Deck 14: Generics and the Arraylist Class

Question 1

The keyword ___________ can be used to place a bound on a type parameter.

A)Implements
B)Inherits
C)Encapsulates
D)Extends

Answer 1

D

Question 2

To place an element in an ArrayList position for the first time,you usually use the method:

A)put)
B)set)
C)add)
D)place)

Answer 2

C

Question 3

Inheritance is the reason why some parameters of the ArrayList class are of type Base_Type and others of type Object.

Answer 3

True

Question 4

An ArrayList object has a fixed size.

Question 5

The removeObject theElement)method of the ArrayList class returns:

A)Int
B)Double
C)Byte
D)Boolean

Question 6

A generic class can be instantiated as any of the following base types except:

A)Character
B)Array
C)String
D)Double

Question 7

The Java standard libraries have a class named ___________ that behaves almost exactly the same as the class ArrayList.

A)Array
B)Container
C)Vector
D)All of the above

Question 8

Which is the correct syntax for placing the string "boat" into an ArrayList name recVehicles in position 3 for the first time?

A)recVehicles.set3,"boat");
B)recVehicles.set"boat",3);
C)recVehicles.add3,"boat");
D)recVehicles.add"boat",3);

Question 9

All of the following are memory management methods of the ArrayList class except:

A)ensureCapacity)
B)clear)
C)isEmpty)
D)trimToSize)

Question 10

A class obtained from a generic class by plugging in a type for the type parameter is said to ________ the generic class.

A)Inherit
B)Encapsulate
C)Instantiate
D)None of the above

Question 11

All of the following are methods of the ArrayList class except:

A)clear)
B)resize)
C)contains)
D)trimToSize)

Question 12

You can not use the set method to put an element at just any index.

Question 13

All of the following are methods of the ArrayList class except:

A)length)
B)size)
C)set)
D)get)

Question 14

Class and method definitions that include parameters for types are called:

A)generics
B)ArrayList
C)Base type
D)None of the above

Question 15

A/An ____________ can change the length while the program is running.

A)Array
B)ArrayList
C)Type parameter
D)None of the above

Question 16

ArrayList objects do not have the array square-bracket notation.

Question 17

You can use any primitive type as the base type of an ArrayList class.

Question 18

When using ArrayLists the method _______ can be used to save memory:

A)trimToSize)
B)trimDown)
C)trimOff)
D)None of the above

Question 19

All of the following are search methods of the ArrayList class except:

A)isEmpty)
B)lastIndexOf)
C)indexOf)
D)contains)

Question 20

To use the Java class ArrayList,you must import the package:

A)java.awt
B)java.io
C)java.util
D)java.container

Question 21

What are the three main disadvantages of an ArrayList?

Question 22

You can plug in a primitive type for a type parameter.

Question 23

The Type parameter is always indicated as a T.

Question 24

A for loop is an enhanced loop.

Question 25

Write Java statements to display the size of the resulting ArrayList from question 5 above.

Question 26

What is a parameterized class?

Question 27

What is the base type of the ArrayList defined in question number 2?

Question 28

Write a Java statement to create an ArrayList to hold 25 integers.

Question 29

Rewrite the following line of code,but use type inference.
ArrayList< Integer > mylist = new ArrayList< Integer >);

Question 30

A class definition can have more than one type parameter.

Question 31

The definition of a parameterized class is a class with one or more type parameters.

Question 32

The compiler option -Xlint is good for debugging.