Web Reference: This lesson explains how to bundle classes and interfaces into packages, how to use classes that are in packages, and how to arrange your file system so that the compiler can find your source files. Nov 21, 2025 · A package in Java is a mechanism to group related classes, interfaces, and sub-packages into a single unit. Packages help organize large applications, avoid naming conflicts, provide access protection, and make code modular and maintainable. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.
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