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Packages And Interfaces

1.0 Introduction:

Packages :are containers for classes. Packages help in avoiding naming conflicts. For example, if you store a class named List in one package, another person can store a class again named as List, but in another package. In other words a package is nothing but a name space(where names are stored, such as names of a class etc).

Interfaces :So far we have seen methods  that act as interfaces to the data in the class.

Through the use of the key word interface, one can abstract the, interface with out implementation.

Using interface key word, we can specify a set of methods  which can be implemented by one or more classes.

The interface, itself, does not actually define any implementation.

Although an interface, is similar to an abstract class but the advantage with interface is, a class can implement more than one interface but where as a class can only inherit, one abstract class as, super class. 

By now, we should have known that a java source file can contain any (or all)  of the following:

A single package statement (optional).
Any number of import statements(optional).
A single public class declaration(required).
Any number of classes private to the package(optional).

2.0 Packages :

We can define classes

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