Help with Java Class

How do I:

Update the class so that it implements interface IDie

TIP: Use Netbeans right click menu, Insert Code, Implement Method to have the IDE generate the methods for you; you will replace the throw exception statements with the source code you write

Add member variable of type:

ArrayList // stores dice data for the sides of the die

TIP: member variables should have an access level modifier of private to protect the data

Implement method addLetter; the method should:

Add the parameter to the ArrayList representing the letters on the die

Implement method displayAllLetters; the method should:

Use an enhanced for loop to output the letter on each of the six sides of the die