Java

Part of the Fundamentals section of Coddy's Java journey. Lesson 1 of 73.

Java is an incredibly powerful and versatile programming language that lets you create everything from mobile apps to enterprise software, with the amazing ability to ‘write once, run anywhere’.

Challenge

Beginner

Welcome to your first Java program! The code is already written for you.

What to do:

Look at the code: System.out.println("Hello Java!");
Press the "Run Code" button to execute it
You should see "Hello Java!" appear in the output

Try it yourself

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

All lessons in Fundamentals

2Variables Part 1

Numbers String Boolean char Type Declaration

5Operators Part 2

Logical Operators Part 1 Logical Operators Part 2 Recap - Simple Logic Logical Operators Part 3 Logical Operators Part 4

8Calculator App

Welcome Message Getting Numbers

Basic Operations

Formatted Output

11Arrays Basics

Declaring Arrays Accessing Elements Modifying Arrays Array Methods Recap - Product Array Recap - Reversed Array

14Final Challenges

Number Pattern Pattern Finder Student Grade Calculator

3Variables Part 2

Constants Naming Conventions Recap - Initialize Variables Type Casting Part 1 Type Casting Part 2

6Decision Making

If Statement If - Else Switch Statement Ternary Operator Recap - If Else Nested If - Else

9Loops

For Loop Part 1 While Loop Do While Loop Break Continue For Loop Part 2 Nested Loop Infinite Loop Recap - Dynamic Input

12Iterating Over Arrays

Using For Loop Enhanced For Loop Common Array Operations

Practice on your own: Online Java compiler