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

package com.zipcoder.payment;

import java.util.Arrays;
import java.util.Comparator;

public class PaymentPresenter {

    public String toString(Payment[] payments) {
        //Comparator<Payment> shortDescComp = (p1, p2) -> p1.getShortDescription().compareTo(p2.getShortDescription());
        Arrays.sort(payments, new PaymentSortByShortDescription());
        return createArrayString(payments);
    }

    public String toStringByPayerName(Payment[] payments) {
        Arrays.sort(payments, new PaymentSortByPayer());
        return createArrayString(payments);
    }

    public String toStringById(Payment[] payments) {
        Arrays.sort(payments, new PaymentSortById());
        return createArrayString(payments);
    }

    private String createArrayString(Payment[] payments) {
        StringBuilder paymentStringBuilder = new StringBuilder();
        for (Payment payment : payments) {
            paymentStringBuilder.append(payment.getShortDescription() + "\n");
        }
        return paymentStringBuilder.toString();
    }
}