What Is Difference Between Extends And Implements In Java
Understanding the Difference Between "extends" and "implements" in Java
What Is Difference Between Extends And Implements In Java
In Java, the “extends” keyword is used to create a subclass which inherits all the properties and methods of a parent class, allowing for code reuse and establishing an “is-a” relationship between the two classes. On the other hand, the “implements” keyword is used to declare that a class implements a particular interface, which enforces the implementation of all the abstract methods defined in the interface. Therefore, while “extends” is used for class inheritance, “implements” is used for interface implementation in Java.
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1 - The “extends” keyword in Java is used to establish an inheritance relationship between classes. When a class extends another class, it inherits all the non private fields and methods of the parent class. This allows for code reuse and supports the concept of the “is a” relationship. On the other hand, the “implements” keyword is used to indicate that a class implements an interface, which means that the class must provide implementations for all the methods declared in the interface.
2) In the case of inheritance using “extends”, a subclass can only extend one class, as Java supports single inheritance. However, a class can implement multiple interfaces by using the “implements” keyword, providing a way to achieve multiple inheritance of type.
3) When a class extends another class, it automatically inherits both the behavior and structure of the parent class. This allows for method overriding, where the subclass can provide its own implementation of methods inherited from the parent class. Conversely, when a class implements an interface, it must implement all the methods declared in the interface, without providing any default implementations.
4) The “extends” keyword is used for extending a class hierarchy, enabling the creation of parent child relationships. In contrast, the “implements” keyword is commonly used for implementing contracts defined by interfaces, allowing for polymorphism and flexibility in design.
5) Using “extends” signifies an “is a” relationship, where the subclass is a more specialized version of the superclass. On the other hand, using “implements” indicates that a class promises to provide specific functionality defined in the interface, enforcing a contract without specifying the internal implementation details.
6) In summary, the “extends” keyword is used for inheriting classes, allowing for code reuse and inheritance of behavior, while the “implements” keyword is used to implement interfaces, defining a contract for classes to follow. Understanding the differences between these keywords is crucial for designing robust and maintainable Java applications.
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