SE 2205a (Unit 1-Part 2)

Question 1

What is a generic class?

Answer 1

It can be created to generate a family of classes

Question 2

What is the key benefit of generics?

Answer 2

To enable errors to be detected at compile error rather than at runtime

Question 3

What do generic methods introduce?

Answer 3

They introduce their own type of parameters

Question 4

What is a bounded generic type?

Answer 4

A generic type that can be specified as a subtype of another type is a bounded one

Question 5

What is the first restriction on generics?

Answer 5

Cannot create an instance of a generic type (i.e. new T())

Question 6

What is the second restriction on generics?

Answer 6

Generic array creation is not allowed (i.e. new T[100])

Question 7

What is the third restriction on generics?

Answer 7

A generic type parameter of a class is not allowed in a static context

Question 8

What is the fourth restriction on generics?

Answer 8

Exception classes cannot be generic

Question 9

What is an ArrayList?

Answer 9

It is a generic class

Question 10

What does the ArrayList class allow?

Answer 10

Allows object storage, not primitive-type data storage

Question 11

How is the ArrayList different from an array?

Answer 11

-It automatically expands when a new item is added
-It automatically shrinks when items are removed

Question 12

What is the default capacity of an ArrayList?

Answer 12

10 items

Question 13

What are the three ways of printing items from an ArrayList?

Answer 13

-for loop
-enhanced for loop
-the toString()