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Definition and Usage The implements keyword is used to implement an interface The interface keyword is used to declare a special type of class that only contains abstract methods To access the interface methods, the interface must be "implemented" (kinda like inherited) by another class with the implements keyword (instead of extends)A Java (TM) programming language keyword used in a class definition to specify that a class is not to be instantiated, but rather inherited by other classes An abstract class can have abstract methods that are not implemented in the abstract class, but in subclasses The "this" keyword in Java is a reference to the object of the current class Using it, you can refer a field, method or, constructor of a class Referring to a field using "this" keyword As discussed you can refer an instance filed/variable of a class from an instance method or, a constructor using "this" keyword What Is The Difference Between Static And ...