Web Reference: StringBuffer has a char [] in which it keeps the strings that you append to it. The amount of memory currently allocated to that buffer is the capacity. The amount currently used is the length. Taken from the official J2SE documentation. Jul 23, 2025 · In Java, the capacity () method is used in the StringBuilder and StringBuffer classes to retrieve the current capacity of the object. The capacity is the amount of space that has been allocated to store the string that can grow dynamically as needed. Every string buffer has a capacity. As long as the length of the character sequence contained in the string buffer does not exceed the capacity, it is not necessary to allocate a new internal buffer array. If the internal buffer overflows, it is automatically made larger.
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