How is StringBuffer implementing append function without creating two objects?

Question

It was an interview question. I was asked to implement the StringBuffer append function. I saw the code after the interview. But I cannot understand how the operati

Answer 1

StringBuffer, like StringBuilder allocates an array of char into which it copies the strings you append. It only creates new objects when the number of characters exceeds the size of the array, in which case it reallocates and copies the array.