Java Basics Cheat Sheet: Your Quick Reference Guide

Java is a versatile and widely-used programming language known for its platform-independence, strong community support, and vast ecosystem of libraries and frameworks. Whether you’re a beginner getting started with Java or an experienced developer looking for a quick reference, this Java Basics Cheat Sheet has you covered.

Introduction

Java is a high-level, object-oriented programming language. It’s known for its portability and strong support for building scalable and reliable applications. This cheat sheet covers fundamental Java concepts and syntax.

Hello World

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

Variables and Data Types

Common Data Types

• int: Integer (e.g., 42)
• double: Double-precision floating-point (e.g., 3.14)
• boolean: Boolean (true or false)
• char: Character (e.g., 'A')
• String: Text (e.g., "Hello")

Variable Declaration

int age = 25;
double price = 9.99;
boolean isJavaFun = true;
char grade = 'A';
String greeting = "Hello, World!";

Operators

• Arithmetic: +, -, *, /, %
• Comparison: ==, !=, <, >…