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Trail: Learning the Java Language
Lesson: Interfaces and Packages

## Summary of Creating and Using Packages

> To create a package, you put a class or an interface in it. To put a class or an interface into a package, you put a `package` statement as the first statement in the source file for the class or the interface. The path name of the source and class file of a class or an interface mirrors the name of the package.

> To use a class or an interface that's in a different package, you have three choices:

> 1. Use the fully qualified name of the class or the interface.
> 2. Import the class or the interface.
> 3. Import the entire package of which the class or the interface is a member.

> You might have to set your class path so that the compiler and the interpreter can find the source and class files for your classes and interfaces.

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