diff --git "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex1/AnimalSoundMain.java" "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex1/AnimalSoundMain.java"
new file mode 100644
index 0000000..c3181b1
--- /dev/null
+++ "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex1/AnimalSoundMain.java"
@@ -0,0 +1,25 @@
+package poly.ex1;
+
+public class AnimalSoundMain {
+    public static void main(String[] args) {
+        Dog dog = new Dog();
+        Cat cat = new Cat();
+        Caw caw = new Caw();
+
+        System.out.println("동물 소리 테스트 시작");
+        dog.sound();
+        System.out.println("동물 소리 테스트 종료");
+
+        System.out.println("동물 소리 테스트 시작");
+        cat.sound();
+        System.out.println("동물 소리 테스트 종료");
+
+        soundCaw(caw);
+    }
+
+    private static void soundCaw(Caw caw) {
+        System.out.println("동물 소리 테스트 시작");
+        caw.sound();
+        System.out.println("동물 소리 테스트 종료");
+    }
+}
diff --git "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex1/Cat.java" "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex1/Cat.java"
new file mode 100644
index 0000000..c49159c
--- /dev/null
+++ "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex1/Cat.java"
@@ -0,0 +1,7 @@
+package poly.ex1;
+
+public class Cat {
+    public void sound() {
+        System.out.println("냐옹");
+    }
+}
diff --git "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex1/Caw.java" "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex1/Caw.java"
new file mode 100644
index 0000000..39449c9
--- /dev/null
+++ "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex1/Caw.java"
@@ -0,0 +1,7 @@
+package poly.ex1;
+
+public class Caw {
+    public void sound() {
+        System.out.println("음메");
+    }
+}
diff --git "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex1/Dog.java" "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex1/Dog.java"
new file mode 100644
index 0000000..1aa233e
--- /dev/null
+++ "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex1/Dog.java"
@@ -0,0 +1,7 @@
+package poly.ex1;
+
+public class Dog {
+    public void sound() {
+        System.out.println("멍멍");
+    }
+}
diff --git "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/overriding/OverridingMain.java" "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/overriding/OverridingMain.java"
index f1117b2..bd5dce9 100644
--- "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/overriding/OverridingMain.java"
+++ "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/overriding/OverridingMain.java"
@@ -19,6 +19,6 @@ public static void main(String[] args) {
         System.out.println("Parent -> Child");
         System.out.println("value = " + poly.value);    // 변수는 오버라이딩 X
         poly.method();  // 메서드는 오버라이딩
-        // 오버라이딩 된 메서드는 항상 우선권을 가진다
+        // 오버라이딩 된 메서드는 항상 우선권을 가진딩
     }
 }