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. Jan 10, 2012 · An important point to note here is that, while the String object is immutable, its reference variable is not. So that's why, in the above example, the reference was made to refer to a newly formed String object. 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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