pom.xml

     <groupId>com.zipcoder</groupId>
     <artifactId>payment</artifactId>
     <version>1.0-SNAPSHOT</version>
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>RELEASE</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
     <properties>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>

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

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

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

+package com.zipcoder.payment;
+
+public class CreditCard implements Payment{
+
+    private Long Id;
+    private String payerName;
+    private String number;
+    private int expiredMonth;
+    private int expiredYear;
+
+    public CreditCard(Long Id, String payerName, String number, int expiredMonth, int expiredYear) {
+        this.Id = Id;
+        this.payerName = payerName;
+        this.number = number;
+        this.expiredMonth = expiredMonth;
+        this.expiredYear = expiredYear;
+    }
+
+    @Override
+    public Long getId() {
+        return Id;
+    }
+
+    @Override
+    public String getPayerName() {
+        return payerName;
+    }
+
+    @Override
+    public String getShortDescription() {
+        return "CC " + getPayerName() + " " + getNumber().substring(getNumber().length() -4)
+                + " " + getExpiredMonth() + "/" + getExpiredYear();
+    }
+
+    public void setId(Long ID) {
+        this.Id = ID;
+    }
+
+    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;
+    }
+
+    @Override
+    public int compareTo(Payment o) {
+       return 0;
+    }
+}

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

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

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

+package com.zipcoder.payment;
+
+import java.util.Comparator;
+
+public interface Payment extends Comparable<Payment> {
+
+    Long getId();
+
+    String getPayerName();
+
+    String getShortDescription();
+}

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

 
 public class PaymentPresenter {
 
+    PaymentSortByPayer sorter = new PaymentSortByPayer();
+
+    public String toString(Payment[] payments) {
+
+        String output = "";
+
+        if(payments.length > 0) {
+            payments = sorter.compareArray(payments);
+            for(Payment p: payments) {
+                output += p.getShortDescription() + "\n";
+            }
+        }
+
+        return output.trim();
+    }
+
+    public String toStringByPayerName(Payment[] payments) {
+
+        String output = "";
+
+        if(payments.length > 0) {
+            payments = sorter.compareArrayByName(payments);
+            for(Payment p: payments) {
+                output += p.getShortDescription() + "\n";
+            }
+        }
+
+        return output.trim();
+    }
+
+    public String toStringById(Payment[] payments) {
+
+        String output = "";
+
+        if(payments.length > 0) {
+            payments = sorter.compareArrayById(payments);
+            for(Payment p: payments) {
+                output += p.getShortDescription() + "\n";
+            }
+        }
+
+        return output.trim();
+    }
 
 }

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

+package com.zipcoder.payment;
+
+import java.util.Comparator;
+
+public class PaymentSortByPayer implements Comparator<Payment> {
+
+    @Override
+    public int compare(Payment o1, Payment o2) {
+        return o1.compareTo(o2);
+    }
+
+    public int compareByName(Payment o1, Payment o2) {
+        return o1.getPayerName().compareTo(o2.getPayerName());
+    }
+
+    public int compareById(Payment o1, Payment o2) {
+        return o1.getId().compareTo(o2.getId());
+    }
+
+    public Payment[] compareArray(Payment[] payments) {
+        for (int i = 0; i < payments.length - 1; i++) {
+            for (int j = 0; j < payments.length - 1; j++) {
+                if(compare(payments[j], payments[j+1]) > 0) {
+                    Payment temp = payments[j];
+                    payments[j] = payments[j+1];
+                    payments[j+1] = temp;
+                }
+            }
+        }
+        return payments;
+    }
+
+    public Payment[] compareArrayByName(Payment[] payments) {
+        for (int i = 0; i < payments.length - 1; i++) {
+            for (int j = 0; j < payments.length - 1; j++) {
+                if(compareByName(payments[j], payments[j+1]) > 0) {
+                    Payment temp = payments[j];
+                    payments[j] = payments[j+1];
+                    payments[j+1] = temp;
+                }
+            }
+        }
+        return payments;
+    }
+
+    public Payment[] compareArrayById(Payment[] payments) {
+        for (int i = 0; i < payments.length - 1; i++) {
+            for (int j = 0; j < payments.length - 1; j++) {
+                if(compareById(payments[j], payments[j+1]) > 0) {
+                    Payment temp = payments[j];
+                    payments[j] = payments[j+1];
+                    payments[j+1] = temp;
+                }
+            }
+        }
+        return payments;
+    }
+}

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

+package com.zipcoder.payment;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+public class CheckTest {
+
+    Check check1;
+    Check check2;
+
+    @Before
+    public void setup(){
+        check1 = new Check(1L,"Kris","12345","1111");
+        check2 = new Check(2L,"Kate","56789","2222");
+    }
+
+    @Test
+    public void testId(){
+        check1.setId(3L);
+
+        Long expected = 3L;
+        Long actual = check1.getId();
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testName(){
+        check1.setPayerName("Jevit");
+
+        String expected = "Jevit";
+        String actual = check1.getPayerName();
+        Assert.assertEquals(expected,actual);
+    }
+
+    @Test
+    public void testAccountNumber(){
+        check1.setAccountNumber("02468");
+
+        String expected = "02468";
+        String actual = check1.getRoutingNumber();
+        Assert.assertEquals(expected,actual);
+    }
+
+}

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

+package com.zipcoder.payment;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+public class CreditCardTest {
+
+    CreditCard card1;
+    CreditCard card2;
+
+    @Before
+    public void setup(){
+        card1 = new CreditCard(1L,"Jevit Tith","0000-1111-2222-3333", 3, 2020);
+        card2 = new CreditCard(2L,"Billy Boy", "4444-5555-6666-7777", 5, 2025);
+    }
+
+    @Test
+    public void testId(){
+        card1.setId(3L);
+
+        Long expected = 3L;
+        Long actual = card1.getId();
+
+        Assert.assertEquals(expected,actual);
+    }
+
+
+}