diff --git "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/AbstractAnimal.java" "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/AbstractAnimal.java"
new file mode 100644
index 0000000..bfaa559
--- /dev/null
+++ "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/AbstractAnimal.java"
@@ -0,0 +1,10 @@
+package poly.ex3;
+
+public abstract class AbstractAnimal {
+
+    public abstract void sound();
+
+    public void move() {
+        System.out.println("동물이 움직입니다.");
+    }
+}
diff --git "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/AbstractMain.java" "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/AbstractMain.java"
new file mode 100644
index 0000000..d0b2e1b
--- /dev/null
+++ "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/AbstractMain.java"
@@ -0,0 +1,28 @@
+package poly.ex3;
+
+public class AbstractMain {
+    public static void main(String[] args) {
+//        추상클래스 생성 불가
+//        AbstractAnimal animal = new AbstractAnimal();
+
+        Dog dog = new Dog();
+        Cat cat = new Cat();
+        Caw caw = new Caw();
+        Duck duck = new Duck();
+
+        cat.sound();
+        cat.move();
+
+        soundAnimal(dog);
+        soundAnimal(cat);
+        soundAnimal(caw);
+        soundAnimal(duck);
+    }
+
+    // 변하지 않는 부분
+    private static void soundAnimal(AbstractAnimal animal) {
+        System.out.println("동물 소리 테스트 시작");
+        animal.sound();
+        System.out.println("동물 소리 테스트 종료");
+    }
+}
diff --git "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/Cat.java" "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/Cat.java"
new file mode 100644
index 0000000..f14d518
--- /dev/null
+++ "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/Cat.java"
@@ -0,0 +1,8 @@
+package poly.ex3;
+
+public class Cat extends AbstractAnimal{
+    @Override
+    public void sound() {
+        System.out.println("냐옹");
+    }
+}
diff --git "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/Caw.java" "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/Caw.java"
new file mode 100644
index 0000000..840ad60
--- /dev/null
+++ "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/Caw.java"
@@ -0,0 +1,8 @@
+package poly.ex3;
+
+public class Caw extends AbstractAnimal{
+    @Override
+    public void sound() {
+        System.out.println("음메");
+    }
+}
diff --git "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/Dog.java" "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/Dog.java"
new file mode 100644
index 0000000..c1e968e
--- /dev/null
+++ "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/Dog.java"
@@ -0,0 +1,8 @@
+package poly.ex3;
+
+public class Dog extends AbstractAnimal {
+    @Override
+    public void sound() {
+        System.out.println("멍멍");
+    }
+}
diff --git "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/Duck.java" "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/Duck.java"
new file mode 100644
index 0000000..f6f252e
--- /dev/null
+++ "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/ex3/Duck.java"
@@ -0,0 +1,8 @@
+package poly.ex3;
+
+public class Duck extends AbstractAnimal {
+    @Override
+    public void sound() {
+        System.out.println("꽉꽉");
+    }
+}