Find out the methods missing in StringBuffer and StringBuilder , which is given in String?

equals() : Compares two strings. Returns true if the strings are equal, and false if not .

toLowerCase() : Converts a string to lower case letters.

toUpperCase() : Converts a string to upper case letters.

isEmpty() : Checks whether a string is empty or not.

equals() : Compares two strings. Returns true if the strings are equal, and false if not .

compareTo() : Compares two strings lexicographically (Alphabetical order).