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Introduction to Programming

You're reading from   Introduction to Programming Learn to program in Java with data structures, algorithms, and logic

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Product type Paperback
Published in Jun 2018
Publisher Packt
ISBN-13 9781788839129
Length 722 pages
Edition 1st Edition
Languages
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Author (1):
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Nick Samoylov Nick Samoylov
Author Profile Icon Nick Samoylov
Nick Samoylov
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Toc

Table of Contents (21) Chapters Close

Preface 1. Java Virtual Machine (JVM) on Your Computer FREE CHAPTER 2. Java Language Basics 3. Your Development Environment Setup 4. Your First Java Project 5. Java Language Elements and Types 6. Interfaces, Classes, and Object Construction 7. Packages and Accessibility (Visibility) 8. Object-Oriented Design (OOD) Principles 9. Operators, Expressions, and Statements 10. Control Flow Statements 11. JVM Processes and Garbage Collection 12. Java Standard and External Libraries 13. Java Collections 14. Managing Collections and Arrays 15. Managing Objects, Strings, Time, and Random Numbers 16. Database Programming 17. Lambda Expressions and Functional Programming 18. Streams and Pipelines 19. Reactive Systems 20. Other Books You May Enjoy

Classes and objects (instances)

A class is used as the template for creating objects. When an object is created, all fields and methods declared in the class are copied into an object. The combination of field values in an object is called object state. The methods provide object behavior. An object is also called an instance of a class.

Each object is created by using the operator new and a constructor that looks like a special kind of method. The primary duty of a constructor is to set an initial object state.

Let's us now have a closer look at Java classes and objects.

Java classes

Java classes are stored in .java files. Each .java file may contain several classes. They are compiled by the Java compiler javac and...

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