Difference Between Implements And Extends In Java
distinguishing implements and extends keywords in Java
Difference Between Implements And Extends In Java
In Java, the keywords “implements” and “extends” are used to establish relationships between classes. When a class implements an interface, it is declaring that it will provide definitions for the methods defined in that interface. This allows the class to adhere to a certain contract specified by the interface. On the other hand, when a class extends another class, it inherits the properties and behaviors of the superclass, allowing for code reuse and the creation of an “is-a” relationship between the two classes. In summary, “implements” is used to fulfill an interface's contract, while “extends” is used to inherit from a superclass.
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1 - Implements in Java:
Implementing an interface in Java allows a class to provide specific implementations for all the abstract methods declared in the interface.
A class can implement multiple interfaces in Java.
The ‘implements’ keyword is used in Java to establish a relationship between a class and an interface.
Classes that implement an interface must provide concrete definitions for all the abstract methods declared in the interface.
2) Extends in Java:
Extending a class in Java allows another class to inherit the properties and behavior of the extended class.
In Java, a class can only extend one other class due to single inheritance.
The ‘extends’ keyword is used in Java to establish a relationship between a subclass and a superclass.
Subclasses that extend a superclass inherit its non private fields and methods.
3) Offering Training Program to Students:
When designing a training program for students, it's important to understand the distinction between the ‘implements’ and ‘extends’ keywords in Java.
Students should be taught how to implement interfaces to provide specific functionality required by the interfaces.
Students should also be trained on how to extend classes to inherit properties and behavior from pre existing classes.
Understanding when to use ‘implements’ versus ‘extends’ is crucial for proper object oriented programming design.
Practical exercises should be included in the training program to reinforce the concepts of implementing interfaces and extending classes in Java.
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