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There are a lot of differences between instance variable, class variable, and local variable in Java, and knowing them will help you to wr...

Many times, I have seen questions like why should we use an interface in Java? I f we can not define any concrete methods inside the interf...

Interface in Java is a simple concept but many programmers fail to realize their actual use, including me. When I started learni...

Both Abstraction and Encapsulation are two of the four basic OOP concepts which allow you to model real-world things into objects so that...

In Object-oriented programming, one object is related to another to use functionality and service provided by that object. This relationshi...

Almost all Java developers know that compiler adds a default constructor or better known as a no-argument constructor in every Java class, ...

Type casting in Java is to cast one type, a class or interface, into another type i.e. another class or interface. Since Java is an Object...

What is constructor in Java Constructor in Java is a block of code which is executed at the time of Object creation. But other than ge...

Object in Java Object in Java programming language or any other Object-oriented programming language like C++ is the core of the OOPS c...

Great Example of Open Closed Design Principle I am a big fan of design pattern articles and love to read articles on design patterns and...

When I first about Class in Java I just thought what is this Class in Java and from that date to now Whenever we talk about java its reall...

Inheritance in Java is an Object oriented or   OOPS concepts , which allows to emulate real world Inheritance behavior, Inheritance allows...

What is Polymorphism in Java Polymorphism is an important Object oriented concept and is widely used in Java and other programming lan...

The answer to this question is both Yes and No , depending on whether you are talking about a top-level class or a nested class in Java. Yo...

The Law of Demeter also known as  the principle of least knowledge is a coding principle, which says that a module should not know about th...

What is an interface in Java? Interface in java is a core part of the Java programming language and one of the ways to achieve abstracti...

Hello guys, it's been a long since I share d object-oriented design and system design question s in this blog. It was almost...

Though both Inheritance and Composition provide code reusability, the main difference between Composition and Inheritance in Java is that C...

OOP Interview questions or Object-oriented programming and design interview question are an integral part of any programming job interviews...

Can a static method be overridden in Java, or can you override and overload static method in Java , is a common Java interview questions m...