Java Programming:

Write Java Class IsLetterWord with following members:

• Create default constructor that sets the instance variable 'stringword' to the string "defaultstring".
• Create parameterized constructor that accepts one String object as a parameter and stores it in the instance variable. The String must consist only of letters: no whitespace, digits, or punctuation. If the String parameter does not consist only of letters, set the instance variable to "defaultstring" instead.
• A method String toString() that returns the instance variable.
• NOTES:
• MUST Use "isletter()"
• MUST NOT use Regex/Regular Expressions or "matches()"