diff --git a/pom.xml b/pom.xml
index 93036ba..0becdea 100644
--- a/pom.xml
+++ b/pom.xml
@@ -7,6 +7,32 @@
     <groupId>io.zipcoder</groupId>
     <artifactId>polymorphism</artifactId>
     <version>1.0-SNAPSHOT</version>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>6</source>
+                    <target>6</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
 
 
 </project>
\ No newline at end of file
diff --git a/src/main/java/io/zipcoder/pets/Cat.java b/src/main/java/io/zipcoder/pets/Cat.java
new file mode 100644
index 0000000..7b08676
--- /dev/null
+++ b/src/main/java/io/zipcoder/pets/Cat.java
@@ -0,0 +1,12 @@
+package io.zipcoder.pets;
+
+public class Cat extends Pet {
+    //private static final String name = "";
+    public Cat(String type, String name) {
+        super(type, name);
+    }
+
+    public String speak() {
+        return "Meow!";
+    }
+}
diff --git a/src/main/java/io/zipcoder/pets/Dog.java b/src/main/java/io/zipcoder/pets/Dog.java
new file mode 100644
index 0000000..987ee70
--- /dev/null
+++ b/src/main/java/io/zipcoder/pets/Dog.java
@@ -0,0 +1,14 @@
+package io.zipcoder.pets;
+
+public class Dog extends Pet {
+    // private static String name = "";
+
+    public Dog(String type, String name) {
+        super(type, name);
+    }
+
+    @Override
+    public String speak() {
+        return "Ruff Ruff";
+    }
+}
diff --git a/src/main/java/io/zipcoder/pets/Hampster.java b/src/main/java/io/zipcoder/pets/Hampster.java
new file mode 100644
index 0000000..2c3e6c7
--- /dev/null
+++ b/src/main/java/io/zipcoder/pets/Hampster.java
@@ -0,0 +1,13 @@
+package io.zipcoder.pets;
+
+public class Hampster extends Pet {
+
+    public Hampster(String type, String name) {
+        super(type, name);
+    }
+
+    @Override
+    public String speak() {
+        return "Squeak, Squeak.";
+    }
+}
diff --git a/src/main/java/io/zipcoder/pets/Pet.java b/src/main/java/io/zipcoder/pets/Pet.java
new file mode 100644
index 0000000..2ee0a0d
--- /dev/null
+++ b/src/main/java/io/zipcoder/pets/Pet.java
@@ -0,0 +1,36 @@
+package io.zipcoder.pets;
+
+import io.zipcoder.polymorphism.Animal;
+
+public abstract class Pet implements Animal {
+    private String name;
+    private String type;
+
+    protected Pet() {
+    }
+
+    public Pet(String type, String name) {
+        this.type = type;
+        this.name = name;
+    }
+
+    public String getType() {
+        return type;
+    }
+
+    public void setType(String type) {
+        this.type = type;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String speak() {
+        return "";
+    }
+}
diff --git a/src/main/java/io/zipcoder/polymorphism/Animal.java b/src/main/java/io/zipcoder/polymorphism/Animal.java
new file mode 100644
index 0000000..b9a1461
--- /dev/null
+++ b/src/main/java/io/zipcoder/polymorphism/Animal.java
@@ -0,0 +1,5 @@
+package io.zipcoder.polymorphism;
+
+public interface Animal {
+    String speak();
+}
diff --git a/src/main/java/io/zipcoder/polymorphism/MainApplication.java b/src/main/java/io/zipcoder/polymorphism/MainApplication.java
index ea9281e..2182aba 100644
--- a/src/main/java/io/zipcoder/polymorphism/MainApplication.java
+++ b/src/main/java/io/zipcoder/polymorphism/MainApplication.java
@@ -1,7 +1,44 @@
 package io.zipcoder.polymorphism;
 
+
+import com.sun.xml.internal.ws.api.model.wsdl.WSDLOutput;
+import io.zipcoder.pets.Cat;
+import io.zipcoder.pets.Dog;
+import io.zipcoder.pets.Hampster;
+import io.zipcoder.pets.Pet;
+import javax.crypto.spec.PSource;
+import javax.xml.namespace.QName;
+import java.util.ArrayList;
+import java.util.Scanner;
+
 /**
  * Created by leon on 11/6/17.
  */
 public class MainApplication {
+
+    public static void main(String[] args) {
+        String petType, petName;
+        ArrayList<Pet> petArrayList = new ArrayList<Pet>();
+        Scanner scanner = new Scanner(System.in);
+        System.out.println("How many pets do you have?");
+        int numberOfPets = scanner.nextInt();
+
+        for(int i = 1; i <= numberOfPets; i++) {
+            System.out.println("What kind of pet?");
+            petType = scanner.next();
+            System.out.println("Enter pet's name.");
+            petName = scanner.next();
+            if ("dog".equals(petType.toLowerCase())) {
+                petArrayList.add(new Dog(petType, petName));
+            } else if ("cat".equals(petType.toLowerCase())) {
+                petArrayList.add(new Cat(petType, petName));
+            } else if ("hampster".equals(petType.toLowerCase())) {
+                petArrayList.add(new Hampster(petType, petName));
+            }
+        }
+        for (Pet petObj : petArrayList) {
+            System.out.println(petObj.getName() + " " + petObj.speak());
+
+        }
+    }
 }
diff --git a/src/test/java/io/zipcoder/pets/CatTest.java b/src/test/java/io/zipcoder/pets/CatTest.java
new file mode 100644
index 0000000..01a9855
--- /dev/null
+++ b/src/test/java/io/zipcoder/pets/CatTest.java
@@ -0,0 +1,31 @@
+package io.zipcoder.pets;
+
+import io.zipcoder.polymorphism.Animal;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class CatTest extends Pet {
+
+    @Test
+    public void testGetName() {
+        Pet pet = new Cat("cat", "Sylvester");
+        String expected = "Sylvester";
+        String actual = pet.getName();
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testSpeak() {
+        Pet pet = new Cat("cat", "Socks");
+        String expected = "Meow!";
+        String actual = pet.speak();
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void inheritanceTest() {
+        Cat TestCat = new Cat("cat", "Fluffy");
+        Assert.assertTrue(TestCat instanceof Pet);
+        Assert.assertTrue(TestCat instanceof Cat);
+    }
+}
diff --git a/src/test/java/io/zipcoder/pets/DogTest.java b/src/test/java/io/zipcoder/pets/DogTest.java
new file mode 100644
index 0000000..a5bc6d5
--- /dev/null
+++ b/src/test/java/io/zipcoder/pets/DogTest.java
@@ -0,0 +1,30 @@
+package io.zipcoder.pets;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class DogTest extends Pet {
+
+    @Test
+    public void inheritanceTest() {
+        Dog TestDog = new Dog("dog", "Rex");
+        Assert.assertTrue(TestDog instanceof Pet);
+        Assert.assertTrue(TestDog instanceof Dog);
+    }
+
+    @Test
+    public void testGetName() {
+        Pet pet = new Dog("dog", "X");
+        String expected = "X";
+        String actual = pet.getName();
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testSpeak() {
+        Pet pet = new Dog("dog", "XX");
+        String expected = "Ruff Ruff";
+        String actual = pet.speak();
+        Assert.assertEquals(expected, actual);
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/io/zipcoder/pets/HampsterTest.java b/src/test/java/io/zipcoder/pets/HampsterTest.java
new file mode 100644
index 0000000..dd4521f
--- /dev/null
+++ b/src/test/java/io/zipcoder/pets/HampsterTest.java
@@ -0,0 +1,32 @@
+package io.zipcoder.pets;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class HampsterTest extends Pet {
+
+    @Test
+    public void testGetName() {
+        Pet pet = new Hampster("hampster", "Apple");
+        String expected = "Apple";
+        String actual = pet.getName();
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testSpeak() {
+        Pet pet = new Hampster("hampster", "Elvis");
+        String expected = "Squeak, Squeak.";
+        String actual = pet.speak();
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void inheritanceTest() {
+        Hampster TestHampster = new Hampster("hampster", "Earl");
+        Assert.assertTrue(TestHampster instanceof Pet);
+        Assert.assertTrue(TestHampster instanceof Hampster);
+
+    }
+}
+
diff --git a/src/test/java/io/zipcoder/polymorphism/MainApplicationTest.java b/src/test/java/io/zipcoder/polymorphism/MainApplicationTest.java
index 7181623..d414497 100644
--- a/src/test/java/io/zipcoder/polymorphism/MainApplicationTest.java
+++ b/src/test/java/io/zipcoder/polymorphism/MainApplicationTest.java
@@ -1,7 +1,37 @@
 package io.zipcoder.polymorphism;
 
+import io.zipcoder.pets.Cat;
+import io.zipcoder.pets.Dog;
+import io.zipcoder.pets.Hampster;
+import io.zipcoder.pets.Pet;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+
 /**
  * Created by leon on 11/6/17.
  */
 public class MainApplicationTest {
+    Pet testHamster = new Hampster("hampster", "Apple");
+    Pet testCat = new Cat("cat", "Sylvester");
+    Pet testDog = new Dog("dog", "XX");
+    ArrayList<Pet> petArrayList = new ArrayList<Pet>();
+
+    @Test
+    public void ArrayListTest() {
+        petArrayList.add(testDog);
+        Integer expected = 1;
+        Integer actual = petArrayList.size();
+        Assert.assertEquals(actual, expected);
+    }
+    @Test
+        public void ArrayListTest2() {
+        petArrayList.add(testCat);
+        petArrayList.add(testHamster);
+        Integer expected = 2;
+        Integer actual = petArrayList.size();
+        Assert.assertEquals (actual, expected);
+    }
 }