Web Reference: Jul 23, 2025 · Example 1: The below Java program demonstrates the use of the capacity () method to check the initial capacity of a StringBuffer object. Note: By default, the initial capacity of a StringBuffer is 16 characters and it is same for the StringBuilder class as well. The Java StringBuffer capacity() method is a powerful tool for managing and optimizing string manipulation. By understanding the fundamental concepts, proper usage, common practices, and best practices related to this method, developers can write more efficient and performant code. The Java StringBuffer capacity () method returns the current capacity. The capacity is defined as the amount of storage available for newly inserted characters, beyond which an allocation will occur. In simple words, the default storage of an empty StringBuffer has a 16-character capacity.
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