Free ebook introducing Java programming, from variables and loops to methods, arrays, classes, objects, and a console application.
Free ebook content
-
Getting Started with Java Programming and Your First Java Program
+ Exercise: In a minimal Java console program, what is the correct sequence to build and execute Main.java from the terminal?
-
Variables and Data Types in Java
+ Exercise: You want the result of dividing 5 by 2 to be 2.5 instead of 2. Which change ensures Java performs decimal division?
-
Operators and Expressions for Java Calculations
+ Exercise: Why might you cast one operand to double before dividing two integers in Java (for example, (double) items / people)?
-
Working with Input and Output in Java Console Programs
+ Exercise: After reading a number with Scanner (e.g., nextInt or nextDouble), why might a following nextLine() return an empty string, and what is the typical fix?
-
Conditional Logic with if, else if, and switch in Java
+ Exercise: In an else-if chain used for grading thresholds, why should the highest score threshold be checked first?
-
Loops in Java: Repeating Tasks with for, while, and do-while
+ Exercise: Which situation is the best match for using a do-while loop instead of a while loop?
-
Methods in Java: Creating Reusable Code Blocks
+ Exercise: A method is defined as public static double calculateTotal(double price, int quantity). Which call correctly matches its parameter types and order?
-
Arrays and Basic Collections for Handling Multiple Values
+ Exercise: You need to store a list of scores where the number of items may grow or shrink as the program runs. Which approach is most appropriate, and why?
-
Object-Oriented Programming Fundamentals in Java: Classes and Objects
+ Exercise: Why would a BankAccount class avoid providing a public setBalance method?
-
Putting It Together: Building a Small Java Console Application
+ Exercise: In a console Task List app that stores tasks in an ArrayList and lets users choose tasks by number (shown as 1-based), what is the correct way to safely handle a user-entered task number before accessing the list to mark it done or remove it?
About the free ebook
Java for Beginners: A Complete Introduction to Programming with Java
Start building a solid programming foundation with this free ebook on Java, one of the most widely used languages for applications, backend systems, Android development, and enterprise software.
Learn Java through practical programming concepts
This guide introduces the core ideas needed to write and understand Java console programs. You will create a first program, work with variables and data types, perform calculations with operators, and read input from users.
As you progress, you will use conditional statements to make decisions, loops to repeat tasks, and methods to organize reusable code. The ebook also explains how arrays and basic collections hold multiple values and introduces object-oriented programming with classes and objects.
Build confidence with essential Java skills
- Write, run, and understand basic Java programs.
- Use numeric, text, Boolean, and other common data types.
- Control program flow with if, else if, switch, and loops.
- Create methods that make code clearer and easier to reuse.
- Model simple real-world ideas using classes and objects.
From syntax to a complete console project
The final section brings the concepts together in a small Java console application. By following the examples and practicing each topic, you can move from individual statements to structured programs that solve simple problems.
This free ebook is designed as a clear introduction to Java programming and a useful starting point for further study in software development.
What Java concepts does this free ebook cover?
It covers Java setup, variables, operators, console input and output, conditions, loops, methods, arrays, classes, and objects.
Does the ebook explain Java if statements and switch statements?
Yes. It explains conditional logic with if, else if, and switch for controlling program decisions.
Is there a Java project included in the ebook?
Yes. The final section combines the concepts in a small Java console application.
This ebook includes:
10 content chapters
Digital certificate of course completion (Free)
Exercises to train your knowledge
100% free, from content to certificate
Ready to get started?
recommended
In the app you will also find...
Over 5,000 free courses
Programming, English, Digital Marketing and much more! Learn whatever you want, for free.
Study plan with AI
Our app's Artificial Intelligence can create a study schedule for the course you choose.
From zero to professional success
Improve your resume with our free Certificate and then use our Artificial Intelligence to find your dream job.
You can also use the QR Code or the links below.
