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Unit 4: Package Organization

This project demonstrates professional Java package organization and import management.

Project Structure

unit-4-work/
├── src/main/java/
│   └── com/
│       └── example/
│           ├── model/
│           │   ├── Product.java
│           │   └── DigitalProduct.java
│           └── main/
│               └── Store.java
├── README.md
└── .gitignore

Learning Objectives

  • Understand Java package organization
  • Learn proper package naming conventions
  • Master import statements and dependencies
  • Organize code for professional development
  • Prevent naming conflicts through packages

How to Run

  1. Compile all Java files:

    javac src/main/java/com/example/model/*.java src/main/java/com/example/main/*.java

  2. Run the Store application:

    java -cp src/main/java com.example.main.Store

Package Structure

com.example.model

Contains all data model classes:

  • Product: Base product class with encapsulation
  • DigitalProduct: Extended product class with inheritance

com.example.main

Contains application entry point:

  • Store: Main class demonstrating package usage and imports

Key Concepts

  • Package Declaration: package com.example.model;
  • Import Statements: import com.example.model.Product;
  • Fully Qualified Names: com.example.model.Product
  • Package Organization: Logical grouping of related classes
  • Namespace Protection: Preventing naming conflicts

Professional Benefits

  1. Clear Organization: Related classes grouped together
  2. Namespace Protection: No naming conflicts between packages
  3. Import Management: Clear dependencies between packages
  4. Scalability: Easy to add new packages and classes
  5. Industry Standards: Professional Java development practices