Create a class CharacterClassStringClass. Ask the user to type 'y' for yes or 'n' for no. Read the input as String and test if the user type Y\y or N\n which are OK we display the message (you typed ' ' thank you!) If the user enters any other character except y,Y, N, n display the message (you typed ' ' incorrect character! If the user enters numeric input display the message (you typed ' ' incorrect and numeric!) If the user enters a string whose length is greater than 1 we display the message (you typed more than 1 character ' ' incorrect length)

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Methods of StringBuilder class

The StringBuilder class can be used to create mutable strings. The methods defined in the StringBuilder class are widely used to manipulate and concatenate strings. It is a non-synchronized class which has public methods that can be accessed by multiple threads. It is not thread-safe.