Question 1

To place an element in an ArrayList position for the first time,you usually use the method:&#10;(a)put()&#10;(b)set()&#10;(c)add()&#10;(d)place()

Accepted Answer

The method used to add an element at a specific position for the first time in an ArrayList is 'add()'. The 'put()' method is not a valid ArrayList method, 'set()' is used to change the value of an existing element at a specific position, and 'place()' is not a valid method for ArrayList.

Question 2

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

Accepted Answer

ArrayList objects use methods such as get() and set() to access and modify elements, instead of the array square-bracket notation.

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);

C

Accepted Answer

The correct syntax for placing a string at a specific position in an ArrayList for the first time is to use the add() method with two arguments - the index (position) where the string should be placed and the string itself. Therefore, choice C, recVehicles.add(3,"boat"), is the correct syntax for placing the string "boat" into an ArrayList named recVehicles in position 3 for the first time. The other choices are incorrect - A uses the set() method which will replace an existing element at the specified index, B has the incorrect argument order, and D attempts to add a string to the ArrayList using an index position, which is not possible.

Question 4

A class obtained from a generic class by plugging in a type for the type parameter is said to ________ the generic class.&#10;(a)Inherit&#10;(b)Encapsulate&#10;(c)Instantiate&#10;(d)None of the above

Accepted Answer

When we plug in a type for the type parameter of a generic class, we create an instance of that class with the specified type. This process is known as instantiation. Therefore, the correct answer is C - Instantiate. Inheriting is a concept related to class hierarchy, while encapsulation refers to the hiding of implementation details in a class. Neither of these concepts is directly related to the idea of creating a new class from a generic one through type parameters.

Question 5

Class and method definitions that include parameters for types are called:&#10;(a)generics&#10;(b)ArrayList&#10;(c)Base type&#10;(d)None of the above

Accepted Answer

When a class or method is defined with parameters for types, it is called a generic class or method. The type that is passed as a parameter can be used within the class or method to create variables, return values, or perform other operations. Therefore, choice A is the correct answer. Choices B and C are incorrect as they do not accurately describe the definition given in the question. Choice D is also incorrect as a defined class or method always has a specific purpose and cannot be without a definition.

Question 6

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

Accepted Answer

ArrayList in Java can only hold objects, and primitive types (like int, float, char) need to be used in their wrapper class form (like Integer, Float, Character) to be stored in an ArrayList.

Question 7

All of the following are methods of the ArrayList class except:&#10;(a)length()&#10;(b)size()&#10;(c)set()&#10;(d)get()

Accepted Answer

The ArrayList class does not have a method called length(). The correct method to get the number of elements in an ArrayList is size(). The other two options, set() and get(), are used to set and retrieve elements at specific indices in the ArrayList.

Question 8

A generic class can be instantiated as any of the following base types except:&#10;(a)Character&#10;(b)Array&#10;(c)String&#10;(d)Double

Accepted Answer

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

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Question 9

All of the following are methods of the ArrayList class except:&#10;(a)clear()&#10;(b)resize()&#10;(c)contains()&#10;(d)trimToSize()

Accepted Answer

The ArrayList class does not have a method named resize(). The other three methods, clear(), contains(), and trimToSize(), are all methods of the ArrayList class.

Question 10

All of the following are search methods of the ArrayList class except:&#10;(a)isEmpty()&#10;(b)lastIndexOf()&#10;(c)indexOf()&#10;(d)contains()

Accepted Answer

The method isEmpty() is not a search method of the ArrayList class, it is a method to check if the ArrayList is empty. The other methods listed are all search methods of the ArrayList class.

Question 11

The keyword ___________ can be used to place a bound on a type parameter.&#10;(a)Implements&#10;(b)Inherits&#10;(c)Encapsulates&#10;(d)Extends

Accepted Answer

The answer of The keyword ___________ can be used to...

Question 12

The remove(Object theElement)method of the ArrayList class returns:&#10;(a)Int&#10;(b)Double&#10;(c)Byte&#10;(d)Boolean

Accepted Answer

The answer of The remove(Object theElement)method of the ArrayList class...

Question 13

The Java standard libraries have a class named ___________ that behaves almost exactly the same as the class ArrayList.&#10;(a)Array&#10;(b)Container&#10;(c)Vector&#10;(d)All of the above

Accepted Answer

The answer of The Java standard libraries have a class...

Question 14

All of the following are memory management methods of the ArrayList class except:&#10;(a)ensureCapacity()&#10;(b)clear()&#10;(c)isEmpty()&#10;(d)trimToSize()

Accepted Answer

The answer of All of the following are memory management...

Question 15

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

Accepted Answer

The answer of Inheritance is the reason why some parameters...

Question 16

To use the Java class ArrayList,you must import the package:&#10;(a)java.awt&#10;(b)java.io&#10;(c)java.util&#10;(d)java.container

Accepted Answer

The answer of To use the Java class ArrayList,you must...

Question 17

When using ArrayLists the method _______ can be used to save memory:&#10;(a)trimToSize()&#10;(b)trimDown()&#10;(c)trimOff()&#10;(d)None of the above

Accepted Answer

The answer of When using ArrayLists the method _______ can...

Question 18

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

Accepted Answer

The answer of You can not use the set method...

Question 19

A/An ____________ can change the length while the program is running.&#10;(a)Array&#10;(b)ArrayList&#10;(c)Type parameter&#10;(d)None of the above

Accepted Answer

The answer of A/An ____________ can change the length while...

Question 20

An ArrayList object has a fixed size.

Accepted Answer

The answer of An ArrayList object has a fixed size....

Question 21

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

Accepted Answer

The answer of What is the base type of the...

Question 22

What is a parameterized class?

Accepted Answer

The answer of What is a parameterized class?...

Question 23

The Type parameter is always indicated as a T.

Accepted Answer

The answer of The Type parameter is always indicated as...

Question 24

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

Accepted Answer

The answer of Write Java statements to display the size...

Question 25

What are the three main disadvantages of an ArrayList?

Accepted Answer

The answer of What are the three main disadvantages of...

Question 26

A for loop is an enhanced loop.

Accepted Answer

The answer of A for loop is an enhanced loop....

Question 27

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

Accepted Answer

The answer of The definition of a parameterized class is...

Question 28

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

Accepted Answer

The answer of Write a Java statement to create an...

Question 29

The compiler option -Xlint is good for debugging.

Accepted Answer

The answer of The compiler option -Xlint is good for...

Question 30

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

Accepted Answer

The answer of You can plug in a primitive type...

Question 31

A class definition can have more than one type parameter.

Accepted Answer

The answer of A class definition can have more than...

Deck 14: Generics and the Arraylist Class