Deck 14: Generics and the Arraylist Class

Question 1

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 1

C

Question 2

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

Answer 2

True

Question 3

Which is the correct syntax for placing the string "boat" into an ArrayList name recVehicles in position 3 for the first time?
(a)recVehicles.set(3,"boat");
(b)recVehicles.set("boat",3);
(c)recVehicles.add(3,"boat");
(d)recVehicles.add("boat",3);

Answer 3

C

Question 4

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 5

Class and method definitions that include parameters for types are called:
(a)generics
(b)ArrayList
(c)Base type
(d)None of the above

Question 6

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

Question 7

All of the following are methods of the ArrayList class except:
(a)length()
(b)size()
(c)set()
(d)get()

Question 8

A generic class can be instantiated as any of the following base types except:
(a)Character
(b)Array
(c)String
(d)Double

Question 9

All of the following are methods of the ArrayList class except:
(a)clear()
(b)resize()
(c)contains()
(d)trimToSize()

Question 10

All of the following are search methods of the ArrayList class except:
(a)isEmpty()
(b)lastIndexOf()
(c)indexOf()
(d)contains()

Question 11

The keyword ___________ can be used to place a bound on a type parameter.
(a)Implements
(b)Inherits
(c)Encapsulates
(d)Extends

Question 12

The remove(Object theElement)method of the ArrayList class returns:
(a)Int
(b)Double
(c)Byte
(d)Boolean

Question 13

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 14

All of the following are memory management methods of the ArrayList class except:
(a)ensureCapacity()
(b)clear()
(c)isEmpty()
(d)trimToSize()

Question 15

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

Question 16

To use the Java class ArrayList,you must import the package:
(a)java.awt
(b)java.io
(c)java.util
(d)java.container

Question 17

When using ArrayLists the method _______ can be used to save memory:
(a)trimToSize()
(b)trimDown()
(c)trimOff()
(d)None of the above

Question 18

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

Question 19

A/An ____________ can change the length while the program is running.
(a)Array
(b)ArrayList
(c)Type parameter
(d)None of the above

Question 20

An ArrayList object has a fixed size.

Question 21

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

Question 22

What is a parameterized class?

Question 23

The Type parameter is always indicated as a T.

Question 24

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

Question 25

What are the three main disadvantages of an ArrayList?

Question 26

A for loop is an enhanced loop.

Question 27

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

Question 28

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

Question 29

The compiler option -Xlint is good for debugging.

Question 30

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

Question 31

A class definition can have more than one type parameter.