Packages

They are simple containers group the classes.

Two types-->

Userdefined(Written by developer) and build in (prewritten packages)packages.

Package name must be unique,lowercase.

EG: package.subpackage.anothersubpackage

import com.imdb.database.*;-->can use all the classes from this package.

Two classes with the same name .

import java.util.Date;

import java.sql.Date;

Dont use import all ,import only necessary class.