Java in Object Oriented Programming

Java is one of many programming languages and technologies supported by Stackify’s leading tools, Retrace and Prefix. Because at Stackify we aim to help developers become better developers, we’re taking a look at some of the foundational concepts in the Java programming language. Read on for a primer on OOP concepts in Java.

Definition of OOP Concepts in Java

OOP concepts in Java are the main ideas behind Java’s Object Oriented Programming. They are an abstraction, encapsulation, inheritance, and polymorphism. Grasping them is key to understanding how Java works. Basically, Java OOP concepts let us create working methods and variables, then re-use all or part of them without compromising security.

List of OOP Concepts in Java

There are four main OOP concepts in Java. These are:

  • Abstraction. Abstraction means using simple things to represent complexity. We all know how to turn the TV on, but we don’t need to know how it works in order to enjoy it. In Java, abstraction means simple things like objects, classes, and variables represent more complex underlying code and data. This is important because it lets avoid repeating the same work multiple times.

  • Encapsulation. This is the practice of keeping fields within a class private, then providing access to them via public methods. It’s a protective barrier that keeps the data and code safe within the class itself. This way, we can re-use objects like code components or variables without allowing open access to the data system-wide.

  • Inheritance. This is a special feature of Object Oriented Programming in Java. It lets programmers create new classes that share some of the attributes of existing classes. This lets us build on previous work without reinventing the wheel.

  • Polymorphism. This Java OOP concept lets programmers use the same word to mean different things in different contexts. One form of polymorphism in Java is method overloading. That’s when different meanings are implied by the code itself. The other form is method overriding. That’s when the different meanings are implied by the values of the supplied variables. See more on this below.

How OOP Concepts in Java Work

OOP, concepts in Java work by letting programmers create components that can be re-used in different ways, but still maintain security.

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