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 vote176 views1 answer
How to add music to java
Java
0 vote204 views1 answer
Fibonacci series in java using recursion
Java
1 vote167 views1 answer
Add value with n variable with Arraylist in java
Java
0 vote189 views1 answer
Key caracter from code java
Java
0 vote188 views1 answer
Explain java coding standards for classes
Java
1 vote181 views1 answer
Count vowels in a string java
Java
0 vote195 views1 answer
Fakultät in java
Java
2 votes175 views1 answer
Java random uuid
Java
0 vote205 views1 answer
Free pearson uk textbooks
Java
0 vote188 views1 answer
Put arraylist in hashtable java
Java