Packages and Imports

As our application grows, keeping all files in a single folder becomes difficult to manage. Imagine a library where every book is added to a single pile. Finding “The Great Gatsby” would be impractical once the collection grows large.

In Java, we solve this problem using packages, which group related code together, much like shelves in a library that group related books. By organizing classes into packages, we can keep large applications manageable and avoid name conflicts, e.g., having two different classes both named User coming from different parts of an application.

Organizing code with packages

A package is a namespaceNamespace is a unique container that prevents naming conflicts. Think of it like a surname: just as ‘John Smith’ and ‘John Doe’ are different people, com.google.User and com.amazon.User are different classes. that groups related types. It prevents naming conflicts and controls access to code. When we declare a package at the top of a Java file, we are telling the compiler exactly where this class lives in the project hierarchy.

This organization is especially useful for utility classes, which contain static helper methods (such as Math or Collections) that don’t require instantiation. By placing these utilities in a dedicated package (e.g., ...