StringBuilder

A class for efficiently building or changing a sequence of characters.

What is StringBuilder in Java?

StringBuilder — A class for efficiently building or changing a sequence of characters.

class MessageBuilder {
    String buildMessage() {
        StringBuilder message = new StringBuilder("Order");
        message.append(" ready");
        return message.toString();
    }
}

Level: Apprentice · More Java terms at this level

Updated September 27, 2026