当另一个线程中发生某些事情时，是否从主线程获取数据? [英] Get data from main thread when something happens in another?

问题描述

目前，我有一个运行套接字的线程侦听连接.收到连接后，它需要上传在主线程中收集的数据(即从主线程中获取数据).但是，我传递了一个Object的实例，但从未使用等待连接时收集的数据对其进行更新.

Currently I have a Thread running a Socket listening for connections. When it receives a connection, it needs to upload data gathered in the main thread (i.e. grab data from main thread). However I pass an instance of the Object, but it's never updated with the data that's collected while waiting for a connection.

是否有适当的方法来做到这一点?我已经四处搜寻，似乎找不到具体答案.

Is there a proper way to do this? I've googled around and can't seem to find a concrete answer.

有人能指出我正确的方向吗?

Could someone point me in the right direction?

希望这是有道理的，但我将尝试通过示例进行解释.

Hopefully this makes sense, but i'll try to explain more with an examples.

class MainThread {
    private void MainThread() {
        SomeObj obj = new SomeObj("DATA Needed");

        SecondThread second = new SecondThread(obj);
        second.start();
    }
}

class SecondThread extends Thread {
    SomeObj obj;

    public void SecondThread(Object obj) {
    this.obj = obj;
    }
    public void run() {

    //Listening for connection
    //Connection get!
    //Get updated data (Object obj) from main thread.
    //Upload
    }
}

感谢您能给我任何帮助.如果我要完全解决这个问题，请告诉我！我宁愿学习并获得答案，而不是仅仅获得答案.

I appreciate any help you can give me. Please let me know if I am approaching this completely wrong! I would rather learn AND get answers than just get answers.

非常感谢！

推荐答案

收到连接后，它需要上传在主线程中收集的数据(即从主线程中获取数据).

When it receives a connection, it needs to upload data gathered in the main thread (i.e. grab data from main thread).

这没有意义，因为您没有从 Threads 获取信息，而是获得了信息并与 Objects 进行了通信.那是很大的不同.您需要将需要信息的对象的实例传递到需要此信息的第二个对象中，或者作为其构造函数中的参数.然后，您将使用该实例在SecondThread类中设置一个字段，然后可以在其上调用方法.

This doesn't make sense as you don't get information from Threads, you get information and communicate with Objects. That's a big difference. You need to pass an instance of the object that you need information from into the second object that needs this information, perhaps as a parameter in its constructor. Then you would set a field in your SecondThread class with this instance and you can call methods on it.

即

class MainThread {
    private void MainThread() {
        SomeType obj = new SomeType("DATA Needed");

        SecondThread second = new SecondThread(obj);
        second.start();
    }
}

class SecondThread extends Thread {
    SomeType obj;

    public SecondThread(SomeType obj) {
       this.obj = obj;
    }
    public void run() {
      // can call methods on obj here
    }
}

希望您实际上并没有使用Object类型，而是使用了一种更具体的对象类型，对吧?

Hopefully you're not actually using an Object type but rather a much more specific type of object, right?

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