diff --git a/lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/shawndunsmore/BuyType.java b/lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/shawndunsmore/BuyType.java
new file mode 100644
index 000000000..f29599cd1
--- /dev/null
+++ b/lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/shawndunsmore/BuyType.java
@@ -0,0 +1,7 @@
+package com.codedifferently.lesson16.shawndunsmore;
+
+public enum BuyType {
+  BONUS_BUY,
+  DOUBLE_CHANCE,
+  NORMAL_BUY,
+}
diff --git a/lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/shawndunsmore/InvalidPayAmountException.java b/lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/shawndunsmore/InvalidPayAmountException.java
new file mode 100644
index 000000000..df082503a
--- /dev/null
+++ b/lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/shawndunsmore/InvalidPayAmountException.java
@@ -0,0 +1,8 @@
+package com.codedifferently.lesson16.shawndunsmore;
+
+public class InvalidPayAmountException extends Exception {
+
+  public InvalidPayAmountException(String message) {
+    super(message);
+  }
+}
diff --git a/lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/shawndunsmore/SlotMachine.java b/lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/shawndunsmore/SlotMachine.java
new file mode 100644
index 000000000..1dbc998bd
--- /dev/null
+++ b/lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/shawndunsmore/SlotMachine.java
@@ -0,0 +1,106 @@
+package com.codedifferently.lesson16.shawndunsmore;
+
+import java.util.ArrayList;
+import java.util.Collections;
+
+public class SlotMachine {
+  private int numOfSlots;
+  private int payAmount;
+  private String name;
+  private BuyType buyType;
+  private ArrayList<String> iconList;
+  private int moneyNeeded;
+
+  public SlotMachine(
+      int numOfSlots,
+      int payAmount,
+      String name,
+      BuyType buyType,
+      ArrayList<String> iconList,
+      int moneyNeeded) {
+    this.numOfSlots = numOfSlots;
+    this.payAmount = payAmount;
+    this.name = name;
+    this.buyType = buyType;
+    this.iconList = iconList;
+    this.moneyNeeded = moneyNeeded;
+  }
+
+  public int getNumOfSlots() {
+    return numOfSlots;
+  }
+
+  public int getPayAmount() {
+    return payAmount;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public BuyType getBuyType() {
+    return buyType;
+  }
+
+  public ArrayList<String> getIconList() {
+    return iconList;
+  }
+
+  public int payOut() {
+    if (buyType.equals(BuyType.DOUBLE_CHANCE)) {
+      return payAmount * 2;
+    }
+
+    if (buyType.equals(BuyType.BONUS_BUY)) {
+      return payAmount * 3;
+    }
+    return payAmount;
+  }
+
+  public ArrayList<String> spin(int money) throws InvalidPayAmountException {
+    if (money < moneyNeeded) {
+      throw new InvalidPayAmountException("Amount inavalid");
+    }
+    Collections.shuffle(iconList);
+    return iconList;
+  }
+
+  public ArrayList<String> spin(int money, int numOfSpins) throws InvalidPayAmountException {
+    if (money < moneyNeeded) {
+      throw new InvalidPayAmountException("Amount inavalid");
+    }
+    for (int i = 0; i < numOfSpins; i++) {
+      Collections.shuffle(iconList);
+    }
+
+    return iconList;
+  }
+
+  public int getMoneyNeeded() {
+    return moneyNeeded;
+  }
+
+  public void setNumOfSlots(int numOfSlots) {
+    this.numOfSlots = numOfSlots;
+  }
+
+  public void setPayAmount(int payAmount) {
+    this.payAmount = payAmount;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public void setBuyType(BuyType buyType) {
+    this.buyType = buyType;
+  }
+
+  public void setIconList(ArrayList<String> iconList) {
+    this.iconList = iconList;
+  }
+
+  public void setMoneyNeeded(int moneyNeeded) {
+    this.moneyNeeded = moneyNeeded;
+  }
+}
diff --git a/lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/ShawnDunsmore/SlotMachineTest.java b/lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/ShawnDunsmore/SlotMachineTest.java
new file mode 100644
index 000000000..be5cc64b5
--- /dev/null
+++ b/lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/ShawnDunsmore/SlotMachineTest.java
@@ -0,0 +1,174 @@
+package com.codedifferently.lesson16.shawndunsmore;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import org.junit.jupiter.api.Test;
+
+public class SlotMachineTest {
+  @Test
+  public void testMoney_Exists() {
+    SlotMachine slot = new SlotMachine(0, 0, null, null, null, 10);
+    assertEquals(10, slot.getMoneyNeeded());
+  }
+
+  @Test
+  public void testNumOfSlots_Exists() {
+    SlotMachine slot = new SlotMachine(1, 0, null, null, null, 10);
+    assertEquals(1, slot.getNumOfSlots());
+  }
+
+  @Test
+  public void testNameOfSlot_Exists() {
+    SlotMachine slot = new SlotMachine(1, 0, "Goldie", null, null, 10);
+    assertEquals("Goldie", slot.getName());
+  }
+
+  @Test
+  public void testPayAmount_Exists() {
+    SlotMachine slot = new SlotMachine(1, 10, "Goldie", null, null, 10);
+    assertEquals(10, slot.getPayAmount());
+  }
+
+  @Test
+  public void testBuyType_Exists() {
+    SlotMachine slot = new SlotMachine(1, 10, "Goldie", null, null, 10);
+    assertEquals(null, slot.getBuyType());
+  }
+
+  @Test
+  public void testUseDoubleSlots() {
+    SlotMachine slottwo = new SlotMachine(1, 10, "Goldie", null, null, 10);
+    SlotMachine slotone = new SlotMachine(1, 10, "Diamond", null, null, 10);
+    assertEquals(1, slotone.getNumOfSlots());
+    assertEquals(1, slottwo.getNumOfSlots());
+  }
+
+  @Test
+  public void testSlotSpin() {
+    SlotMachine slot = new SlotMachine(1, 10, "Goldie", null, null, 10);
+    assertEquals(null, slot.getIconList());
+  }
+
+  @Test
+  public void testPayOut() {
+
+    ArrayList<String> icons = new ArrayList<>();
+    SlotMachine slotMachine1 =
+        new SlotMachine(1, 10, "Test Slot 1", BuyType.DOUBLE_CHANCE, icons, 10);
+    assertEquals(20, slotMachine1.payOut(), "Expected payout for DOUBLE_CHANCE to be 20");
+
+    SlotMachine slotMachine2 = new SlotMachine(1, 10, "Test Slot 2", BuyType.BONUS_BUY, icons, 10);
+    assertEquals(30, slotMachine2.payOut(), "Expected payout for BONUS_BUY to be 30");
+  }
+
+  @Test
+  public void testSetNumOfSlots() {
+    SlotMachine slotMachine =
+        new SlotMachine(3, 10, "Test Slot", BuyType.NORMAL_BUY, new ArrayList<>(), 10);
+
+    slotMachine.setNumOfSlots(5);
+
+    assertEquals(5, slotMachine.getNumOfSlots(), "The number of slots should be updated to 5");
+  }
+
+  @Test
+  public void testSetPayAmount() {
+    SlotMachine slotMachine =
+        new SlotMachine(3, 10, "Test Slot", BuyType.NORMAL_BUY, new ArrayList<>(), 10);
+
+    slotMachine.setPayAmount(20);
+
+    assertEquals(20, slotMachine.getPayAmount(), "The pay amount should be updated to 20");
+  }
+
+  @Test
+  public void testSetName() {
+    SlotMachine slotMachine =
+        new SlotMachine(3, 10, "Test Slot", BuyType.NORMAL_BUY, new ArrayList<>(), 10);
+
+    slotMachine.setName("Lucky Slot");
+
+    assertEquals("Lucky Slot", slotMachine.getName(), "The name should be updated to 'Lucky Slot'");
+  }
+
+  @Test
+  public void testSetBuyType() {
+    SlotMachine slotMachine =
+        new SlotMachine(3, 10, "Test Slot", BuyType.NORMAL_BUY, new ArrayList<>(), 10);
+
+    slotMachine.setBuyType(BuyType.BONUS_BUY);
+
+    assertEquals(
+        BuyType.BONUS_BUY, slotMachine.getBuyType(), "The buy type should be updated to BONUS_BUY");
+  }
+
+  @Test
+  public void testSetIconList() {
+    SlotMachine slotMachine =
+        new SlotMachine(3, 10, "Test Slot", BuyType.NORMAL_BUY, new ArrayList<>(), 10);
+
+    ArrayList<String> newIcons = new ArrayList<>();
+    newIcons.add("🍒");
+    newIcons.add("🍋");
+    newIcons.add("🍊");
+
+    slotMachine.setIconList(newIcons);
+
+    assertEquals(
+        newIcons, slotMachine.getIconList(), "The icon list should be updated with the new icons");
+  }
+
+  @Test
+  public void testSetMoneyNeeded() {
+    SlotMachine slotMachine =
+        new SlotMachine(3, 10, "Test Slot", BuyType.NORMAL_BUY, new ArrayList<>(), 10);
+
+    slotMachine.setMoneyNeeded(15);
+
+    assertEquals(15, slotMachine.getMoneyNeeded(), "The money needed should be updated to 15");
+  }
+
+  @Test
+  public void testSpinThrowsExceptionWhenMoneyIsInsufficient() {
+    ArrayList<String> icons = new ArrayList<>();
+    icons.add("🍒");
+    icons.add("🍋");
+    icons.add("🍊");
+
+    SlotMachine slotMachine = new SlotMachine(3, 10, "Test Slot", BuyType.NORMAL_BUY, icons, 10);
+
+    Exception exception =
+        assertThrows(
+            InvalidPayAmountException.class,
+            () -> {
+              slotMachine.spin(5);
+            });
+
+    assertEquals("Amount inavalid", exception.getMessage());
+  }
+
+  @Test
+  public void testSpinShufflesIconList() throws InvalidPayAmountException {
+    ArrayList<String> icons = new ArrayList<>();
+    icons.add("🍒");
+    icons.add("🍋");
+    icons.add("🍊");
+
+    SlotMachine slotMachine = new SlotMachine(3, 10, "Test Slot", BuyType.NORMAL_BUY, icons, 10);
+
+    ArrayList<String> originalIcons = new ArrayList<>(slotMachine.getIconList());
+
+    slotMachine.spin(10);
+
+    ArrayList<String> shuffledIcons = slotMachine.getIconList();
+
+    Collections.sort(originalIcons);
+    Collections.sort(shuffledIcons);
+
+    assertEquals(
+        originalIcons, shuffledIcons, "The icon list should have the same contents after spinning");
+  }
+}