What Is Difference Between Class And Interface In Java
Understanding the Difference Between Class and Interface in Java
What Is Difference Between Class And Interface In Java
In Java, a class is a blueprint for creating objects that define the properties and behaviors of those objects. It serves as a template that can be used to create multiple instances of that class. On the other hand, an interface in Java is a reference type that can contain only constants, method signatures, and default methods. A class can implement one or more interfaces, inheriting the abstract method signatures defined in the interface. While a class can have attributes and method implementations, an interface only defines the signatures of methods that implementing classes must provide. Essentially, a class defines what an object is, while an interface defines what an object can do.
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1 - In Java, a class is a blueprint for creating objects, while an interface is a reference type that can contain only constants, method signatures, default methods, static methods, and nested types.
2) Classes can have attributes, constructors, and methods with defined behavior, while interfaces can only have method signatures without method bodies.
3) A class can implement multiple interfaces, but it can extend only one class. This allows for achieving multiple inheritances through interfaces in Java.
4) Classes can be instantiated to create objects, but interfaces cannot be instantiated on their own. Instead, a class that implements an interface must provide implementations for all the methods defined in the interface.
5) Classes can have access specifiers like public, private, protected, etc., to define the visibility and scope of variables and methods, whereas interfaces are inherently public and abstract.
6) Classes can have fields that store data, while interfaces can have fields, but they are implicitly static and final (constants).
7) Methods within a class can have different access levels (public, private, protected), but all methods declared in an interface are public by default.
8) Inheritance of classes is accomplished using the ‘extends’ keyword, while a class implements an interface using the ‘implements’ keyword.
9) Classes can have constructors to initialize objects, but interfaces cannot have constructors because they cannot be instantiated.
10) Classes can have both static and instance methods, while interfaces can only have static methods or default methods (methods with default implementations).
11) Interfaces are used for achieving abstraction and defining a contract that classes must adhere to, promoting loose coupling between classes, and allowing for flexibility in design and implementation.
12) Classes focus on implementation details and defining the state and behavior of objects, while interfaces focus on defining a set of methods that a class must implement without specifying how they are implemented.
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