Briefly answer the following questions: at is the primary difference between a Set and a Map? b) What happens when you add a primitive type (e.g, double) value to a collection? c) Can you print all...

Briefly answer the following questions: at is the primary difference between a Set and a Map? b) What happens when you add a primitive type (e.g, double) value to a collection? c) Can you print all the elements in a collection without using an Iterator? If yes, how?