/*****************************************************************
 * Die
 *
 * Member Variables: 
 *    int face - represents the side of the die that is face-up
 *
 * Private Methods: none
 *
 * Public Methods: 
 *    Die() - constructor to initially set the value of face
 *    int getFace() - returns the die's face value
 *    void roll() - chooses a random value for the face
 ****************************************************************/
public class Die
{
    // The data member face is an integer that can take the
    // values 1-6.
    private int face;

    /*******************************************
     * Die Constructor
     *
     * - Takes no parameters
     * - Gives face an initial value
     *******************************************/
    public Die()
    {
        // Since the only data member is a primitive data
        // type, there is nothing to instantiate.  But, we
        // do need to initialize the variable.  We could give
        // it an arbitrary value between 1-6, but it is better
        // to go ahead an pick a random value.  We already have
        // code written to set face to a random integer between
        // 1-6, so let's just use it.  Since we are in the Die
        // class, we do not need to reference the class or a
        // specific object in order to call the method -- just
        // give the method name.
        roll();
    }

    /*******************************************
     * getFace
     *
     * - Takes no parameters
     * - Returns the face value of the Die object
     *******************************************/
    public int getFace()
    {
        // Since the data member face is private, any class
        // outside of Die must call getFace() to find out
        // the face value of the object.
        return face;
    }

    /*******************************************
     * roll
     *
     * - Takes no parameters
     * - Returns nothing
     * - Sets the data member face to a random
     *   integer between 1-6.
     *******************************************/
    public void roll()
    {
        // roll the die (choose a random int 1-6)
        face = ((int) (Math.random() * 6)) + 1;
        // Be sure to use just face here, instead of
        // int face.  Using int face = ... will create
        // a new variable named face and will NOT change
        // the value of the data member face.
    }
} // end of Die class