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Packages

A package in Java is a namespace that organizes classes and interfaces to enhance code management, modularity, and reusability. Key features include organization, access control, namespace management, and reusability. To create and use a package, developers declare it in the Java file, compile it into a directory structure, and import it in other programs as needed.

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3 views1 page

Packages

A package in Java is a namespace that organizes classes and interfaces to enhance code management, modularity, and reusability. Key features include organization, access control, namespace management, and reusability. To create and use a package, developers declare it in the Java file, compile it into a directory structure, and import it in other programs as needed.

Uploaded by

Tamilselvi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Definition of Packages: A package in Java is a namespace that organizes classes and

interfaces. It helps manage the code by grouping related classes together, avoiding naming
conflicts, and enabling better modularity and reusability.

Key Features of Packages:

1. Organization: Helps group similar classes and interfaces.


2. Access Control: Enables controlled access using access modifiers (e.g., public,
protected).
3. Namespace Management: Avoids naming conflicts by providing unique
namespaces.
4. Reusability: Encourages reusability of code across projects.

Creating a Package: To create a package:

1. Declare the package at the top of the Java file using the package keyword.
2. Compile the file to place it in a directory structure matching the package name.

Example:

// File: MyPackage/MyClass.java
package MyPackage;
public class MyClass {
public void displayMessage() {
System.out.println("Hello from MyPackage!");
}
}

After compiling, the directory structure will look like MyPackage/MyClass.class.

Importing User-Defined Packages: To use a package in another program:

1. Import the package using the import keyword.


2. Use fully qualified names if not importing explicitly.

Example:

import MyPackage.MyClass;
public class Main {
public static void main(String[] args) {
MyClass obj = new MyClass();
obj.displayMessage();
}
}

Java Application Programming Interface (API):


 Java provides a rich set of built-in libraries (Java API) organized into packages like
java.util, java.io, etc.
 Developers can also create custom APIs by defining reusable packages, promoting
modularity and efficient application development.

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