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Java String First Letter Capitalization Methods

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Problem Description: Java's String.toUpperCase() converts all letters to uppercase
Tutorial demonstrates converting first character only to uppercase
Empty input strings should return empty result
Solutions: First approach uses substring() to split string into two parts
Second approach employs Matcher.replaceAll() with regex
Third approach utilizes Apache Commons Lang3's StringUtils.capitalize()
Implementation Details: Substring approach fails for empty strings and null inputs
Matcher.replaceAll() works for empty strings since Java 9
StringUtils.capitalize() is null-safe and works for empty strings
All solutions require null checks before use