Dynamic method dispatch is a way to resolve overridden method calls at run time instead of compile time. It is based on the concept of up-casting. Up-casting means “A super class reference variable can refer to subclass object”. Java Dynamic Method Dispatch Example package com.w3schools; class Engineer { public void show(){ System.out.println(“Engineer details.”); } } … Read more
If a subclass provides a method with the same signature (name and parameter) as in its superclass, then the subclass overrides the method of its superclass. This process of overriding a superclass method by a subclass is known as method overriding. Conditions for method overriding: The method in a subclass must have the same signature … Read more
Method overloading is a mechanism to implement static/compile time polymorphism in Java. Method overloading means more than one method in a class with the same name but different parameters. Parameters can differ in type, number, or order. Compiler resolves method calls by matching the method signature at compile time, that’s why it is known as … Read more
Polymorphism in the real world Polymorphism means more than one form. Water can be of any form solid, liquid, or gas. Polymorphism in Programming In Java polymorphism is a mechanism in which something behaves differently based on its call. Let us take the example of the + operator and see the below example. PolymorphismTest.java package … Read more
The dictionary meaning of Encapsulation is “The condition of being enclosed.” Capsule: A capsule refers to a small container that contains a dose of medicine. Definition of Encapsulation: Encapsulation is a way of wrapping code and data into a single unit. Encapsulation in the real world: Let us take an example of HR in a … Read more
Abstraction in the real world: The abstraction is a way of hiding complexity. Let us take the example of a car. We know that if the accelerator is pressed, speed will increase but don’t know the internal process of how speed will be increased. Abstraction in programming: The abstraction is a way to show essential … Read more
The main OOPs Concepts in Java are as follows: 1. Abstraction: Abstraction is a way of hiding complexity. Let us take the example of a car. We know that if the accelerator is pressed, the speed will increase but don’t know the internal process of how speed will be increased. 2. Encapsulation: Encapsulation is a … Read more
Before discussing the OOPs concepts let us have a brief look at objects and classes with real-world examples. Object in the Real world: Any real-world entity is known as an Object. Every real-world object/entity has two characteristics state and behavior. Let us take the example of a car. Its state is defined by color, current … Read more
OOPs is a style of computer programming that represents concepts as objects that have states and behaviors. e.g. objective-c, c#, Java. Difference between Object Oriented Programming and Procedural Programming. Procedural Programming Object-Oriented Programming In Procedural Programming, a program is created in a step-by-step instructional format and instructions are executed in order. Follow a top-down approach. Less secure … Read more
Let us start Java programming with the first simple Java program to print “Hello World”. As we already discussed in earlier tutorials, Java is an Object-oriented language so it requires writing code inside a class. Java Hello World Example: HelloWorld.java package com.w3schools; /** * This program will print “Hello World”. * @author W3schools360 **/ public … Read more