Object-oriented programming in Java.
If you desire a particular method to be present in a class and actual methodís implementation be determined by the help of a child class then you must be declaring methods which are present in parent class, as an abstract.
A method to be declard as an abstract, abstract keyword is being used. There is no method body in abstract method but do have a method signature.
Signatures of abstract methods are followed by semicolon and they have no definition: Java Code: public abstract