Welcome to the most comprehensive Java Programming Tutorial. Learn Java from absolute basics with practical examples, exercises, and real-world projects.

Introduction to Java Programming

Java is an Object Oriented programming language developed by "Sun Microsystems of USA" in 1991.

It was originally called Oak by James Gosling - one of the inventors of Java!

JAVA = Purely object oriented

What is Java?

1991

Project Oak

James Gosling starts developing Oak at Sun Microsystems

1995

Java 1.0

First public release of Java

2010

Oracle Acquisition

Oracle acquires Sun Microsystems and Java

How Java Works?

📝
Source Code
Write Java code in .java files
⚙️
Compiled
javac compiles to bytecode
🔧
Bytecode
Platform-independent .class files
🖥️
Interpreted
JVM interprets bytecode
⚡
Machine Code
Executes on target machine

Java is compiled into bytecode and then it is interpreted to machine code for a given machine.

This makes Java platform independent - "Write Once, Run Everywhere"

Java Installation Guide

1

Install JDK (Java Development Kit)

Go to Google & type "Install JDK" or visit Oracle's official website

Terminal Commands 
# Verify installation 
java -version  javac -version

JDK → Java Development Kit = Collection of tools used for developing and running Java programs

2

Install IDE (Integrated Development Environment)

Go to Google & type "Install IntelliJ IDEA" or choose your preferred IDE

JRE → Java Runtime Environment = Helps in executing programs developed in Java

Your First Java Program

Hello World Program

HelloWorld.java 
public class HelloWorld {
    public static void main(String[]  args) {
        System.out.println("Hello, World!");
        System.out.println("Welcome to Java Programming!");
    }
}

How to Run:

1
Compile: javac HelloWorld.java
2
Run: java HelloWorld
3
Output: Hello, World!
Welcome to Java Programming!

Course Overview

01

Variables & Data Types

Keywords, variables, primitive types, and literals. Learn the foundation of Java programming.

Start Learning
02

Operators & Expressions

Arithmetic, logical, comparison, and assignment operators with practical examples.

Start Learning
03

Strings

String manipulation, methods, formatting, and advanced string operations.

Start Learning
04

Conditionals

If-else statements, switch-case, and decision making structures in Java.

Start Learning
05

Loops

For, while, do-while loops and loop control statements for iteration.

Start Learning
06

Arrays

Single and multi-dimensional arrays, array methods, and memory management.

Start Learning
07

Methods

Method creation, parameters, return types, method overloading, and scope.

Start Learning
08

OOP Introduction

Object-Oriented Programming concepts, classes, objects, and encapsulation.

Start Learning
09

Constructors

Default and parameterized constructors, constructor overloading, and this keyword.

Start Learning
10

Inheritance

Class inheritance, super keyword, method overriding, and polymorphism basics.

Start Learning
11

Abstract & Interfaces

Abstract classes, interfaces, multiple inheritance, and advanced OOP concepts.

Start Learning
12

Packages

Package creation, import statements, access modifiers, and code organization.

Start Learning
13

Multithreading

Thread creation, synchronization, concurrent programming, and thread safety.

Start Learning
14

Exception Handling

Try-catch blocks, custom exceptions, throws keyword, and error management.

Start Learning

Ready to Start Learning Java?

Begin your journey with Java fundamentals and build your programming skills step by step.

Start Learning Now →