Web Reference: Sep 6, 2017 · The length is the actual size of the string stored in the builder, and the capacity is the maximum size that it can currently fit. The builder’s capacity is automatically increased if more characters are added to exceed its capacity. Every string builder has a capacity. As long as the length of the character sequence contained in the string builder does not exceed the capacity, it is not necessary to allocate a new internal buffer. 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.
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