Java 线程 新线程顺序

Question

//Class PrintTask sleeps between0-5 seconds
import java.util.Random;
public class PrintTask implements Runnable{
private final int sleeptime;
private final String taskname;
private final static Random generator= new Random();

public PrintTask(String name)
{
    taskname=name;
    sleeptime=generator.nextInt(5000);

}

public void run()
{
    try 
    {
        System.out.printf("%s going to sleep for %d ms.\n", taskname,sleeptime);
        Thread.sleep(sleeptime);

    }
    catch(InterruptedException exception)
    {
        System.out.printf("%s %s\n", taskname,"terminated prematurely due to interruption");
    }
    System.out.printf("%s done sleeping\n",taskname);



}

}


//Creation and start of three threads 
import java.lang.Thread;
public class Threads {

public static void main(String[] args) {
    System.err.println("Creating threads");
    Thread  thread1=new Thread(new PrintTask("task1"));
    Thread  thread2=new Thread(new PrintTask("task2"));
    Thread  thread3=new Thread(new PrintTask("task3"));

    thread1.start();
    thread2.start();
    thread3.start();
    System.err.println("Tasks Started. Main Ends. \n");
}

}

一些结果

task2 going to sleep for 320 ms.
task1 going to sleep for 3054 ms.
task3 going to sleep for 1821 ms.
task2 done sleeping
task3 done sleeping
task1 done sleeping

task2 going to sleep for 1338 ms.
task3 going to sleep for 2825 ms.
task1 going to sleep for 3461 ms.
task2 done sleeping
task3 done sleeping
task1 done sleeping

我的问题是为什么消息“任务”将 hibernate **毫秒，没有以正确的顺序出现，如下所示:(有时它可能以“正确”的顺序出现)

task1 going to sleep for **** ms.
task2 going to sleep for **** ms.
task3 going to sleep for **** ms.

但它似乎以随机顺序出现。我是线程新手，所以请尽可能简单地回答我。谢谢!

Answer 1

您正在创建线程并将它们发送到某种调度程序。

这些线程由 JVM(或操作系统)启动，没有特殊的顺序。

更新:

正如@Braj在评论中提到的，您可以通过设置线程优先级来影响执行顺序。