java core

Java is a class-based, object-oriented programming language, and at the root of its class hierarchy is the Object class. This class is the superclass of all classes in Java, meaning every class implicitly inherits from the Object class unless it explicitly extends another class. The Object class is part of the java.lang package and provides […]

Inheritance is a fundamental concept in object-oriented programming (OOP) that allows a new class, called the “subclass” or “derived class,” to inherit attributes and behaviors from an existing class, known as the “superclass” or “base class.” The derived class can reuse, extend, or override the functionalities of the base class. Key points about inheritance Code

In Java, Composition, Inheritance, and Delegation are three fundamental concepts used in object-oriented programming, each serving distinct purposes in structuring classes and their relationships. Composition Composition involves creating complex objects by combining simpler ones, forming a “has-a” relationship. In Java, this is achieved by including an instance of another class within a class. For example,

Access specifiers in Java are keywords that define the visibility or accessibility of classes, methods, and fields within a Java program. There are four access specifiers in Java: public, private, protected, and default (package-private). Public The public access specifier allows unrestricted access to the associated class, method, or field. It can be accessed from any

1. Constructor Overloading practice program-1 This program demonstrates constructor overloading by creating objects with different constructors. It initializes student details using both the default and parameterized constructors. 2. Constructor Overloading practice program-2 This program calculates the area of a square and a rectangle using overloaded constructors. Different constructors initialize the required dimensions. 3. Method Overloading

Method overloading in Java is a powerful feature that allows a class to have multiple methods with the same name but different parameters within the same class. This provides flexibility and enhances code readability. The main advantages of method overloading in Java are as follows Readability and Simplicity:Method overloading makes code more readable and simpler

In Java, constructor overloading refers to the practice of defining multiple constructors within a class, each with a different parameter list. This allows an object to be instantiated in various ways, providing flexibility and versatility in how instances of a class are created. Constructor overloading is a form of polymorphism in which a class has

Object-Oriented Programming (OOP) is a fundamental paradigm in the world of software development. It’s a programming approach that revolves around the concept of “objects” and provides a structured way to model real-world entities, their behaviours, and their interactions within a computer program. This introduction will delve into the core principles and concepts of OOP, providing

In Java, nested classes and inner classes provide a way to group classes within another class, allowing for better organization of code and encapsulation of functionality. There are two types of nested classes: static nested classes and inner classes. Static Nested Classes A static nested class is a class declared as a static member of

Garbage collection in Java is the automatic process by which the Java Virtual Machine (JVM) identifies and removes objects that are no longer reachable or in use by the program. The primary purpose of garbage collection is to reclaim memory occupied by objects that are no longer needed, freeing up resources and preventing memory leaks.