diff --git "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/car0/CarMain0.java" "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/car0/CarMain0.java"
index 767c3d2..7c5fd53 100644
--- "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/car0/CarMain0.java"
+++ "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/car0/CarMain0.java"
@@ -7,5 +7,11 @@ public static void main(String[] args) {
 
         driver.setK3Car(k3Car);
         driver.drive();
+
+        // 추가
+        Model3Car model3Car = new Model3Car();
+        driver.setK3Car(null);
+        driver.setModel3Car(model3Car);
+        driver.drive();
     }
 }
diff --git "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/car0/Driver.java" "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/car0/Driver.java"
index e3719c4..ffc5cc0 100644
--- "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/car0/Driver.java"
+++ "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/car0/Driver.java"
@@ -3,15 +3,27 @@
 public class Driver {
 
     private K3Car k3Car;
+    private Model3Car model3Car;    // 추가
 
     public void setK3Car(K3Car k3Car) {
         this.k3Car = k3Car;
     }
 
+    // 추가
+    public void setModel3Car(Model3Car model3Car) {
+        this.model3Car = model3Car;
+    }
+
     public void drive() {
         System.out.println("자동차를 운전합니다.");
-        k3Car.startEngine();
-        k3Car.pressAccelerator();
-        k3Car.offEngine();
+        if (k3Car != null) {
+            k3Car.startEngine();
+            k3Car.pressAccelerator();
+            k3Car.offEngine();
+        } else if (model3Car != null) {
+            model3Car.startEngine();
+            model3Car.pressAccelerator();
+            model3Car.offEngine();
+        }
     }
 }
diff --git "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/car0/Model3Car.java" "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/car0/Model3Car.java"
new file mode 100644
index 0000000..e1826b6
--- /dev/null
+++ "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/car0/Model3Car.java"
@@ -0,0 +1,14 @@
+package poly.car0;
+
+public class Model3Car {
+    public void startEngine() {
+        System.out.println("Model3Car.startEngine");
+    }
+    public void offEngine() {
+        System.out.println("Model3Car.offEngine");
+    }
+
+    public void pressAccelerator() {
+        System.out.println("Model3Car.pressAccelerator");
+    }
+}