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Java Cheat Sheet

Print-ready cheat sheet for Java, organized for fast lookup, study, and desk-side use

Source: Oracle Java Documentation (docs.oracle.com/javase)
License: MIT
Variants: 3 download options
Updated: 2026-03-27

Sample

What's in this cheat sheet

Hello World

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

Compile & Run

javac Main.java      # compile
java Main             # run
java Main.java        # single-file (Java 11+)

Naming Conventions

`ClassName`	PascalCase for classes and interfaces
`methodName`	camelCase for methods and variables
`CONSTANT_NAME`	UPPER_SNAKE for constants
`com.example.pkg`	Lowercase reverse domain for packages

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