In This Chapter
Creating proper variable declarations
Discovering the difference between primitive and reference types
Looking at Java's built-in data types
Getting input from the console
Getting input if you're using an older version of Java
In this chapter, you find out the basics of working with variables in Java. Variables are the key to making Java programs general purpose. The Hello, World! programs in the previous chapter, for example, are pretty specific: The only thing they say is “Hello, World!” But with a variable, you can make this type of program more general. You could vary the greeting so that sometimes it would say “Hello, World!” and at other times it would say “Greetings, Foolish Mortals.” Or you could personalize the greeting, so that it said “Hello, Bob!” or “Hello, Amanda!”
Variables are also ...