java - 线程行为:Java Beginner

Question

我尝试编写一个使用线程的程序，但无法理解 o/p。我有 2 个线程:s 和 t。但我看不到线程 s 正在工作。

有人可以向我解释一下这种行为吗？谢谢

我的代码:

public class Bground implements Runnable
{
    Thread t,s;

    Bground()
    {
        t = new Thread(this,"first thread");
        s = new Thread(this,"second thread");

        s.start();
        t.start();
    }

    public void run()
    {
        System.out.println("inside run" + t.getName());
        try
        {
            for (int i = 0; i < 5; i++)
            {
                System.out.println("In child thread" + i);
            }
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }

    public static void main(String argv[])
    {
        Bground b = new Bground();
        try
        {                
            for (int i = 0; i < 5; i++)
            {
                System.out.println("In main thread" + i);
                Thread.sleep(1);
            }
        }
        catch(InterruptedException e)
        {
            e.printStackTrace();
        }
    }
}

操作:

c:\Program Files\Java\jdk1.6.0_23\bin>java Bground

In main thread0
inside runfirst thread
inside runfirst thread
In child thread0
In child thread1
In child thread2
In main thread1
In child thread3
In child thread0
In child thread1
In child thread2
In child thread3
In child thread4
In main thread2
In child thread4
In main thread3
In main thread4

Answer 1

您期望打印出什么内容:

System.out.println("inside run " + t.getName());

您无法在此处获取当前线程的名称，但您始终会获取 t-Thread 的名称。要修复 - 获取当前线程并对其调用getName()。