In Java, when should you use StringBuffer/StringBuilder instead of String?

• Objects of the String class are immutable, while objects of the StringBuffer and StringBuilder classes are mutable.
• StringBuffer is synchronous, while StringBuilder is asynchronous.
• The concatenation operator " " is implemented internally using StringBuffer or StringBuilder.
• If the value of the object will not change, please use the String class because String objects are immutable.
• If the object's value can change and can only be accessed from a single thread, use StringBuilder because StringBuilder is asynchronous.
• If the value of the object can change and will be modified by multiple threads, use StringBuffer because StringBuffer is synchronized.

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