InterfaceComparableLab/src/main/java/com/zipcoder/payment/CreditCard.java

package com.zipcoder.payment;

public class CreditCard implements Payment {

    Long id;
    String payerName;
    String number;
    int expiredMonth;
    int expiredYear;

    public CreditCard(){}

    public CreditCard(String payerName, String number, int expiredMonth, int expiredYear){
        this.payerName = payerName;
        this.number = number;
        this.expiredMonth = expiredMonth;
        this.expiredYear = expiredYear;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getPayerName() {
        return payerName;
    }

    public void setPayerName(String payerName) {
        this.payerName = payerName;
    }

    public String getNumber() {
        return number;
    }

    public void setNumber(String number) {
        this.number = number;
    }

    public int getExpiredMonth() {
        return expiredMonth;
    }

    public void setExpiredMonth(int expiredMonth) {
        this.expiredMonth = expiredMonth;
    }

    public int getExpiredYear() {
        return expiredYear;
    }

    public void setExpiredYear(int expiredYear) {
        this.expiredYear = expiredYear;
    }

    public Long getID() {
        return null;
    }

    public String getShortDescription() {
        String result = "CC " + getPayerName() + " " + getLastFourDigits() + " " + getExpiredMonth() + "/" + getExpiredYear();
        return result;
    }

    public String getLastFourDigits(){
        String lastFour = number.substring(number.length()-4);
        return lastFour;
    }

}