MJ #23: Enums!

In Java, an enum, short for "enumeration," is a special data type that represents a fixed set of constant values. It's a way to define a collection of named values, which can make your code more readable and maintainable. Enums are often used when you have a set of values that are related and known …

MJ #22: Need of Inheritence

In Java, interfaces serve as a fundamental concept in object-oriented programming, and they are used to define a contract or a set of rules that a class must adhere to. Here are several key reasons for using interfaces in Java: Abstraction: Interfaces allow you to create a level of abstraction in your code. They define …

MJ #21: Inheritence simplified

Inheritance is one of the fundamental concepts in object-oriented programming (OOP), allowing you to create a new class (derived or child class) that inherits properties and behaviors (attributes and methods) from an existing class (base or parent class). This promotes code reuse and the creation of a hierarchical structure of classes. Here's a simple Java …

MJ #20: Anonymous Object in Java

In Java, an anonymous object refers to an object that is created without explicitly assigning it to a variable. Instead, it is used for a single, immediate purpose and is not stored in a named reference variable. Anonymous objects are typically used when you need an object to perform a specific action or method call, …

MJ #19: “super” keyword in Java

In Java, the super keyword is used to refer to the superclass or parent class of the current object. It can be used in several contexts to access superclass members, constructors, and methods. Here are some common usages of the super keyword: Accessing Superclass Members: You can use super to access members (fields or methods) …

MJ #18: Working with constructors in Java

Constructors in Java are special methods within a class that are used to initialize objects. They have several important purposes and usages: Object Initialization: The primary purpose of constructors is to initialize objects when they are created. When you create a new instance of a class using the new keyword, a constructor is called to …

MJ #17: Usage of “this” keyword

In Java, the "this" keyword is used to refer to the current instance of the class. It can be particularly helpful when there is a need to disambiguate between instance variables and parameters with the same name. Here's an example to illustrate the usage of the "this" keyword: package com.sarthak.concept.thisKeyword; public class Person { //declaring …

MJ #16: Understanding Encapsulation with Example

Encapsulation is one of the fundamental principles of object-oriented programming (OOP) and is a key concept in Java. It refers to the bundling of data (attributes or fields) and methods (functions or procedures) that operate on that data into a single unit called a class. This unit hides the internal details of how the data …

MJ #15: “static” in Java

In Java, the static keyword is used to create class-level members that are associated with the class itself rather than with specific instances of the class (objects). When a member (variable or method) is declared as static, it means there is only one instance of that member for the entire class, regardless of how many …

MJ #14: String, String buffer and String Builder classes in Java

In Java, the String, StringBuffer, and StringBuilder classes are used to work with strings, but they have different characteristics and are suitable for different scenarios. Here's an overview of each of these classes: String Class: String is an immutable class in Java. This means that once you create a String object, its content cannot be …

MJ #13: Understanding and using array of objects in Java

In Java, an array of objects is an array that holds references to objects of a particular class. This means that each element of the array is not an object itself but rather a reference to an object of the specified class. Here, we will explain in detail how to create and work with arrays …