Class And Interface Difference In Java
Understanding the Difference between Classes and Interfaces in Java
Class And Interface Difference In Java
In Java, a class is a blueprint or template for creating objects that have common attributes and behaviors. Classes can be instantiated to create objects with specific characteristics defined by the class. On the other hand, an interface is like a contract that defines a set of methods that a class implementing the interface must provide. A class can implement multiple interfaces but can only extend one class. While classes can have both defined behavior and state, interfaces only define behavior; they do not have any implementation. Additionally, interfaces are used to achieve abstraction and achieve loose coupling between classes, allowing for flexibility and polymorphism in Java programming.
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1 - Classes in Java are used to define the blueprint for objects, while interfaces in Java are used to define a set of abstract methods that a class can implement.
2) A class can only extend one other class, but it can implement multiple interfaces in Java.
3) Classes can have member variables and method implementations, while interfaces can only have constant variables and method declarations.
4) Class members can have access modifiers such as public, private, protected, or default, while interface members are by default public and abstract.
5) Classes provide concrete implementations for methods, whereas interfaces provide a contract for classes to implement methods.
6) Classes can have constructors, but interfaces can't have constructors in Java.
7) A class can be instantiated to create objects, but interfaces cannot be instantiated on their own.
8) Classes can have both static and instance methods, while interfaces can only have static and default methods (with Java 8 onwards).
9) Classes can contain static blocks and instance initialization blocks, while interfaces cannot have blocks of code.
10) In Java, a class can be abstract or non abstract, but an interface is inherently abstract and does not need the ‘abstract’ keyword for its methods.
Based on the differences explained above, a training program for students could cover topics such as inheritance, polymorphism, abstraction, and interface implementations in Java, demonstrating the practical applications of both classes and interfaces in real world programming scenarios.
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