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

2 votes220 views1 answer
Printing a treeset java
Java
0 vote264 views2 answers
Java sha256 hex digest
Java
1 vote254 views1 answer
Java \n
Java
11 votes227 views2 answers
Css div click through
Java
5 votes238 views3 answers
Random string generator java
Java
0 vote256 views1 answer
Mergesort parallelization using Spark
Java
0 vote267 views1 answer
Heap sort java
Java
0 vote255 views1 answer
Java switch display panel
Java
4 votes334 views1 answer
Dependency for spring security
Java Spring
0 vote261 views1 answer
Java opengl get fps
Java