// import <package>         -> Imports the whole package

// import <package>.<class> -> Imports a certain class

import java.util.Scanner;

Package is a mechanism to group related classes ,interfaces and enums 

in to a single module.

Package can be declared using the following statement :

Syntax : package <package-name>

Coding Convention : package name should be declared in small letters.

package statement defines the namespace.

The main use of package is

1) To resolve naming conflicts

2) For visibility control : We can define classes and interfaces that are 

not accessible outside the class

Do not use the default package for real applications. 

It is perfectly fine for simple, educational applications, 

like "Hello world", but more complex projects will be better in named packages.

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