
}

public class CustomThreadDemo {
    public static void main(String[] args) {
        CustomThread customThread = new CustomThread();     
        customThread.setPriority(Thread.MIN_PRIORITY);
        customThread.setName("CustomThread");
        customThread.start();


        CustomThread customThread1 = new CustomThread();        
        customThread1.setPriority(Thread.MAX_PRIORITY);
        customThread1.setName("CustomThread1");
        customThread1.start();

        IntStream.range(0, 3).parallel().forEachOrdered(x ->                       
                System.out.println("Parent Thread :- "+x));


    }
}

默认情况下，两个线程具有相同的优先级（5），这就是为什么我们不能期望正确的排序结果，但是如果我们设置子线程优先级 - Thread-Scheduler将如何执行。

Answer 1

虽然调度程序应该优先选择具有更高优先级的线程，但是依赖于任何行为都不能保存。使用synchronized块和其他机制来确保线程安全，如

中所定义

https://docs.oracle.com/javase/tutorial/essential/concurrency/index.html

Thread调度程序如何执行此代码？

1 个答案: