Packages

A Java package is a process for managing Java classes into namespaces exchangeable to the modules of Modula. Java packages can be laid in compressed files called JAR files, allow classes to download faster as a group (than one at a time). Programmers typically use packages to arrange classes belonging to the similar category or functionality.

A package renders a unique namespace for the types it contains. Classes in the similar package can access each other's package-access members. A package permits a developer to group classes and interfaces together. These classes can be related in some way.

Interfaces
In the Java programming language, an interface is an abstract type applied to specify an interface that is implemented by classes. Interfaces are declared using the interface keyword, may only contain constant declarations (variable declarations which are declared to be both final and static) and method signature. A class that applies an interface must implement all of the methods set in the interface or can be an abstract class. Object references in Java may be determined to be of an interface type, in case they must either be null or be bound to an object that implements the interface.

Interfaces are simulating multiple inheritances. All classes in Java must have precisely one base class, the only exception being java.lang.Object (is the root class of the Java type system), multiple inheritances of classes is not allowed.

A Java class may enforce an interface which can extend to any number of interfaces, whereas an interface may not carry out an interface.

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