Java String Case Conversion – Methods & Examples
Published 2026-01-29 · convertcase.in
Java's String class provides methods for basic case conversion. For more advanced scenarios, libraries like Apache Commons Text or Google Guava can help.
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1Built-in Java Methods
"HELLO".toLowerCase() → "hello" "hello".toUpperCase() → "HELLO"
2Locale-Aware Conversion
"HELLO".toLowerCase(Locale.ENGLISH) — always use Locale to avoid issues with Turkish "I".
3Apache Commons: WordUtils
WordUtils.capitalizeFully("hello world") → "Hello World"
WordUtils.capitalize("hello world") → "Hello World"Frequently Asked Questions
Does Java have a built-in title case method?
No. Use Apache Commons WordUtils.capitalizeFully() or write a custom method.