Web Reference: Oct 10, 2025 · In Java, strings are immutable, meaning their values cannot be changed once created. If you try to modify a string (e.g., using concat () or replace ()), a new string object is created instead of altering the original one. 1 Actually, it is possible to mutate strings (and other immutable objects). It requires reflection and is very, very dangerous and should never ever be used unless you're actually interested in destroying the program. The class String includes methods for examining individual characters of the sequence, for comparing strings, for searching strings, for extracting substrings, and for creating a copy of a string with all characters translated to uppercase or to lowercase.
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