Web Reference: Package java.util Contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes (a string tokenizer, a random-number generator, and a bit array). Jan 31, 2026 · Java provides a rich set of built-in packages that contain predefined classes and interfaces to perform common programming tasks. These packages help developers write efficient, reusable, and reliable code without having to build everything from scratch. The Java API is a library of prewritten classes, that are free to use, included in the Java Development Environment. The library contains components for managing input, database programming, and much much more.
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