Learn the Java programming language with the simplest explanations of the basic to advanced concepts. Start your Java development journey today.
What is a LinkedList? A LinkedList is a special type of data structure that we can use to store a collection of elements in a connected form. An ArrayList keeps all its elements in one continuous memory block, but a LinkedList stores elements in separate nodes. Each node holds two main parts: Because a LinkedList … Read more
What is ArrayList? An ArrayList is a special kind of list that can store multiple items and change its size automatically. Regular arrays have a fixed length, but an ArrayList can grow or shrink as you add or remove elements. It is part of Java.util package and is a key part of Java’s Collections Framework. … Read more
Introduction of Java Date It’s important to work with dates and time in many Java programs, because when we create a to-do app, record when a user logs in, or display the current time. Handling dates and times correctly makes our application more meaningful and reliable. Why Do We Need Dates in Java? Dates and … Read more
Introduction To User Input In real-world programs, interaction between the user and the computer is important. A program that shows only output without accepting input is one-sided. that’s the reason we use user input to take information from the user, process it, and then give results based on the output. User input refers to the … Read more
What is an Enum? In Java, an enum is a special type that allows you to create a fixed set of values with meaningful names. Think of an enum as a list of options that cannot change. For example: days of the week (MONDAY, TUESDAY…) or directions (NORTH, SOUTH, EAST, WEST). An enum (short for … Read more
What is an Interface? An interface in Java is a collection of abstract methods (methods without a body) and constants (variables marked as final and static). It is mainly used to achieve abstraction and multiple inheritance in Java. In Java, an interface is like a plan or agreement that says what a class should do, … Read more
Abstraction is a most important concept in object-oriented programming (OOP) that focuses on showing only the necessary information to the user while hiding unnecessary details. In simple words, abstraction means you know what something does, but you don’t need to know how it does it. In Java, abstraction helps developers to design flexible and secure … Read more
What are Inner Classes in Java? In Java, an inner class is a class that is defined inside another class. It is also known as a nested class, and it exists to represent a strong relationship between two classes. Inner classes make the code more organized, readable, and secure. They are mainly used when a … Read more
Polymorphism is a fundamental concept in Object-Oriented Programming (OOP) in Java. The word Polymorphism comes from two Greek words: So, polymorphism literally means “many forms.” In simple terms, polymorphism allows the same method or object to behave differently depending on the situation. It gives Java programs flexibility and reusability and helping developers write cleaner and … Read more
Inheritance means acquiring the properties and methods of another class, just like a child inherits properties from their parents. In simple words, inheritance helps us to reuse code that has already been written, instead of writing it again. Real-Life Example to Understand Inheritance Imagine a Parent class called Animal and a Child class called Dog. … Read more