@@ -0,0 +1,152 @@
+class Square extends Shape %7B%0A%09private float length;%0A%0A%09Shape(float f = 10) %7B%0A%09%09this.length = f;%0A%09%7D%0A%0A%09public float area() %7B%0A%09%09return length * length;%0A%09%7D%0A%7D

Revert "Revert "add square""