我如何在我的 java 代码上使用回调方法？

Question

public class DowloadEngine implements Runnable {

public DowloadEngine(CallBack c) {
    callback = c;
}

public interface CallBack {
    public void processDone(String message);
}

private final CallBack callback;

@Override
public void run() {
    try {
        Thread.sleep(4000);
    } catch (InterruptedException e) {}
    callback.processDone("'CallBack' func is called");
}
}

这里是我的主要class

public class GUI implements DowloadEngine.CallBack{

public static void main(String[] args){

    Thread thread = new Thread(new DowloadEngine(this));// Error :Make main not static!!
    thread.start();

    //wait a little to see the result
    Scanner scan = new Scanner(System.in);
    scan.nextLine();
    //wait a little to see the result
}

@Override
public void processDone(String message) {
    //code ...
    //code ...
    //code ...
    System.out.println(message);
}
}

我想通过回调方法完成主要 class 上的所有工作，但我不理解这些方法。它是如何工作的？我怎样才能将它们一起使用？

Answer 1

变化：

Thread thread = new Thread(new DowloadEngine(this)); 至

Thread thread = new Thread(new DowloadEngine(new GUI()));

我如何在我的 java 代码上使用回调方法？

How can i use callback method on my java code?

java

interface

callback

runnable