Java OOP

Java OOP Interview Questions with Answers

Java OOP interview questions guide lists some important and tricky questions and answers to help refresh the basic concepts with examples.

Object Oriented Programming Tutorials

Object-oriented programming (OOP) is a programming model that organizes software design around data or objects. Learn how Java supports OOP.

Java Instance Initializer Block

Java instance initializers are the code blocks containing the instructions to run every time a new class instance is created in runtime.

Java Constructor Example: Default and Parameterized

Java constructors are special method-like constructs that allow fully initializing the object state before other classes can use it.

Java Inheritance

Java Inheritance refers to the ability of a child class to inherit all the non-private properties and methods from the parent class.

Association, Aggregation and Composition in Java

Learn the difference between association, aggregation and composition in Java with source code, examples and real-life usecases.

Java OOP Concepts with Examples

In this Java OOPs concepts tutorial, we will learn four major object oriented principles– abstraction, encapsulation, inheritance, and polymorphism. They are also known as four pillars of the object oriented programming paradigm.

Java Access Modifiers

Java provides four access modifiers to set access levels for fields, methods and constructors i.e. public, private, protected, and default.

Java Method Overloading vs. Method Overriding

Learn the difference between method overloading and method overriding in java, which mainly involve method name, signature, parameters list and return type.

Polymorphism in Java

Polymorphism in Java is the ability to create member functions or fields that behaves differently in different programmatic contexts.

Difference between Encapsulation and Abstraction in Java

In Java, abstraction and encapsulation help in creating abstract actors in the system. Encapsulation is the realization of abstraction.

Difference between Interface and Abstract Class in Java

Learn about java abstract classes vs interfaces in detail and when to use interfaces and abstract classes in solving design issues in Java 8.

Abstraction in Java

In simple words, java abstraction captures only those details about an object that is relevant to the current perspective. Learn more about abstraction in java.