Java Programming

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Module 1: Getting Started with Java

Introduction to Java

intro-java

Your First Java Program

hello-java

Comments in Java

java-comments

Module 2: Variables & Data Types

Primitive Data Types

primitive-types

Strings

java-strings

Type Casting

type-casting

Module 3: Control Flow

If-Else Statements

if-else

For Loops

for-loops

While Loops

while-loops

Module 4: Object-Oriented Programming

Classes and Objects

classes-objects

Constructors

constructors

Inheritance

inheritance

Module 5: Arrays & Collections

Arrays

arrays

ArrayList

arraylist

HashMap

hashmap

Getting Started with Java

Your First Java Program

Every Java program needs a class and a main method.

The Structure

public class Main {
    public static void main(String[] args) {
        System.out.println("Hello, Java!");
    }
}

Breaking It Down:

Part	Meaning
`public class Main`	Defines a class named Main
`public static void main`	The entry point of the program
`String[] args`	Command-line arguments
`System.out.println`	Prints text to console

The class name must match the filename (Main.java).

Visualizer

$ java Main.java

Hello, Java!

Interactive Visualization

java

Output

Run execution to see output...