We have briefly covered the subject of ‘classes’ in Chapters one and two. In this chapter, we will go over the general structure of a class file in Java and learn some important new class-related concepts in the process. We will also focus on intermediate-level Java concepts like file input/output using the Java.io package, collection objects, Java Enumerations, and Exceptions

In This Chapter:

A Typical Java Class

A sample of a typical Java class

Modifiers in Java

How modifiers are used in the Java program

Nested and Inner Classes

The functions of nested and inner classes

Varargs

A variable number of input parameters

Enum

A useful new feature of Java 5.0