In Java, data formats refer to the structured representation of data for storage or communication. Commonly used data formats include:

​

JSON (JavaScript Object Notation): Lightweight, text-based format for exchanging data.

​

Library: Jackson, Gson

Example: {"name": "John", "age": 30}

XML (Extensible Markup Language): Hierarchical, tag-based format.

​

Library: JAXB, DOM, SAX

Example: <person><name>John</name><age>30</age></person>

CSV (Comma-Separated Values): Tabular data in plain text.

​

Library: Apache Commons CSV

Example: John,30

These formats are commonly used for file I/O, API communication, or data serialization.