This document discusses Java packages. It defines a package as a way to group related classes, interfaces, and sub-packages. There are two types of packages - predefined packages that come with Java, and user-defined packages created by the programmer. Packages can be created using the package keyword and accessed using import statements. Packages provide advantages like reusability, security, and preventing naming conflicts, but also have disadvantages like not being able to pass parameters to packages.

1. Java Technology
Centurion univercity of Technology and
Management
Name:- Abhijit Patra
Branch:- EEE
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Packages in java

2. Conclusion
TABLE OF CONTENTS:-
Advantage and Disadvantage
Creation of Packages
Access Modifier
Classification
Introduction

3. Package
A package arrange number of classes interfaces and sub-packages of same type
into a particular group. In simple word we can say that Package is nothing but folder
in windows.
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Video2.mp4
Song
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4. Classification
Java Packages are classified into two type
(i)Pre defined package
(ii)User defined package
(i)Pre defined package:-
Java
lang util io awt net applet
(ii)User defined package :-
 Package Add
 package MyPackage

5. Access Modifier
Access modifier Within
class
Within package Outside package by
subclass
Outside
package
Private Yes No No No
Public Yes Yes Yes Yes
Protected Yes Yes Yes No
Default Yes Yes No No

6. Package creation
For creating Package
First statement
package package name;
To Compile: javac -d . Simple.java
1.To Run: java mypack.Simple
2.Output: Welcome to package

7. access package
import package.*;
 If we use package.* then all the classes and interfaces of this package will be accessible but not sub
packages.
 The import keyword is used to make the classes and interface of another package accessible to the
current package
Output:Hello

8. import package.classname;
If we import package.classname then only declared class of this package will be accessible.
Output: Hello
access package

9. Advantage and Disadvantage
Advantage:-
Disadvantage:-
Reusability
Security
Fast searching
Naming Conflicting
Hiding
We can not pass parameter to package

10. Conclusion
Ability to reuse the code within the same programs is achieved in oops by
means of extending and implementing. Including this property java also provides a
mechanism, that is reuse of the code out side the program without physical copy, is
achieved by sing packages.

11. THANK YOU