Write a program that prompts the user to enter a string and changes its first character to uppercase if it is lowercase, and its last character to lowercase if it is uppercase, and print out the new string. You must use the String Subscript Operator • For example, if the user enters the following string: reginA, your program should print out: Regina

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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.