Java QUESTION 1 Typically, _________________. Recursion uses selection and itera

Question

Java

QUESTION 1

Typically, _________________.

Recursion uses selection and iteration uses looping

Recursion uses looping and iteration uses selection

5 points   

QUESTION 2

To access the element at row i and column j of a two-dimensional array named grades, we use _________________.

grades[ j ][ i ]

grades

grades( j )( i )

grades[ i ][ j ]

grades( i )( j )

5 points   

QUESTION 3

What method is used to set the width and height of a window?

setSize

setWindow

setWidthHeight

setHeightWidth

5 points   

QUESTION 4

Assuming the class B inherits from class A and method foo belongs to class A, what do we mean by overriding method foo in class B?

We are calling method foo in class B

We are coding another version of method foo in class B

We are not using method foo in class B

5 points   

QUESTION 5

Binary search applies to ________________.

Either an unsorted or a sorted array

An unsorted array

A sorted array

5 points   

QUESTION 6

If you want to make a component opaque or transparent, what method do you use?

SetTransparent

opaque

transparent

setOpaque

5 points   

QUESTION 7

What Java keyword do we use in the constructor of a class inheriting from another class if we want to call the constructor of the inherited class?

clone

super

constructor

call

5 points   

QUESTION 8

What is the function of a GUI component?

Display information only

Enable user interaction only

All of the above

5 points   

QUESTION 9

Constructors

Are accessible but are not inherited

Are inherited and can be accessed

Are not inherited and cannot be accessed

Are inherited but cannot be accessed

5 points   

QUESTION 10

When class B inherits from class A?

A is the subclass and B is the superclass

A is the superclass and B is the subclass

5 points   

QUESTION 11

To access the number of rows in a two-dimensional array named grades, we use _________________.

rades.length

grades.size

grades.length( )

grades.size( )

grades

5 points   

QUESTION 12

In order to handle an exception, we use a _________________ construct.

try and finally

try and catch

catch and finally

5 points   

QUESTION 13

Which package does the JFrame class belong to?

java.awt

java.swing

javax.awt

javax,swing

5 points   

QUESTION 14

If you want to disable a component, what method do you use?

SetDisabled

setEnabled

Disabled

Enabled

5 points   

QUESTION 15

To access the number of columns in row i of a two-dimensional array named grades, we use _________________.

grades.length

grades[ i ].length

grades{ i }.length

grades( i ).length

grades( i ).size

5 points   

QUESTION 16

Assuming the class B inherits from class A, then

An object of class A is an object of class B

An object of class B is an object of class A

All of the above

None of the above

5 points   

QUESTION 17

What keyword do we use in the class header that inherits from another class?

inherits

extends

modifies

protected

5 points   

QUESTION 18

A linked list ________________.

Has fixed size

Can grow but not shrink, i.e., items can be added but not deleted

Can shrink but not grow, i.e., items can be deleted but not added

Can grow and shrink as items are added or deleted

5 points   

QUESTION 19

The header of a method that potentially generates an exception when called contains the keyword _______________ .

excepts

throws

generates

5 points   

QUESTION 20

When creating a GUI application class, which class do we typically extend?

JFrame

Container

Window

Component

Recursion uses selection and iteration uses looping

Recursion uses looping and iteration uses selection

Explanation / Answer

1) Typically, Recursion uses selection and iteration uses looping.
2) To access the element at row i and column j of a two-dimensional array named grades, we use grades[ i ][ j ]
3) What method is used to set the width and height of a window? setSize
4) Assuming the class B inherits from class A and method foo belongs to class A, what do we mean by overriding method foo in class B?
We are coding another version of method foo in class B
5) Binary search applies to A sorted array
6) If you want to make a component opaque or transparent, what method do you use? setOpaque
7) What Java keyword do we use in the constructor of a class inheriting from another class if we want to call the constructor of the inherited class? super
8) What is the function of a GUI component? All of the above
9) Constructors Are accessible but are not inherited
10) When class B inherits from class A? A is the superclass and B is the subclass
11) To access the number of rows in a two-dimensional array named grades, we use grades.length
12) In order to handle an exception, we use a try and catch construct.
13) Which package does the JFrame class belong to? javax.swing
14) If you want to disable a component, what method do you use? setEnabled (parameter should be false)
15) To access the number of columns in row i of a two-dimensional array named grades, we use grades[ i ].length
16) Assuming the class B inherits from class A, then An object of class B is an object of class A
17) What keyword do we use in the class header that inherits from another class? extends
18) A linked list Can grow and shrink as items are added or deleted
19) The header of a method that potentially generates an exception when called contains the keyword throws
20) When creating a GUI application class, which class do we typically extend? JFrame

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