did it, thanks Rachelle

src/main/java/com/zipcoder/payment/Check.java

@@ -0,0 +1,66 @@
+package com.zipcoder.payment;
+
+public class Check implements Payment {
+
+    Long id;
+    String payerName;
+    String routingNumber;
+    String accountNumber;
+
+    public Check(String payerName, String routingNumber, String accountNumber) {
+        this.payerName = payerName;
+        this.routingNumber = routingNumber;
+        this.accountNumber = accountNumber;
+    }
+
+    public Check() {
+    }
+
+    @Override
+    public String getPayerName() {
+        return payerName;
+    }
+
+    public void setPayerName(String payerName) {
+        this.payerName = payerName;
+    }
+
+    @Override
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getRoutingNumber() {
+        return routingNumber;
+    }
+
+    public void setRoutingNumber(String routingNumber) {
+        this.routingNumber = routingNumber;
+    }
+
+    @Override
+    public String getShortDescription() {
+        return "Check " + getPayerName() + " ***" + getLastFourDigits();
+    }
+
+    public String getLastFourDigits() {
+        return getAccountNumber().substring(accountNumber.length() - 4);
+    }
+
+    public String getAccountNumber() {
+        return accountNumber;
+    }
+
+    public void setAccountNumber(String accountNumber) {
+        this.accountNumber = accountNumber;
+    }
+
+    @Override
+    public int compareTo(Payment o) {
+      return this.getShortDescription().compareTo(o.getShortDescription());
+    }
+}

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

@@ -3,7 +3,7 @@ package com.zipcoder.payment;
 public class CreditCard implements Payment {
 
 
-    long id;
+    Long id;
     String payerName;
     String number;
     int expiredMonth;
@@ -13,6 +13,8 @@ public class CreditCard implements Payment {
     }
 
 
+
+
     public CreditCard(String payerName, String number, int expiredMonth, int expiredYear) {
         this.payerName = payerName;
         this.number = number;
@@ -21,11 +23,11 @@ public class CreditCard implements Payment {
     }
 
     @Override
-    public long getId() {
+    public Long getId() {
         return id;
     }
 
-    public void setId(long id) {
+    public void setId(Long id) {
         this.id = id;
     }
 
@@ -73,4 +75,8 @@ public class CreditCard implements Payment {
     }
 
 
+    @Override
+    public int compareTo(Payment o) {
+        return this.getShortDescription().compareTo(o.getShortDescription());
+    }
 }

src/main/java/com/zipcoder/payment/PayPal.java

@@ -0,0 +1,53 @@
+package com.zipcoder.payment;
+
+public class PayPal implements Payment {
+
+    Long id;
+    String payerName;
+    String email;
+
+    public PayPal(String payerName, String email) {
+        this.payerName = payerName;
+        this.email = email;
+    }
+
+    public PayPal() {
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    @Override
+    public String getPayerName() {
+        return payerName;
+    }
+
+    public void setPayerName(String payerName) {
+        this.payerName = payerName;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    @Override
+    public Long getId() {
+        return id;
+    }
+
+
+    @Override
+    public String getShortDescription() {
+        return "PayPal " + getPayerName() + " " + getEmail();
+    }
+
+    @Override
+    public int compareTo(Payment o) {
+        return this.getShortDescription().compareTo(o.getShortDescription());
+    }
+}

src/main/java/com/zipcoder/payment/Payment.java

@@ -1,8 +1,8 @@
 package com.zipcoder.payment;
 
-public interface Payment {
+public interface Payment extends Comparable<Payment> {
 
-    long getId();
+    Long getId();
 
     String getPayerName();
 

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

@@ -1,6 +1,35 @@
 package com.zipcoder.payment;
 
+import java.util.Arrays;
+import java.util.Comparator;
+
 public class PaymentPresenter {
 
 
+    public String toString(Payment[] payments) {
+        Arrays.sort(payments);
+        return formatMultipleDescriptions(payments);
+    }
+
+
+    public String formatMultipleDescriptions(Payment[] payments) {
+        StringBuilder sb = new StringBuilder();
+        for (Payment payment : payments) {
+            sb.append(payment.getShortDescription() + "\n");
+        }
+        return sb.toString();
+    }
+
+    public String toStringByPayerName(Payment[] payments) {
+        PaymentSortByPayer psbp = new PaymentSortByPayer();
+        Arrays.sort(payments, psbp);
+        return formatMultipleDescriptions(payments);
+
+    }
+
+    public String toStringBySetId(Payment[] payments) {
+        Comparator<Payment> compareById = ((o1, o2) -> o1.getId().compareTo(o2.getId()));
+        Arrays.sort(payments, compareById);
+        return formatMultipleDescriptions(payments);
+    }
 }

src/main/java/com/zipcoder/payment/PaymentSortByPayer.java

@@ -0,0 +1,11 @@
+package com.zipcoder.payment;
+
+import java.util.Comparator;
+
+public class PaymentSortByPayer implements Comparator<Payment>{
+
+    @Override
+    public int compare(Payment o1, Payment o2) {
+        return o1.getPayerName().compareTo(o2.getPayerName());
+    }
+}

src/test/java/com/zipcoder/payment/CheckTest.java

@@ -0,0 +1,74 @@
+package com.zipcoder.payment;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+public class CheckTest {
+    @Test
+    public void getIdTest() {
+        Check check = new Check();
+        check.setId(0123L);
+
+        long expected = 0123L;
+        long actual = check.getId();
+
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void getPayerNameTest() {
+        Check check = new Check();
+        check.setPayerName("Kris Blassingame");
+
+        String expected = "Kris Blassingame";
+        String actual = check.getPayerName();
+
+        assertEquals(expected, actual);
+    }
+
+
+    @Test
+    public void getRoutingNumberTest() {
+        Check check = new Check();
+        check.setRoutingNumber("123456789");
+
+        String expected = "123456789";
+        String actual = check.getRoutingNumber();
+
+        assertEquals(expected, actual);
+
+    }
+
+    @Test
+    public void getAccountNumberTest() {
+        Check check = new Check();
+        check.setAccountNumber("0000123456789");
+
+        String expected = "0000123456789";
+        String actual = check.getAccountNumber();
+
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void getShortDescriptionTest() {
+        Check check = new Check("Kris Blassingame", "123456789", "0000123456789");
+
+        String expected = "Check Kris Blassingame ***6789";
+        check.getShortDescription();
+
+        assertEquals(check.getShortDescription(), expected);
+
+    }
+
+    @Test
+    public void compareToTest() {
+        PayPal payPal = new PayPal("Tia Mowry", "tia@mowry.com");
+        Check check = new Check("Tia Mowry", "123456789", "0000123456789");
+
+        assertTrue(check.compareTo(payPal) < 0);
+
+    }
+}

src/test/java/com/zipcoder/payment/CreditCardTest.java

@@ -3,6 +3,7 @@ package com.zipcoder.payment;
 import org.junit.Test;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 
 public class CreditCardTest {
 
@@ -30,7 +31,7 @@ public class CreditCardTest {
     }
 
     @Test
-    public void getNumberTest(){
+    public void getNumberTest() {
         CreditCard creditCard = new CreditCard();
         creditCard.setNumber("1234567890123456");
 
@@ -41,7 +42,7 @@ public class CreditCardTest {
     }
 
     @Test
-    public void getExpiredMonthTest(){
+    public void getExpiredMonthTest() {
         CreditCard creditCard = new CreditCard();
         creditCard.setExpiredMonth(06);
 
@@ -52,7 +53,7 @@ public class CreditCardTest {
     }
 
     @Test
-    public void getExpiredYearTest(){
+    public void getExpiredYearTest() {
         CreditCard creditCard = new CreditCard();
         creditCard.setExpiredYear(2020);
 
@@ -63,7 +64,7 @@ public class CreditCardTest {
     }
 
     @Test
-    public void getShortDescriptionTest(){
+    public void getShortDescriptionTest() {
         CreditCard creditCard = new CreditCard("Kris Blassingame", "1234567890987654", 6, 2020);
 
         String expected = "CC Kris Blassingame 7654 6/2020";
@@ -73,7 +74,7 @@ public class CreditCardTest {
     }
 
     @Test
-    public void getLastFourDigitsTest(){
+    public void getLastFourDigitsTest() {
         CreditCard creditCard = new CreditCard();
 
         String expected = "7654";
@@ -81,4 +82,13 @@ public class CreditCardTest {
 
         assertEquals(expected, creditCard.getLastFourDigits());
     }
+
+    @Test
+    public void compareToTest() {
+        CreditCard creditCard = new CreditCard("Tia Mowry", "1111222233334444", 6, 2020);
+        CreditCard creditCard1 = new CreditCard("Tia Mowry", "2222333344445555", 6, 2020);
+        assertFalse(creditCard.compareTo(creditCard1) == 0);
+    }
+
+
 }

src/test/java/com/zipcoder/payment/PayPalTest.java

@@ -0,0 +1,60 @@
+package com.zipcoder.payment;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+public class PayPalTest {
+
+    @Test
+    public void getIdTest() {
+        PayPal payPal = new PayPal();
+        payPal.setId(6666L);
+
+        long expected = 6666;
+        long actual = payPal.getId();
+
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void getPayerNameTest() {
+        PayPal payPal = new PayPal();
+        payPal.setPayerName("Kris Blassingame");
+
+        String expected = "Kris Blassingame";
+        String actual = payPal.getPayerName();
+
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void getEmailTest() {
+        PayPal payPal = new PayPal();
+        payPal.setEmail("krisblassingame@gmail.com");
+
+        String expected = "krisblassingame@gmail.com";
+        String actual = payPal.getEmail();
+    }
+
+    @Test
+    public void getShortDescriptionTest() {
+        PayPal payPal = new PayPal("Kris Blassingame", "krisblassingame@gmail.com");
+
+        payPal.getShortDescription();
+        String actual = "PayPal Kris Blassingame krisblassingame@gmail.com";
+
+        assertEquals(payPal.getShortDescription(), actual);
+
+
+    }
+    @Test
+    public void compareToTest() {
+        PayPal payPal = new PayPal("Tia Mowry", "tia@mowry.com");
+        Check check = new Check("Tia Mowry", "123456789", "0000123456789");
+
+        assertTrue(payPal.compareTo(check) > 0);
+
+    }
+}

src/test/java/com/zipcoder/payment/PaymentPresenterTest.java

@@ -1,4 +1,73 @@
 package com.zipcoder.payment;
 
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
 public class PaymentPresenterTest {
+
+    @Test
+    public void toStringEmptyTest() {
+        Payment[] payments = new Payment[0];
+        PaymentPresenter pp = new PaymentPresenter();
+        String expected = "";
+
+        String actual = pp.toString(payments);
+
+        assertEquals(expected, actual);
+
+    }
+
+    @Test
+    public void toStringMultipleTest() {
+        Payment[] payments = new Payment[2];
+        Payment paypal = new PayPal("Tia Mowry", "tia@mowry.com");
+        Payment check = new Check("Tia Mowry", "114325433", "0000134344551");
+
+        payments[0] = paypal;
+        payments[1] = check;
+
+        PaymentPresenter presenter = new PaymentPresenter();
+        String expected = "Check Tia Mowry ***4551\nPayPal Tia Mowry tia@mowry.com\n";
+
+        String actual = presenter.toString(payments);
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void toStringByPayerNameTest() {
+        Payment[] payments = new Payment[2];
+        Payment paypal = new PayPal("Tamara Mowry", "tamara@mowry.com");
+        Payment check = new Check("Tia Mowry", "114325433", "0000134344551");
+
+        payments[0] = paypal;
+        payments[1] = check;
+
+        PaymentPresenter presenter = new PaymentPresenter();
+        String expected = "PayPal Tamara Mowry tamara@mowry.com\nCheck Tia Mowry ***4551\n";
+
+        String actual = presenter.toStringByPayerName(payments);
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void toStringBySetIdTest() {
+        Payment[] payments = new Payment[2];
+        PayPal payPal = new PayPal("Tamara Mowry", "tamara@mowry.com");
+        Check check = new Check("Tia Mowry", "11432543", "134344551");
+        payPal.setId(1L);
+        check.setId(2L);
+        payments[0] = payPal;
+        payments[1] = check;
+
+
+        PaymentPresenter presenter = new PaymentPresenter();
+        String expected = "PayPal Tamara Mowry tamara@mowry.com\nCheck Tia Mowry ***4551\n";
+
+        String actual = presenter.toStringBySetId(payments);
+        assertEquals(expected, actual);
+
+
+    }
 }
+

src/test/java/com/zipcoder/payment/PaymentSortByPayerTest.java

@@ -0,0 +1,16 @@
+package com.zipcoder.payment;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+public class PaymentSortByPayerTest {
+    @Test
+    public void compareToTest() {
+        PaymentSortByPayer psbp = new PaymentSortByPayer();
+        CreditCard creditCard = new CreditCard("Tia Mowry", "1111222233334444", 6, 2020);
+        CreditCard creditCard1 = new CreditCard("Tia Mowry", "2222333344445555", 6, 2020);
+        assertTrue(psbp.compare(creditCard, creditCard1) == 0);
+    }
+}