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

0 vote320 views1 answer
Java run jar with args
Java
1 vote300 views1 answer
Radio button in java
Java
0 vote296 views1 answer
WriteToFileAsync java
Java
1 vote337 views2 answers
Javafx every second
Java
0 vote319 views1 answer
Common exceptions in java
Java
0 vote327 views1 answer
Recyclerview scramble after scrolling
Java
0 vote306 views1 answer
Private access modifiers
Java
0 vote319 views1 answer
Lists - removing
Java
0 vote321 views2 answers
Java class name to string
Java
0 vote317 views1 answer
Double if statement java
Java