Deck 12: Advanced Guis and Graphics

Question 1

The class Container is the superclass of all the classes designed to provide a GUI.

Answer 1

True

Question 2

An applet invokes the methods start, init, stop, paint, and destroy in sequence.

Answer 2

False

Question 3

The class Graphics is an abstract class.

Answer 3

True

Question 4

The R in RGB stands for Right.

Question 5

You can close an applet by closing the HTML document in which the applet is embedded.

Question 6

Applets do not have titles.

Question 7

You can create an applet by extending the class JFrame.

Question 8

The paint method is used to get data from the user.

Question 9

Like Java application programs, Java applets have the method main.

Question 10

Unlike application programs, when you compile a Java applet, no .class file is produced.

Question 11

The class Graphics provides methods for drawing items such as lines, ovals, and rectangles on the screen.

Question 12

The class JComponent is part of the package javax.swing.

Question 13

You cannot convert a GUI application into an applet.

Question 14

You can create instances of Color by mixing red, green, and blue hues in various proportions.

Question 15

JTextAreas can be used to display multiple lines of text.

Question 16

A Java applet is the same as a Java GUI application program.

Question 17

JCheckBox is a subclass of the abstract class ToggleButton.

Question 18

You can use the methods Background and Foreground to set the background and foreground colors of a component.

Question 19

Applets use the init method in place of constructors to initialize various GUI components and data members.

Question 20

You must import the package javax.swing in order to use the methods in the class Font.

Question 21

Clicking on a JCheckBox generates an item event.

Question 22

Which of the following sets the background color of the applet to white?

A) setAppletColor(white);
B) setBackground(white);
C) setBackground(Color.white);
D) setAppletColor(white);

Question 23

The graphic in the accompanying figure is an example of ____.

A) check boxes
B) radio buttons
C) a combo box
D) a text area

Question 24

Given Graphics object g, what method call is used to draw a line from X = 10, Y = 20 to X = 80, Y = 40?

A) g.drawLine(10, 80, 20, 40);
B) g.drawLine(10, 20, 80, 40);
C) g.drawLine(10, 20, 40, 80);
D) g.drawLine((10, 20), (80, 40));

Question 25

Given Graphics object graph, which statement can you use to change the pen color to red?

A) graph.setColor(Color.red);
B) graph.setPen(Color.red);
C) setForeground(red);
D) graph.getRed();

Question 26

How many inches is 12-point font?

A) 1/6
B) 1
C) 6
D) 72

Question 27

What class must be extended when you create an applet?

A) AWT
B) JDK
C) JApplet
D) Graphics

Question 28

A JComboBox generates an ItemEvent.

Question 29

JRadioButtons are useful when you want to give the user the ability to select more than one of the presented options.

Question 30

Applets are embedded in ____ documents.

A) HTTP
B) TCP
C) HTML
D) VRML

Question 31

Which of the following constructors would produce the color white?

A) Color whiteColor = new Color(0, 0, 0);
B) Color whiteColor = new Color(255, 0, 0);
C) Color whiteColor = new Color(255, 255, 0);
D) Color whiteColor = new Color(255, 255, 255);

Question 32

What class can be used to generate a random number?

A) JApplet
B) Graphics
C) Math
D) RandomNumber

Question 33

The layout manager FlowLayout places components in the container from left to right and centered, by default, until no more items can be placed.

Question 34

Does an applet compile like any other Java application program?

A) No -- applets do not produce a .class file because they don't have a main method.
B) Yes -- except the Web browser compiles the applet code.
C) Yes -- it is compiled as an application program and produces a .class file.
D) No -- applets are .applet files and not .java files.

Question 35

Which of the following methods does the class JTextArea inherit from the class JTextComponent?

A) setLineWrap()
B) setTabsize()
C) setColumns()
D) setText()

Question 36

If graph holds a Graphics object, which of the following puts "CAT" starting at X = 20, Y = 50?

A) drawString("CAT", 20, 50);
B) graph.drawString(20, 50, "CAT");
C) graph.println("CAT");
D) graph.drawString("CAT", 20, 50);

Question 37

Which applet method is called by the Web browser to display the applet to the screen?

A) drawApplet()
B) paint()
C) paintApplet()
D) setApplet()

Question 38

Item events are handled by the interface ItemListener, which contains only the abstract method itemStateChanged.

Question 39

Given Graphics object graph, which of the following draws a circle with a radius of 50, at X = 20, Y = 30?

A) graph.drawCircle(50);
B) graph.drawCircle(50, 50, 20, 30);
C) graph.drawOval(50, 50);
D) graph.drawOval(20, 30, 50, 50);

Question 40

To draw a rectangle filled with the current color, you can use the method ____.

A) drawRect()
B) fillRect()
C) drawOval()
D) fillOval()

Question 41

Which of the following is NOT included in the Java applet in the accompanying figure?

A) Check box
B) Radio button
C) Combo box
D) List

Question 42

Which of the following mouse events is handled by the interface MouseMotionListener?

A) mouseExited
B) mouseReleased
C) mouseDragged
D) mousePressed

Question 43

Which of the following is the default layout manager for a Java application?

A) null
B) GridLayout
C) FlowLayout
D) BorderLayout

Question 44

A mouse can generate ____ different types of events.

A) three
B) five
C) seven
D) nine

Question 45

When you press a meta key, the method ____ is executed.

A) metaKeyPressed
B) keyPressed
C) keyDown
D) keyTyped

Question 46

menuMB.add(fileMenu);
MenuMB.add(editMenu);
MenuMB.add(viewMenu);
MenuMB.add(insertMenu);Which menu will appear first if it is added to the menu bar in the order shown in the accompanying figure?

A) fileMenu
B) editMenu
C) viewMenu
D) insertMenu

Question 47

In which of the following layout managers do all rows (columns) have the same number of components and all components have the same size?

A) GridLayout
B) FlowLayout
C) BorderLayout
D) EvenLayout

Question 48

When you type a regular alphanumeric key, the ____ method is executed.

A) keyPressed
B) keyTyped
C) keyDown
D) keyUp