Packages:
Packages are nothing but folder structure, inside that we
will create our java classes.
Classes with related functionality are bundle together in
the same packages.
If you put all files of a project to a single package, it
will be very difficult to manage the files.
Advantages of
Packaging.
- . Better development and Organization of files:
E.g 1
Java libraries are arranged in such way that ,
all I/O
related functionality put inside ->
java.io package
Network related functionality put inside -> java.net
E.g
If you are developing a shopping cart application we want
different modules like
ProdcutDisplay, Promotions , ItemsPage, Checkout.
So during
development If we put each modules under each packages then it will be easy to
develop and organize.
abc.shoppingCart. ProdcutDisplay
abc.shoppingCart. Promotions
abc.shoppingCart. Checkout
If 3 people are working on this project so that they can
develop each module independently.
- . Resolve name conflict:
Every class contained in a package has a
unique name that cannot conflicts with class names defined in another packages.
E.g
2 companies A & B are developing
shopping cart application and they used identical name for their checkout
classes.
If they have used the packaging then name
conflict will not happen.
A. shoppingCart. Checkout
B. shoppingCart. Checkout
Creating Packages
in Java Programs:
Package is creating in java with ‘package’ keyword , which
is the first keyword in any java program followed by import statements.
package com.abc.shoppingcart;
If we want to use method of java classes you have to import
that. Java.lang package in imported implicitly by default.
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