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. Jan 8, 2024 · Java String Pool is the special memory region where Strings are stored by the JVM. Since Strings are immutable in Java, the JVM optimizes the amount of memory allocated for them by storing only one copy of each literal String in the pool.
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