diff --git a/chapter6/haesa/refactor-chapter6-3.java b/chapter6/haesa/refactor-chapter6-3.java
new file mode 100644
index 0000000..a148ec0
--- /dev/null
+++ b/chapter6/haesa/refactor-chapter6-3.java
@@ -0,0 +1,34 @@
+// (1)과 (2) 빈칸에 들어갈 용어를 작성하세요
+
+public interface Shape {
+    public double area();
+}
+
+public class Square implements Shape {
+    private Point topLeft;
+    private double side;
+
+    public double area() {
+        return side * side;
+    }
+}
+
+public class Rectangle implements Shape {
+    private Point topLeft;
+    private double height;
+    private double width;
+
+    public double area() {
+        return height * width;
+    }
+}
+
+public class Circle implements Shape {
+    public final double PI = 3.141592653;
+    private Point center;
+    private double radius;
+
+    public double area() {
+        return PI * radius * radius;
+    }
+}
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