CODEWITHSUNDEEP
javaoopdesign-patterns
cdxf
cdxf

Reputation: 5648

Call parent method in association relationship

Sorry for my confusing title, but i don't know any better. I have two classes: My classes

The first class (called MainClass) create a GUI that contain a Socket. When any data is received from Socket Class, onReceived() will be called. So in this onReceived() method, i want a way to send a message back to the MainClass so that MainClass can know position has change and call setPostion().

So what is the properly way to do this (if necessary, correct my model for better practice). Thanks

Upvotes: 1

Views: 198

Answers (1)

danizmax
danizmax

Reputation: 2456

You can do the following;

Define listener interface:

public interface MyListener(){

    public void doNotify(String message);

}

The Socket class (has a methot to add listeners that are notified on onRecieve()):

public class SocketClass {

    private List<MyListener> listeners = new ArrayList<MyListener>();

    public void addListener(MyListener listener) {
        listeners.add(listener);
    }

    public void onRecieve(){
        /* your code*/
        for (MyListener l : listeners)
            l.doNotify("Socket has recieved something ;P");
    }

}

The Gui class has a method that passes on the listener:

public class GuiClass() {

    SocketClass s = new SocketClass();

    public void addListener(MyListener listener) {
        s.addListener(listener);
    }

}

And finally the main class (implements the listener interface and adds itselef to GuiClass as listener):

public class MainClass implements MyListener {

    public static void main(String[] args) 
    {
        GuiClass g =  new GuiClass();
        g.addListener(this);

    }

    public void doNotify(String message) {
        System.out.println(message);
        setPostition();
    }

    private void setPosition()
        /* your code here */
    }

}

A good example is also THIS.

Good luck and Regards

Upvotes: 1

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