A simple sample callback in Java

interface Callback{
    void call();

class A implements Callback{
    private B b;

    public A(){
        b = new B();

    // Implementation of the callback interface
    public void call(){


public class B
    private Callback callbackoNotify;

    public class registerCallback(Callback callback)
        callbackoNotify = callback;

    public void doTask()
        //do some stuff...

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