Top 5 Object oriented programming questions in Java

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Top 5 Object-oriented programming questions in Java with answers

What is an object in Java?
In Java, an object is an instance of a class that encapsulates data and behavior. It is created using the new keyword and can access the methods and variables defined in its class.

What is inheritance in Java?
Inheritance is a mechanism in Java where a new class is derived from an existing class. The new class inherits the properties and methods of the existing class and can also add its own unique properties and methods. In Java, inheritance is achieved using the extends keyword.

What is polymorphism in Java?
Polymorphism is the ability of an object to take on many forms. In Java, polymorphism is achieved through method overriding and method overloading. Method overriding occurs when a subclass provides its own implementation of a method that is already defined in its parent class, while method overloading occurs when a class has multiple methods with the same name but different parameters.

What is an interface in Java?
In Java, an interface is a collection of abstract methods that defines a contract for a set of behaviors. Classes can implement an interface to provide their own implementation of the methods defined in the interface. Interfaces are used to achieve abstraction and loose coupling in Java.

What is encapsulation in Java?
Encapsulation is a principle of object-oriented programming that involves hiding the internal details of an object and exposing only what is necessary. In Java, encapsulation is achieved through access modifiers such as private, public, and protected. By using these access modifiers, the programmer can control the visibility of variables and methods in a class.