Deck 6: Graphical User Interface GUI and Object-Oriented Design OOD

Question 1

If lengthTF is a JTextField and pane is a container, then the statement pane.add(lengthTF); adds the text field to the content pane of a window.

Answer 1

True

Question 2

Whenever there is a superclass-subclass relationship, the superclass inherits all data members and methods of the subclass.

Answer 2

False

Question 3

Every window has a title, width, and height.

Answer 3

True

Question 4

The class Container is included in the package java.awt.

Question 5

The class JFrame contains the method setSize.

Question 6

The GridLayout manager arranges GUI components in a list formation.

Question 7

In object-oriented design, the nouns found in the problem specification can be used to select the operations in the program.

Question 8

The height and width of a window are measured in inches.

Question 9

In Java, data members are also known as fields.

Question 10

In Java, extends is a reserved word.

Question 11

The method getContentPane of the class JFrame is used to access the content pane of the window.

Question 12

When you click a JButton, an event, known as an action event, is created.

Question 13

GUI components are placed in a window called JFrame.

Question 14

The first step in solving a problem using object-oriented design is to identify objects.

Question 15

JTextFields are used to get input, but not show output.

Question 16

An interface is a class that contains only the method headings and each method heading is terminated with a semicolon.

Question 17

The method addWindowListener is included in the class JFrame.

Question 18

In object-oriented design, the verbs in the problem specification can be used to identify the objects in the program.

Question 19

The class ActionListener contains only one method, actionEvent.

Question 20

In Java, there is one way to make an application program create a window.

Question 21

To create a window, which of the following classes has to be extended?

A) Container
B) JFrame
C) JButton
D) JTextField

Question 22

Which of the following is NOT found within the content pane?

A) labels
B) title bar
C) text areas
D) buttons

Question 23

To display a window, you must invoke the method ____.

A) displayWindow
B) show
C) setVisible
D) setDisplay

Question 24

Which of the following is NOT a required attribute of a window?

A) title
B) width
C) height
D) color

Question 25

Which of the following sets the window width to 100 pixels and the height to 200 pixels?

A) setSize(100, 200);
B) setSize(200, 100);
C) setDims(100, 200);
D) set(200, 100);

Question 26

If Shape is a class and you create a new class Rectangle that extends Shape, then Shape is a(n) ____ and Rectangle is a(n) ____.Which word goes in the first blank in the sentence above?

A) subclass
B) superclass
C) inherited class
D) package

Question 27

To determine whether two reference variables of the Integer type point to the same Integer object, we can use either the method equals of the class Integer or the operator ==.

Question 28

Which of the following methods is NOT part of the class JFrame?

A) setVisible
B) setSize
C) setTitle
D) getText

Question 29

Which of the following from the window above is a JButton?

A) Calculate
B) Exit
C) Both Calculate and Exit
D) Perimeter

Question 30

The Java class that you use to create windows is ____.

A) JTextField
B) JFrame
C) JButton
D) JLabel

Question 31

Wrapper class objects are mutable.

Question 32

Which of the following is a reserved word in Java?

A) extends
B) pane
C) event
D) inheritance

Question 33

A(n) ____ is a method of a class that is automatically executed when an object of the class is created.

A) inheritance
B) package
C) constructor
D) interface

Question 34

Given the declaration, Integer x; After executing either of the following two statements, x points to an Integer object with value 8: x = 8;x = new Integer(8);

Question 35

Given the declaration, Integer num; The statement num = 8; is known as autoboxing of int type.

Question 36

To compare the values of two Integer objects for equality, we can use the method equals of the class Integer.

Question 37

The white areas in the figure above are used to do which of the following?

A) Show output
B) Get input
C) Get input and show results
D) Display a prompt to the user

Question 38

Which class is part of the package java.awt?

A) JFrame
B) JButton
C) JOptionPane
D) Container

Question 39

If Shape is a class and you create a new class Rectangle that extends Shape, then Shape is a(n) ____ and Rectangle is a(n) ____.Which word goes in the second blank of the sentence above?

A) subclass
B) superclass
C) method
D) package

Question 40

Which of the following statements is NOT true about GUI programs?

A) Every GUI program requires a window.
B) Every window has a title, width, and height.
C) All components are added directly to the GUI window.
D) A layout must be created before components can be added to a content pane.

Question 41

Which of the following is not a method of the class JTextField?

A) setText
B) setEditable
C) addActionListener
D) setVisible

Question 42

Write a program that takes as input the pay rate and hours worked of an employee and calculates the pay of the employee.Based on the problem statement above, which of the following would most likely be chosen as the class?

A) Pay_Rate
B) Hours_Worked
C) Employee
D) Pay

Question 43

Which method is used to register a listener object to a button object?

A) addActionListener
B) registerButton
C) eventButton
D) buttonListener

Question 44

Write a program to input the radius of the base and height of a cylinder, and calculate and print the surface area, volume, and area of the base of the cylinder.Which words from the problem statement above could we use to determine the operations for this program?

A) input, calculate, print
B) cylinder, program, volume
C) height, cylinder, radius
D) radius, cylinder, print

Question 45

What is the name for Java classes that are provided so that values of primitive data types can be treated as objects?

A) interfaces
B) extensions
C) wrappers
D) event handlers

Question 46

Which modifier is used to build classes on top of classes that are interfaces?

A) private
B) public
C) new
D) implements

Question 47

Which method contains the code that the program executes when a specific event is generated?

A) buttonListener
B) GUIListener
C) actionPerformed
D) windowListener

Question 48

Write a program that takes as input the pay rate and hours worked of an employee and calculates the pay of the employee.Based on the problem statement above, which of the following would be a data member?

A) hoursWorked
B) employee
C) pay
D) job

Question 49

Which package will you most likely have to import in order to write a GUI program?

A) java.awt.*
B) java.io.*
C) java.text.*
D) java.net.*

Question 50

Write a program to input the radius of the base and height of a cylinder, and calculate and print the surface area, volume, and area of the base of the cylinder.According to the problem statement above, which of the following would be a data member?

A) Radius of the base
B) Surface area
C) Volume
D) Input