Web Reference: Jul 11, 2025 · Java String toUpperCase (Locale locale) The toUpperCase (Locale locale) method returns a new String object which is the original string in upper case with respect to the Locale method parameter. Definition and Usage The toUpperCase() method converts a string to upper case letters. Note: The toLowerCase () method converts a string to lower case letters. Jan 8, 2024 · In conclusion, the Java String class includes the toUpperCase and toLowerCase methods for changing the case of a String. If needed, a Locale can be supplied to provide locale-specific rules when changing the case of a String. The code backing this article is available on GitHub.
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