如何通过线程访问 Runnable 对象? [英] How to access a Runnable object by Thread?

问题描述

可能重复:need-help-returning-object-in-线程运行方法

你好.我有一个实现 runnable 的类，我有一个 List，用于存储用该类的不同对象实例化的线程.给定运行它们的线程对象，如何访问底层对象的属性?下面是一个例子:

Hello. I have a class implementing runnable and I have a List, storing Threads instantiated with different objects of that class. How can I access properties of underlying objects given the thread object running them? Here is an example:

public class SO {
    public static class TestRunnable implements Runnable {
        public String foo = "hello";

        public void run() {
            foo = "world";
        }
    }

    public static void main(String[] args) {
        Thread t = new Thread(new TestRunnable());
        t.start();
        //How can I get the value of `foo` here?
    }
}

推荐答案

我在 java.lang.Thread 文档.

I don't see any way to do it in the java.lang.Thread docs.

我最好的答案是，您可能应该使用 List 而不是(或除此之外)List.或者你可能想要某种 map 结构，以便您可以从线程访问 Runnable.(例如，java.util.HashMap)

My best answer, then, is that you probably should be using List<Runnable> instead of (or in addition to) List<Thread>. Or perhaps you want some sort of map structure so that you can access the Runnable from the Thread. (For example, java.util.HashMap<java.lang.Thread, java.lang.Runnable>)

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