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..4173054
--- /dev/null
+++ b/src/main/java/io/zipcoder/polymorphism/Animal.java
@@ -0,0 +1,7 @@
+package io.zipcoder.polymorphism;
+
+public interface Animal {
+
+    String speak();
+
+}
diff --git a/src/main/java/io/zipcoder/polymorphism/Bear.java b/src/main/java/io/zipcoder/polymorphism/Bear.java
new file mode 100644
index 0000000..07c3b7f
--- /dev/null
+++ b/src/main/java/io/zipcoder/polymorphism/Bear.java
@@ -0,0 +1,22 @@
+package io.zipcoder.polymorphism;
+
+public class Bear extends Pet implements Animal {
+
+
+    public Bear(String name) {
+        super(name);
+    }
+
+    public String getName() {
+        return this.name;
+    }
+
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String speak() {
+        return "Roar!";
+    }
+}
diff --git a/src/main/java/io/zipcoder/polymorphism/Cat.java b/src/main/java/io/zipcoder/polymorphism/Cat.java
new file mode 100644
index 0000000..6443b69
--- /dev/null
+++ b/src/main/java/io/zipcoder/polymorphism/Cat.java
@@ -0,0 +1,20 @@
+package io.zipcoder.polymorphism;
+
+public class Cat extends Pet implements Animal {
+
+    public Cat(String name) {
+        super(name);
+    }
+
+    public String getName() {
+        return this.name;
+    }
+
+    public String speak() {
+        return "Meow!";
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}
diff --git a/src/main/java/io/zipcoder/polymorphism/Dog.java b/src/main/java/io/zipcoder/polymorphism/Dog.java
new file mode 100644
index 0000000..b5d00f7
--- /dev/null
+++ b/src/main/java/io/zipcoder/polymorphism/Dog.java
@@ -0,0 +1,21 @@
+package io.zipcoder.polymorphism;
+
+public class Dog extends Pet implements Animal{
+
+
+    public Dog(String name) {
+        super(name);
+    }
+
+    public String getName() {
+        return this.name;
+    }
+
+    public String speak() {
+        return "Woof!";
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}
diff --git a/src/main/java/io/zipcoder/polymorphism/MainApplication.java b/src/main/java/io/zipcoder/polymorphism/MainApplication.java
index 668c627..6a78b51 100644
--- a/src/main/java/io/zipcoder/polymorphism/MainApplication.java
+++ b/src/main/java/io/zipcoder/polymorphism/MainApplication.java
@@ -1,4 +1,5 @@
 package io.zipcoder.polymorphism;
 
 public class MainApplication {
+
 }
diff --git a/src/main/java/io/zipcoder/polymorphism/Pet.java b/src/main/java/io/zipcoder/polymorphism/Pet.java
new file mode 100644
index 0000000..bef172c
--- /dev/null
+++ b/src/main/java/io/zipcoder/polymorphism/Pet.java
@@ -0,0 +1,9 @@
+package io.zipcoder.polymorphism;
+
+public abstract class Pet implements Animal{
+    String name;
+
+    public Pet(String name) {
+        this.name = name;
+    }
+}
diff --git a/src/test/java/io/zipcoder/polymorphism/TestBear.java b/src/test/java/io/zipcoder/polymorphism/TestBear.java
new file mode 100644
index 0000000..9912edc
--- /dev/null
+++ b/src/test/java/io/zipcoder/polymorphism/TestBear.java
@@ -0,0 +1,60 @@
+package io.zipcoder.polymorphism;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestBear {
+    @Test
+    public void bearConstructorTest() {
+        //Given
+        String given = "Bubbles";
+        //When
+        Bear bear = new Bear(given);
+        String expected = bear.getName();
+        //Then
+        Assert.assertEquals(given, expected);
+    }
+
+    @Test
+    public void speakTest() {
+        //Given
+        Bear bear = new Bear("Bubbles");
+        String given = "Roar!";
+        //When
+        String expected = bear.speak();
+        //Then
+        Assert.assertEquals(given, expected);
+    }
+
+    @Test
+    public void setNameTest() {
+        //Given
+        Bear bear = new Bear("");
+        String given = "Bubbles";
+
+        //When
+        bear.setName(given);
+
+        //Then
+        String expected = bear.getName();
+        Assert.assertEquals(given, expected);
+    }
+
+    @Test
+    public void inheritanceOfPetTest() {
+
+        Bear bear = new Bear("Bubbles");
+        Assert.assertTrue(bear instanceof Pet);
+
+    }
+
+    @Test
+    public void inheritanceOfAnimalTest() {
+
+        Bear bear = new Bear("Bubbles");
+        Assert.assertTrue(bear instanceof Animal);
+
+    }
+
+}
+
diff --git a/src/test/java/io/zipcoder/polymorphism/TestCat.java b/src/test/java/io/zipcoder/polymorphism/TestCat.java
new file mode 100644
index 0000000..67aeb7a
--- /dev/null
+++ b/src/test/java/io/zipcoder/polymorphism/TestCat.java
@@ -0,0 +1,58 @@
+package io.zipcoder.polymorphism;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestCat {
+        @Test
+        public void catConstructorTest(){
+            //Given
+            String given = "Ellie";
+            //When
+            Cat cat = new Cat(given);
+            String expected = cat.getName();
+            //Then
+            Assert.assertEquals(given, expected);
+        }
+
+        @Test
+        public void speakTest(){
+            //given
+            Cat cat = new Cat("Ellie");
+            String given = "Meow!";
+            //when
+            String expected = cat.speak();
+            //then
+            Assert.assertEquals(given, expected);
+        }
+
+        @Test
+        public void setNameTest() {
+            //Given
+            Cat cat = new Cat("");
+            String given = "Ellie";
+
+            //When
+            cat.setName(given);
+
+            //Then
+            String expected = cat.getName();
+            Assert.assertEquals(given, expected);
+        }
+
+        @Test
+        public void inheritanceOfPetTest(){
+
+            Cat cat = new Cat("Ellie");
+            Assert.assertTrue(cat instanceof Pet);
+
+        }
+
+        @Test
+        public void inheritanceOfAnimalTest(){
+
+            Cat cat = new Cat("Ellie");
+            Assert.assertTrue(cat instanceof Animal);
+
+        }
+    }
diff --git a/src/test/java/io/zipcoder/polymorphism/TestDog.java b/src/test/java/io/zipcoder/polymorphism/TestDog.java
new file mode 100644
index 0000000..35d0415
--- /dev/null
+++ b/src/test/java/io/zipcoder/polymorphism/TestDog.java
@@ -0,0 +1,59 @@
+package io.zipcoder.polymorphism;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestDog {
+    @Test
+    public void dogConstructorTest() {
+        //Given
+        String given = "Spot";
+        //When
+        Dog dog = new Dog(given);
+        String expected = dog.getName();
+        //Then
+        Assert.assertEquals(given, expected);
+    }
+
+    @Test
+    public void speakTest() {
+        //Given
+        Dog dog = new Dog("Spot");
+        String given = "Woof!";
+        //When
+        String expected = dog.speak();
+        //Then
+        Assert.assertEquals(given, expected);
+    }
+
+    @Test
+    public void setNameTest() {
+        // Given
+        Dog dog = new Dog("");
+        String given = "Spot";
+
+        // When
+        dog.setName(given);
+
+        // Then
+        String expected = dog.getName();
+        Assert.assertEquals(given, expected);
+    }
+
+    @Test
+    public void inheritanceOfPetTest() {
+
+        Dog dog = new Dog("Spot");
+        Assert.assertTrue(dog instanceof Pet);
+
+    }
+
+    @Test
+    public void inheritanceOfAnimalTest() {
+
+        Dog dog = new Dog("Spot");
+        Assert.assertTrue(dog instanceof Animal);
+
+    }
+}
+