In the Java Logging API (java.util.logging), a Formatter is used to convert a LogRecord into a human-readable string. Formatters decide how log messages appear—e.g., timestamped lines, JSON, XML, or custom formats.
Formatters are essential when logs need to be stored, shared, or visualized clearly.
- Customize log output format
- Apply consistent structure across handlers (e.g., console, file)
- Improve readability, debugging, or machine parsing of logs
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Formatter