等到线程优雅地完成 [英] Wait until thread finishes gracefully

问题描述

我有这个代码:

public class JsoupParser {      
    ArrayList<CompanyInfo> arr = new ArrayList<CompanyInfo>();

    public JsoupParser() {}

    public ArrayList<CompanyInfo> parse(final String link) throws IOException {
        Runnable runnable = new Runnable() {
            public void run() {
                // Here I do some operations and then assign some value
                // to my `arr` ArrayList
            }
        };
        new Thread(runnable).start();

        return arr; // error here, as expected      
    }
}

系统立即返回arr，此时为null.

System immediately returns arr, which at that point is null.

怎样才能在Thread结束后返回arr?如何通知我 Thread 已完成?

How can I return arr only after Thread finishes? How can I be informed, that Thread has finished?

推荐答案

如何在线程完成后才返回 arr?我怎么会通知，线程已完成?

How can I return arr only after Thread finishes? How can I be informed, that Thread has finished?

Thread parseThread = new Thread(runnable).start();

parseThread.join();

return arr;

您的问题有字面的答案，但 zmbq 的答案更适合您的需求.

There's the literal answer to your question but zmbq's answer is more fitting for what you're after.

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