Free Programming Books

14 Excellent Free Books to Learn Java

Java is a general-purpose, concurrent, class-based, object-oriented, high-level programming language and computing platform first released by Sun Microsystems in 1995. It is related in some ways to C and C++, in particular with regard to its syntax, and borrows a few ideas from other languages. Java applications are compiled to bytecode that can run on any Java virtual machine (JVM) regardless of computer architecture.

Java is designed to be simple enough that many programmers can quickly become proficient in the language. It’s one of the most popular programming languages especially for client-server web applications.

Some popularity indexes show that Java holds the top spot with C. The respected TIOBE Index shows Java remains the most popular programming language.

We recommend the following Java books. All of them are free to download.


1. Introduction to Programming Using Java, Eighth Edition by David J. Eck

Introduction To Programming Using JavaThe Eighth Edition of Introduction to Programming Using Java is a free, on-line textbook on introductory programming, which uses Java as the language of instruction.

This book is directed mainly towards beginning programmers, although it might also be useful for experienced programmers who want to learn something about Java.

The book isn’t designed to provide complete coverage of the Java language, but it’s an excellent introductory text.

Read the book


2. Think Java – How to Think Like a Computer Scientist by Allen B. Downey, Chris Mayfield

Think JavaThink Java is an excellent introduction to Java programming for beginners.

Chapters cover:

  • Variables and types
  • Input and output
  • Void methods
  • Conditionals and logic – includes conditional execution, alternative execution, chained and nested conditionals, the return statement, type conversion, recursion, and stack diagrams for recursive methods
  • Value methods including composition, overloading Boolean expressions and methods, and logical operators
  • Iteration and loops examines the while statement, tables, two-dimensional tables, and encapsulation
  • Strings and things – characters, length, traversal, run-time errors, reading documentation, the indexOf method, looping and counting and more
  • Mutable objects – use two objects from Java libraries, Point and Rectangle
  • Create your own objects
  • Arrays – a set of values where each value is identified by an index
  • Arrays of Objects – defines a Card class and write methods that work with Cards and arrays of Cards
  • Objects of Arrays – creates a Deck class and write methods that operate on Decks
  • Object-oriented programming – presents object-oriented programming (OOP) and transforms the Card and Deck classes into a more OOP style
  • GridWorld: Part 3
  • Appendices: Graphics, Input and Output in Java, Program development, and Debugging

Permission is granted to copy, distribute, transmit and adapt this work under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

Read the book.

You can order a paperback version from Amazon.


3. Open Data Structures by Pat Morin

Open Data StructuresOpen Data Structures covers the implementation and analysis of data structures for sequences (lists), queues, priority queues, unordered dictionaries, ordered dictionaries, and graphs.

The book and is released under a Creative Commons Attribution License. Read the book for free – released in HTML, PDF, and the book’s LaTeX, Java/C++/Python sources can be downloaded from GitHub. There is also a paperback version to buy. The book has been translated into Slovenian and Turkish.

Chapters cover:

  • Array-Based Lists – implementations of the List and Queue interfaces where the underlying data is stored in an array, called the backing array
  • Linked Lists – studies implementations of the List interface, using pointer-based data structures instead of arrays
  • Skiplists – a data structure which has a variety of uses
  • Hash Tables – focuses on two of the most common implementations of hash tables: hashing with chaining and linear probing
  • Binary Trees – introduces one of the most fundamental structures in computer science
  • Random Binary Search Trees
  • Scapegoat Trees – a binary search tree data structure
  • Red-Black Trees – a version of binary search trees with logarithmic height
  • Heaps – discusses two implementations of the priority Queue data structure
  • Sorting Algorithms – discusses algorithms for sorting a set of n items
  • Graphs – study two representations of graphs and basic algorithms that use these representations
  • Data Structures for Integers
  • External Memory Searching

The book is available in HTML, PDF, Java sources.

Read the book


Next page: Page 2 – Java Application Development on Linux and more books

Pages in this article:
Page 1 – Introduction to Programming Using Java and more books
Page 2 – Java Application Development on Linux and more books
Page 3 – Java Programming for Kids and more books
Page 4 – Object Oriented Programming using Java and more books
Page 5 – Java Structures and more books


All books in this series:

Free Programming Books
JavaGeneral-purpose, concurrent, class-based, object-oriented, high-level language
CGeneral-purpose, procedural, portable, high-level language
PythonGeneral-purpose, structured, powerful language
C++General-purpose, portable, free-form, multi-paradigm language
C#Combines the power and flexibility of C++ with the simplicity of Visual Basic
JavaScriptInterpreted, prototype-based, scripting language
PHPPHP has been at the helm of the web for many years
HTMLHyperText Markup Language
SQLAccess and manipulate data held in a relational database management system
RubyGeneral purpose, scripting, structured, flexible, fully object-oriented language
AssemblyAs close to writing machine code without writing in pure hexadecimal
SwiftPowerful and intuitive general-purpose programming language
GroovyPowerful, optionally typed and dynamic language
GoCompiled, statically typed programming language
PascalImperative and procedural language designed in the late 1960s
PerlHigh-level, general-purpose, interpreted, scripting, dynamic language
RDe facto standard among statisticians and data analysts
COBOLCommon Business-Oriented Language
ScalaModern, object-functional, multi-paradigm, Java-based language
FortranThe first high-level language, using the first compiler
ScratchVisual programming language designed for 8-16 year-old children
LuaDesigned as an embeddable scripting language
LogoDialect of Lisp that features interactivity, modularity, extensibility
RustIdeal for systems, embedded, and other performance critical code
LispUnique features - excellent to study programming constructs
AdaALGOL-like programming language, extended from Pascal and other languages
HaskellStandardized, general-purpose, polymorphically, statically typed language
SchemeA general-purpose, functional language descended from Lisp and Algol
PrologA general purpose, declarative, logic programming language
ForthImperative stack-based programming language
ClojureDialect of the Lisp programming language
JuliaHigh-level, high-performance language for technical computing
AwkVersatile language designed for pattern scanning and processing language
CoffeeScriptTranscompiles into JavaScript inspired by Ruby, Python and Haskell
BASICBeginner’s All-purpose Symbolic Instruction Code
ErlangGeneral-purpose, concurrent, declarative, functional language
VimLPowerful scripting language of the Vim editor
OCamlThe main implementation of the Caml language
ECMAScriptBest known as the language embedded in web browsers
BashShell and command language; popular both as a shell and a scripting language
LaTeXProfessional document preparation system and document markup language
TeXMarkup and programming language - create professional quality typeset text
ArduinoInexpensive, flexible, open source microcontroller platform
TypeScriptStrict syntactical superset of JavaScript adding optional static typing
ElixirRelatively new functional language running on the Erlang virtual machine
F#Uses functional, imperative, and object-oriented programming methods
TclDynamic language based on concepts of Lisp, C, and Unix shells
FactorDynamic stack-based programming language
EiffelObject-oriented language designed by Bertrand Meyer
AgdaDependently typed functional language based on intuitionistic Type Theory
IconWide variety of features for processing and presenting symbolic data
XMLRules for defining semantic tags describing structure ad meaning
ValaObject-oriented language, syntactically similar to C#
Standard MLGeneral-purpose functional language characterized as "Lisp with types"
DGeneral-purpose systems programming language with a C-like syntax
DartClient-optimized language for fast apps on multiple platforms
MarkdownPlain text formatting syntax designed to be easy-to-read and easy-to-write
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