The StringBuffer class in Java is a part of the java.lang package and provides a mutable sequence of characters, unlike the String class which is immutable. This means that when you modify a StringBuffer object, the original object is changed rather than creating a new one. One of the key features of StringBuffer is that it is synchronized, making it thread-safe and suitable for use in multithreaded environments. This is especially useful when multiple threads might be modifying the same sequence of characters. The class provides a variety of methods that allow you to manipulate the content efficiently, such as appending, inserting, deleting, and replacing characters
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StringBuffer class