diff --git "a/\354\236\204\354\244\200\355\230\225/java-basic/src/main/java/week3/poly/ex2/Animal.java" "b/\354\236\204\354\244\200\355\230\225/java-basic/src/main/java/week3/poly/ex2/Animal.java"
new file mode 100644
index 0000000..fa59b4a
--- /dev/null
+++ "b/\354\236\204\354\244\200\355\230\225/java-basic/src/main/java/week3/poly/ex2/Animal.java"
@@ -0,0 +1,7 @@
+package week3.poly.ex2;
+
+public class Animal {
+    public void sound() {
+        System.out.println("동물 울음 소리");
+    }
+}
diff --git "a/\354\236\204\354\244\200\355\230\225/java-basic/src/main/java/week3/poly/ex2/AnimalSoundMain1.java" "b/\354\236\204\354\244\200\355\230\225/java-basic/src/main/java/week3/poly/ex2/AnimalSoundMain1.java"
new file mode 100644
index 0000000..fce9ac5
--- /dev/null
+++ "b/\354\236\204\354\244\200\355\230\225/java-basic/src/main/java/week3/poly/ex2/AnimalSoundMain1.java"
@@ -0,0 +1,35 @@
+package week3.poly.ex2;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class AnimalSoundMain1 {
+    public static void main(String[] args) {
+        Dog dog = new Dog();
+        Cat cat = new Cat();
+        Caw caw = new Caw();
+
+        soundAnimal(dog);
+        soundAnimal(cat);
+        soundAnimal(caw);
+
+        // 혼자해본 연습
+        /*
+        Animal dog1 = new Dog();
+        Animal cat1 = new Cat();
+        Animal caw1 = new Caw();
+        List<Animal> animals = new ArrayList<>();
+        animals.add(dog1);
+        animals.add(cat1);
+        animals.add(caw1);
+
+        animals.forEach(animal -> soundAnimal(animal));
+         */
+    }
+
+    private static void soundAnimal(Animal animal) {
+        System.out.println("동물 소리 테스트 시작");
+        animal.sound();
+        System.out.println("동물 소리 테스트 종료");
+    }
+}
diff --git "a/\354\236\204\354\244\200\355\230\225/java-basic/src/main/java/week3/poly/ex2/Cat.java" "b/\354\236\204\354\244\200\355\230\225/java-basic/src/main/java/week3/poly/ex2/Cat.java"
new file mode 100644
index 0000000..da2235c
--- /dev/null
+++ "b/\354\236\204\354\244\200\355\230\225/java-basic/src/main/java/week3/poly/ex2/Cat.java"
@@ -0,0 +1,9 @@
+package week3.poly.ex2;
+
+public class Cat extends Animal {
+
+    @Override
+    public void sound() {
+        System.out.println("야옹");
+    }
+}
diff --git "a/\354\236\204\354\244\200\355\230\225/java-basic/src/main/java/week3/poly/ex2/Caw.java" "b/\354\236\204\354\244\200\355\230\225/java-basic/src/main/java/week3/poly/ex2/Caw.java"
new file mode 100644
index 0000000..a7e2b6d
--- /dev/null
+++ "b/\354\236\204\354\244\200\355\230\225/java-basic/src/main/java/week3/poly/ex2/Caw.java"
@@ -0,0 +1,8 @@
+package week3.poly.ex2;
+
+public class Caw extends Animal{
+    @Override
+    public void sound() {
+        System.out.println("음메");
+    }
+}
diff --git "a/\354\236\204\354\244\200\355\230\225/java-basic/src/main/java/week3/poly/ex2/Dog.java" "b/\354\236\204\354\244\200\355\230\225/java-basic/src/main/java/week3/poly/ex2/Dog.java"
new file mode 100644
index 0000000..71adaaa
--- /dev/null
+++ "b/\354\236\204\354\244\200\355\230\225/java-basic/src/main/java/week3/poly/ex2/Dog.java"
@@ -0,0 +1,8 @@
+package week3.poly.ex2;
+
+public class Dog extends Animal{
+    @Override
+    public void sound() {
+        System.out.println("멍멍");
+    }
+}