Difference Between Extends And Implements In Java
distinguishing between extends and implements in Java
Difference Between Extends And Implements In Java
In Java, the “extends” keyword is used to establish a relationship between a subclass and a superclass, where the subclass inherits the properties and behaviors of the superclass. This enables code reuse and promotes the concept of inheritance. On the other hand, the “implements” keyword is used to indicate that a class implements a particular interface, which defines a set of methods that the implementing class must provide. While inheritance allows subclasses to access and modify the superclass members, interfaces provide a way to ensure that classes conform to a specific structure without specifying the implementation details. This allows for better code organization and facilitates the development of loosely coupled and easily maintainable code.
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1 - When offering a training program to students, it's important to explain the difference between ‘extends’ and ‘implements’ in Java to help them understand the concept of inheritance and interface implementation.
2) ‘extends’ is used for inheritance in Java, where a subclass can inherit fields and methods from a superclass. This allows for code reusability and supports the concept of IS A relationship.
3) In contrast, ‘implements’ is used to implement an interface in Java. An interface defines a contract that a class must adhere to by implementing its methods. This allows for achieving multiple inheritances through interfaces.
4) A class can extend only one superclass using ‘extends’ keyword, but it can implement multiple interfaces using ‘implements’ keyword.
5) When using ‘extends’, the subclass inherits all non private members (fields and methods) of the superclass. However, when using ‘implements’, the class must provide concrete implementations for all methods declared in the interface.
6) Inheritance with ‘extends’ creates an ‘is a’ relationship between subclass and superclass, meaning a subclass is a type of superclass. Interface implementation with ‘implements’ establishes a ‘can do’ relationship, where a class can do certain actions specified by the interface.
7) ‘extends’ keyword is used for extending classes, while ‘implements’ keyword is used for implementing interfaces in Java.
8) In Java, a class can extend another class using ‘extends’ keyword to inherit the properties and behaviors of the superclass, while it can implement one or more interfaces using ‘implements’ keyword to define a contract for the class to follow.
9) It is also worth mentioning that the ‘extends’ keyword is used for creating a subclass of a class, while the ‘implements’ keyword is used to indicate that a class is following the requirements of an interface.
10) By understanding the differences between ‘extends’ and ‘implements’, students can effectively design and implement class hierarchies and interfaces in their Java programs to enhance code structure and reusability.
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