Introduction to Chapter 3

 Chapter 3 explores the use of predefined classes and objects we can create from them.  Using classes and objects made from them is a fundamental part of object-oriented programming.  We will learn that predefined classes are available from the Java standard class library and through libraries provided by third-party vendors.

We will discuss these pre-defined classes:

• String class
• Scanner class
• Math class
• Random class
• DecimalFormat class

In addition, we will have a look a enumerated variable types.