Web Reference: Definition and Usage The toUpperCase() method converts a string to upper case letters. Note: The toLowerCase () method converts a string to lower case letters. Jul 11, 2025 · Java String toUpperCase () method of String class is used to convert all characters of the string into an uppercase letter. Example: Note: Lowercase is done using the rules of the given Locale. There is 2 variant of toUpperCase () method. The toUpperCase () method converts all the characters in a string into their upper case. This method returns a new string where every lowercase letter has been replaced by its uppercase equivalent.
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