Java Package

A Java package is a set of classes which are grouped together.

This grouping helps to organize Java classes and codevent multiple Java classes with the same name.

Using Java Packages

To use a package in your Java source code, you must either import the package or use the fully qualified class name each time you use a class.

Using Fully Qualified Class Names

This example uses the Ammunition class from the ballistics package:

ballistics.Ammunition caliber = new ballistics.Ammunition();

As you can imagine, using fully qualified class names can become a bit of a hassle.

Importing Classes

import java.util.ArrayList; // Import the ArrayList class from the java.util package import java.util.*; // Import all public classes from the java.util package