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MasterCard.java

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package net.threebit.utils.sosc ; 

public class MasterCard extends CreditCard
{   
        public MasterCard(final String mastercard)
        {        
                super(mastercard, "MasterCard");
        }

        public boolean equals(final Object o)
        {
                if (!(o instanceof MasterCard))
                {
                        return (false);
                }
                return (super.equals(o));
        }

        protected boolean checkSize()
        {                
                return(16 == (number.length()));
        }

        protected boolean checkPrefix()
        {
                final int prefix;
                prefix = (((number.charAt(0) - '0') * 10) + (number.charAt(1) - '0')); 
                return ((prefix > 50) && (prefix < 56));
        }

        public static boolean validate(String num)
        {
                return(new MasterCard(num).validate());
        }
}

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