[CHORE] chapter 6-2 정답

chapter6/euna/chapter6-2.java

@@ -19,12 +19,18 @@ public class Geometry {
     public double area(Object shape) throws NoSuchShapeException {
         if (shape instanceof Square) {
             /* 구현하세요 */
+            Square square = (Square)shape;
+            return square.side * square.topLeft;
         }
         else if (shape instanceof Rectangle) {
             /* 구현하세요 */
+            Rectangle rectagle = (Rectangle)shape;
+            return rectagle.height * rectagle.width;
         }
         else if (shape instanceof Circle) {
             /* 구현하세요 */
+            Circle cirle = (Circle)circle;
+            return circle.radius*circle.radius*PI;
         }
         throw new NoSuchShapeException();
     }