Common Packages

• A package is a grouping of Java classes.

• To use a built-in Java class, you may need to import the package it is in; this statement imports the Java utility package:

  import java.util.*;

• The package is java.util and the .* at the end means all the classes in the package.

• The online documentation for the class indicates the package it is in.

  Common Java Packages

  java.io.*	I/O classes for applications
  java.util.*	utility classes

• Your IDE automatically puts your code inside a package - we will learn more about that later.

• For now, be sure to put all your source code for each program in the same package.

• This means that you will NOT import a package in order to use your own classes.