Java Tutorial: Packages in Java

It is the implementation reusability concept
It maintains huge collection of classes , interfaces
Similar kind of classes and interfaces are packed together in the name of packages

e.g.

Steps involved in the creation of package

using the keyword package , package can be generated
Followed by package Keyword, package name has to be allotted
There must be a folder with the same name of a package
It should be positioned at the first line
Its a good programming practice to specify package name with all small case letters
For a group of classes, only a single package statement is permitted
The byte code file is stored in the package named folder
Any no. of import statements can be included in a program
Those statements are to be placed following the package statement but prior to classNamedeclaration

Syntax for the Creation of Package

{`
package packagename;
public classNameclasname
{
// clas definition;
}
`}

It is necessary to place the file inside the directory where in the name of the package and directory reflects the same

e.g.

...\packagename\clasname.java

When the beneath example is considered the main

classname is MammalInt inside the folder animals

e.g.

The classNameis considered as animals.MammalInt

The pathname is included or preceded with the package name

e.g.

The path is considered as animals/MammalInt.java

The Syntax for importing a package is

import Packagename.Classname – It imports specific Class i.e. mentioned className(or)

import Packagename.* - It imports all classes in a given package

Example