InterfaceComparableLab/src/main/java/PaymentPresenter.java

import java.util.*;

public class PaymentPresenter {


    public String toString(Payment[] payments) {
        Arrays.sort(payments);

        StringBuilder string = new StringBuilder();
        for (Payment o : payments) {

            string.append(o.getShortDescription() + "\n");
        }


        return string.toString();


    }

    public String toStringByPayerName(Payment[] payments) {
        Arrays.sort(payments, new paymentSortByPayer());

        StringBuilder string = new StringBuilder();
        for (Payment o : payments) {

            o.getPayerName();

            string.append(o.getShortDescription() + "\n");
        }
        return string.toString();
    }

    public String toStringById(Payment[] payments) {
        Arrays.sort(payments, (Payment a, Payment b) -> Long.compare(a.getId(), b.getId()));

        StringBuilder string = new StringBuilder();
        for (Payment o : payments) {


            string.append(o.getShortDescription() + "\n");
        }
        return string.toString();
    }
}