Book Image

Java Programming for Beginners

By : Mark Lassoff
Book Image

Java Programming for Beginners

By: Mark Lassoff

Overview of this book

Java is an object-oriented programming language, and is one of the most widely accepted languages because of its design and programming features, particularly in its promise that you can write a program once and run it anywhere. Java Programming for Beginners is an excellent introduction to the world of Java programming, taking you through the basics of Java syntax and the complexities of object-oriented programming. You'll gain a full understanding of Java SE programming and will be able to write Java programs with graphical user interfaces that run on PC, Mac, or Linux machines. This book is full of informative and entertaining content, challenging exercises, and dozens of code examples you can run and learn from. By reading this book, you’ll move from understanding the data types in Java, through loops and conditionals, and on to functions, classes, and file handling. The book finishes with a look at GUI development and training on how to work with XML. The book takes an efficient route through the Java landscape, covering all of the core topics that a Java developer needs. Whether you’re an absolute beginner to programming, or a seasoned programmer approaching an object-oriented language for the first time, Java Programming for Beginners delivers the focused training you need to become a Java developer.
Table of Contents (12 chapters)

Operating java variables

The following is a representation of the information stored by our variable x, that is, the variable in the main method of our Java program:

You'll notice that this variable has three core components; let's go through them quickly:

  • On the left-hand side, I put this variable's name, which is the keyword that we use to reference it within the scope, and a memory location. Our variables point to a memory location, and in this memory location, we store the variable's value.
  • We can think of the name and memory location as being very static; they're not really going to change for this individual variable identifier throughout the course of our program's execution. However, we can, and often do, freely change the value stored in the variable's referenced memory location.

So why is this important? Well, over the course of...