A package is a grouping of related types providing access protection and name space management. Note that types refers to classes, interfaces, enumerations, and annotation types. Enumerations and annotation types are special kinds of classes and interfaces, respectively, so types are often referred to in this lesson simply as classes and interfaces.

Package is a directory of related classes and interfaces.

Eg: java.lang.*

Here java is a directory,lang stands for language & it is a sub directory, * indicates collection of related classes & interfaces

Packages are Java?s way of grouping a variety of classes / interfaces together.
The classes contained in the packages of other programs can be easily reused.
In packages, classes can be unique compared with classes in other packages. Thus, two classes in two different packages can have the same name.
Packages provide a way to hide classes thus preventing other programs or packages from accessing classes that are meant for internal use only.
for example - java.lang
java.util

Package is a collection of .class files and java files
2)all the files in the package must be public.
3)the file must contain the keyword as "package".
4)a package can contain subpackege
5)we can use the classes in package by using import keyword.

Packages are group of inter-related classes.eg-In math class we can do addition ,subtractionetc.
example of classes are:java.applet
which is used for implementing and creating applets.

packages contain combination of methods and classes.there are many packages available ex:util,io,net,awt etc

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