1 ( Sum the areas of geometric objects ) Write a method that sums the areas of all the geometric objects in an array. The method signature is: public static double sumArea(GeometricObject[] a) Write a...

1 (Sum the areas of geometric objects) Write a method that sums the areas of all the geometric objects in an array. The method signature is: public static double sumArea(GeometricObject[] a) Write a test program that creates an array of four objects (two circles and two rectangles) and computes their total area using the sumArea method.

2 (Revise Listing 13.11
) Rewrite the max class in Listing 13.11 to return null if the list is empty.