The StringBuilder class in Java, introduced in Java 5, is designed to represent a mutable sequence of characters. Unlike the String class, which creates immutable objects, StringBuilder allows you to modify the character sequence without creating new objects, making it more efficient for frequent string manipulations. A key difference between StringBuilder and StringBuffer is that StringBuilder is not synchronized, meaning it is not thread-safe but provides better performance in single-threaded environments due to the absence of synchronization overhead. This makes StringBuilder the preferred choice when you do not need thread safety but want fast and efficient string modifications.
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StringBuilder class