Java Package

Class -Bsc CS II year

Subject- Object Oriented Programming using Java

Subject type-Major I

Compiled by-Asst Professor Sulochana Patidar 

Java Packages

A package in Java is a mechanism to group related classes, interfaces, and sub-packages into a single unit. Packages help organize large applications, avoid naming conflicts, provide access protection, and make code modular and maintainable.

Avoiding name conflicts (two classes with the same name can exist in different packages)

Providing access control using public, protected, and default access

Reusability: packaged code can be imported and used anywhere

Encouraging modular programming

Types of Java Packages

packages_

Types of Package

1. Built-in Packages

Built-in Packages comprise a large number of classes that are part of the Java API. Some of the commonly used built-in packages are:

java.lang: Contains language support classes(e.g, classes that define primitive data types, math operations). This package is automatically imported.

java.io: Contains classes for supporting input/output operations.

java.util: Contains utility classes that implement data structures such as Linked Lists and Dictionaries, as well as support for date and time operations.

java.applet: Contains classes for creating Applets.

java.awt: Contains classes for implementing the components for graphical user interfaces (like buttons, menus, etc). 

2. User-defined Packages

User-defined Packages are the packages that are defined by the user.