What is LinkedList? In Java, the LinkedList class is a part of the java.util package and implements the List and Deque interfaces. Unlike an ArrayList, which stores elements in a contiguous block of memory, a LinkedList stores elements in nodes, where each node contains the data and a reference to the next node in the … Read more

What is ArrayList? The ArrayList class in Java is part of the java.util package and provides a resizable array implementation. Unlike regular arrays in Java, which have a fixed size, an ArrayList can dynamically grow or shrink as needed. This makes it an essential part of Java’s Collections Framework and an excellent choice for situations … Read more

Introduction of Java Date Handling dates and times is an essential part of many Java applications, such as scheduling tasks, logging events, and formatting date/time data for display. Java provides various classes for working with dates, ranging from the legacy java.util.Date class to the modern and improved java.time package introduced in Java 8. Why is … Read more

Introduction User Input User input is an essential part of any interactive program. In Java, we use various classes and methods to read input from the user, whether it’s from the console, files, or other sources. Why is User Input Important? User input allows programs to become dynamic and interactive. Instead of hardcoding data, programs … Read more

What is an Enum in Java? In Java, an enum is a special data type that represents a collection of constants. Each constant in an enum is an instance of the enum type, making it type-safe and more readable. Enums are used when you have a fixed set of predefined values, such as days of … Read more

What is an Interface in Java? An interface in Java is a blueprint of a class. It is a collection of abstract methods and constants that specify the behavior that a class must implement. Unlike a class, an interface does not contain constructors and cannot have instance variables. Interfaces are primarily used to achieve abstraction … Read more

What is Abstraction in Java? Abstraction is a fundamental concept in object-oriented programming (OOP) that focuses on hiding the internal details and showing only the essential features of an object. In Java, abstraction allows you to define the behavior of an object without exposing the implementation details. This approach enhances modularity, code maintainability, and security. … Read more

What are Inner Classes in Java? An inner class in Java is a class defined within another class. Inner classes are associated with their enclosing class and provide a way to logically group classes that are used together. This structure improves code readability and makes the program modular. Inner classes are used when a class … Read more

What is Polymorphism in Java? Polymorphism is a fundamental concept in Object-Oriented Programming (OOP) that allows objects to take on many forms. The term “polymorphism” is derived from two Greek words: “poly,” meaning many, and “morph,” meaning forms. In Java, polymorphism enables methods to perform different tasks based on the object that invokes them. Why … Read more

What is Inheritance in Java? Inheritance is one of the core principles of Object-Oriented Programming (OOP) in Java. It allows one class (child class) to acquire properties and behaviors (methods) from another class (parent class). This concept promotes code reuse, makes the program more modular and simplifies maintenance. In Java, inheritance is implemented using the … Read more