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

Hello。我有一个类实现runnable，我有一个List，存储Threads实例化与该类的不同对象。给定线程对象运行它们时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

I没有看到任何方法在 java.lang.Thread docs。

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

我最好的答案是，应该使用 List< Runnable> 而不是（或除了） List< Thread> 。或者，您可能需要某种地图 a>结构，以便您可以从Thread访问Runnable。 （例如， java.util.HashMap< java.lang.Thread，java.lang.Runnable> ）

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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