Packages

Organizing classes into namespaces

5 min read

Packages in Java

A package is a namespace that groups related classes and interfaces. It helps avoid name conflicts and improves code organization.

Key Idea: Package = folder for classes.

Code Examples

Defining a class inside a package

java
1
2package com.company.project.service;
3
4public class UserService {
5    public void createUser() {
6        System.out.println("User created");
7    }
8}
9

Use Cases

  • Organizing large applications
  • Avoiding class name conflicts
  • Access control using packages

Common Mistakes to Avoid

  • Not matching folder structure with package name
  • Using default package in large projects