Packages in Java: Why Your Code Needs a Home Address

Short summary

A beginner-friendly tutorial explaining Java packages as namespaces that prevent name collisions, enable access control, and improve code discoverability. It covers reverse-domain naming conventions, the four access levels (especially package-private), and why the default package is dangerous in production. Includes a practical ecommerce project structure example.

• •Packages solve name collisions, provide access control, and improve discoverability
• •Use reverse-domain naming (e.g., dev.jamilur.ecommerce.model) in all lowercase
• •Avoid the default package in production—it cannot be imported by named packages

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