Web Reference: Nov 19, 2025 · In Java, the StringBuilder class (part of the java.lang package) provides a mutable sequence of characters. Unlike the String class (which is immutable), StringBuilder allows modification of character sequences without creating new objects, making it memory-efficient and faster for frequent string operations. As we discussed previously that strings are immutable, which means the methods that operate on strings cannot change the value of strings, instead a new memory is allocated every time. For example, when performing string concatenation using += operator, a new memory is allocated to store the concatenated string. On the other hand, StringBuilder is ... I'm not familiar enough with the Java garbage collector, but I would think that freeing and no reallocation (unless your next string grows the StringBuilder) is more beneficial than instantiation.
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