Java callbacks

interface CallBack {                   //declare an interface with the callback methods, so you can use on more than one class and just refer to the interface
    void methodToCallBack();
}

class CallBackImpl implements CallBack {          //class that implements the method to callback defined in the interface
    public void methodToCallBack() {
        System.out.println("I've been called back");
    }
}

class Caller {

    public void register(CallBack callback) {
        callback.methodToCallBack();
    }

    public static void main(String[] args) {
        Caller caller = new Caller();
        CallBack callBack = new CallBackImpl();       //because of the interface, the type is Callback even thought the new instance is the CallBackImpl class. This alows to pass different types of classes that have the implementation of CallBack interface
        caller.register(callBack);
    }
}

Source: stackoverflow.com

Similar codes

3 votes124 views3 answers
Java code example
Java
0 vote143 views1 answer
Mint menu disapeared
Java
0 vote129 views1 answer
Java button with jpg image
Java
0 vote160 views1 answer
Java startswith regex
Java
0 vote107 views1 answer
How many of a char in a string java
Java
1 vote133 views1 answer
Jaxb exclude field
Java
0 vote137 views1 answer
Hide tablayout tab android
Java
1 vote131 views1 answer
Kotlin enable and disable parents view children
Java
0 vote140 views1 answer
Pvector maximum dimension
Java
1 vote121 views1 answer
Import android.support.v7.app.ActionBarActivity;
Java