What is Java for Complete Beginners?

Write real Java programs and understand objects, not just syntax. You write real Java programs and understand objects, not just syntax. You build one project, Shelf, a text-based book tracker whose data is saved to a file, and you finish able to explain how each class in it works and why it is built that way.

Open the Java for Complete Beginners course page

Complete beginners who have never programmed, and people who tried Java before and got lost in the terms. You do not need any maths beyond everyday arithmetic. You should be comfortable making folders and files on your computer.

These are the prerequisites the course lists:

• No programming experience is needed.
• You can create folders and text files and open a terminal or command prompt. Lesson 1.1 shows you how to check your setup.

These are the tools and materials the course lists:

• A computer running Windows, macOS or Linux. Plan on roughly nine hours of study plus practice time, spread however suits you.
• A JDK (Java Development Kit), version 17 or newer. It is free. Eclipse Temurin from adoptium.net is one free choice, and other free builds work too. Check the current download page for versions and the installer for your system.
• A terminal that is already on your computer: Command Prompt or PowerShell on Windows, Terminal on macOS, or a shell on Linux.
• A text editor. Any plain editor works. Visual Studio Code is a free choice. A free Java IDE such as the Eclipse IDE also works; check each tool's current features and terms.
• Nothing in this course requires a paid tool or subscription.

Shelf: a text-based book tracker with saved data. Build Shelf, a menu-driven Java program that tracks the books you own or borrow, records reading progress and ratings, shows statistics, and saves everything to a file so it is still there the next time you run it. Your project uses classes, inheritance, an interface, an enum, collections, exceptions and file handling, and it comes with automatic checks. The finished deliverables are:

• The source files: Status.java, Describable.java, Book.java, BorrowedBook.java, Shelf.java, ShelfFile.java, ShelfApp.java and ShelfChecks.java.
• The output of java ShelfChecks showing All checks passed, including at least two checks you wrote yourself.
• A text file of six numbered acceptance results: fresh start, add and log reading, restart and reload, damaged data file, mistyped numbers, and a run from the packaged jar.
• shelf.jar, built with jar --create and --main-class, that starts with java -jar shelf.jar.

Java for Complete Beginners has 24 lessons in 6 modules, a workbook of 10 items and a capstone project. It is planned at about 9 hours in total. The lesson text runs to roughly 15,500 words.

Java for Complete Beginners has 6 modules:

• Module 1: Meet Java: Run Your First Programs. Set up Java, learn how a program is built and run, store numbers and text in variables, and print a formatted book card. This is the first piece of your Shelf project.
• Module 2: Decisions, Loops and Input. Teach your programs to choose, to repeat, and to listen. You finish with a menu-driven Shelf counter that asks you questions and keeps running until you quit.
• Module 3: Organizing Code and Data. Split your program into named methods, then store many values at once with arrays, lists and maps. You finish with a Shelf that remembers every book while it runs.
• Module 4: Objects: Your Own Types. Stop juggling parallel lists. Build a Book class that keeps its own facts together, protect its data, and manage a whole shelf of Book objects with search and sorting.
• Module 5: Objects That Work Together. Grow Shelf with inheritance, interfaces, enums and exceptions. You add borrowed books, a fixed set of reading statuses, and input that survives typing mistakes.
• Module 6: Save Your Data and Finish Shelf. Write and read files, turn objects into lines of text and back, check your work with tests, and assemble the finished Shelf app that remembers your books between runs.

All 24 lesson titles, module by module:

• Module 1: Meet Java: Run Your First Programs. 1.1 How Java Code Becomes a Running Program; 1.2 The Parts of a Program and How to Read Errors; 1.3 Variables and Numbers; 1.4 Text: Working with Strings.
• Module 2: Decisions, Loops and Input. 2.1 Making Decisions with if and else; 2.2 Many Choices: else if and switch; 2.3 Repeating Work with Loops; 2.4 Asking the User: Scanner and the Menu Loop.
• Module 3: Organizing Code and Data. 3.1 Methods: Name a Job Once, Use It Anywhere; 3.2 Arrays: A Fixed Row of Values; 3.3 ArrayList: A List That Grows; 3.4 HashMap: Look Things Up by Key.
• Module 4: Objects: Your Own Types. 4.1 Classes and Objects: Your Own Types; 4.2 Methods in Objects, this and static; 4.3 Encapsulation: Protect Your Data; 4.4 Lists of Objects: Search, Filter and Sort.
• Module 5: Objects That Work Together. 5.1 Inheritance: A Class That Builds on Another; 5.2 Interfaces and Polymorphism; 5.3 Enums: A Fixed Set of Choices; 5.4 Exceptions: Handling Things That Go Wrong.
• Module 6: Save Your Data and Finish Shelf. 6.1 Reading and Writing Files; 6.2 Saving and Loading the Shelf; 6.3 Checking Your Code with Tests and Debugging; 6.4 Capstone: Assemble, Run and Share Shelf.

The course is listed at beginner level and planned at about 9 hours in total. It has 24 lessons, each with objectives you can check yourself against.

Lesson 1 is "How Java Code Becomes a Running Program" (Module 1, Meet Java: Run Your First Programs). By the end of it the course says you will be able to:

• Explain what compiling and running mean in Java.
• Check for a JDK and install one if you need it.
• Compile and run your first program from a terminal.

Java for Complete Beginners defines 30 terms in plain words: Source code, Compiler (javac), Bytecode, JVM (Java Virtual Machine), JDK, Path, variable, Type, Cast, string, Method, Parameter, return value, Array, ArrayList, HashMap, Class, Object, Field, Constructor, Reference, Encapsulation, static, Inheritance, Interface, Polymorphism, Enum, exception, Stack trace and Checked exception.

Source codeCompiler (javac)BytecodeJVM (Java Virtual Machine)JDKPathvariableTypeCaststringMethodParameterreturn valueArrayArrayListHashMapClassObjectFieldConstructorReferenceEncapsulationstaticInheritanceInterfacePolymorphismEnumexceptionStack traceChecked exception

Java for Complete Beginners lists 10 official sources that were opened and checked while it was written, from 3 websites.

• adoptium.net
• openjdk.org
• docs.oracle.com

Java for Complete Beginners costs $39 (USD) as The Codex, the full written course with its workbook and templates. Studio (narrated video lessons) and the Full Operator path are not on sale yet.

How much do courses cost?

Java for Complete Beginners was prepared by Apex Flow Labs with AI assistance and checked before it was published. Every code sample, formula and command the course includes was run before it went in, the course records 32 verification checks, and it lists 10 official sources it checked. Do not take the label on trust: open the sources and run the examples yourself.

How Apex Flow Academy checks its courses

Yes for the core lessons, according to the course's own requirements list: "Nothing in this course requires a paid tool or subscription." Tool plans and prices change, so check each tool's current terms before you sign up.

Yes. The course lists this prerequisite: "No programming experience is needed." It is listed at beginner level. It also asks for:

• You can create folders and text files and open a terminal or command prompt. Lesson 1.1 shows you how to check your setup.

No. Java for Complete Beginners teaches and checks a skill, but it cannot promise an outcome. The course's own disclosure reads: "Created by Apex Flow Academy with AI assistance. For education only; not legal, tax, financial or medical advice. Results depend on your effort and circumstances."

Yes. Java for Complete Beginners includes a verifiable Certificate of Completion, issued by Apex Flow Academy when you finish every lesson, resolve every quiz question with at least 50% right on the first try, and tick the capstone checklist. It has a unique ID and a public verification page. It is a completion certificate, not a degree, licence, accreditation or exam result. The Full Operator path, with a final exam and capstone review, opens later with its own separate, stronger credential.

Is there a certificate?