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Chapter 19

Chapter 19

Swing II

This activity contains 15 questions.

	If you do not explicitly use setDefaultCloseOperation to change the default policy to DO_NOTHING_ON_CLOSE:   The main window always will close, even if you've attempted to change the policy The main window will close when you invoke the dispose method in your event listener The main window will continue if you have provided a listener that takes some other action The main window will terminate, even if you have provided a listener that takes some other action

	If you omit a call to super.paint(g);:   The enclosing JFrame or component may fail to display correctly Your program may enter an infinite loop, since paint may be invoking itself None of these alternatives is correct Your program will execute more quickly because such a method call is redundant

	Java's color system provides 8 bits for the specification red, green, blue components. This means that the number of different colors available to Java is   256 16.7 million 65 million 65,000

	The paintComponent method:   is used when you are painting within JPanels None of these alternatives is true is used when you are painting within JFrames is used when you are painting within JPanels, JButtons, or JMenus

	The repaint method:   immediately calls paint is redundant - one should use validate instead None of the alternatives is true should be called when you want to force a repainting of the display due to a change in the state of the program

	The validate method:   Is associated with every Component When applied to the content pane, it will guarantee that the visual representation is up-to-date Always should be invoked immediately after making any change to a JButton or JLabel Never should be invoked on the content pane since doing so is so inefficient

	The advantages/disadvantages of extending the WindowAdapter class is (are): There is less to type; fewer chances for syntax errors It is easier just to override the few necessary methods A typo in the name of one of the WindowListener methods will go undetected This approach yields shorter code   True: (a), (d) True: All but (c) True: All of the above True: All but (d)

	The reason(s) that you might redefine the paint method is (are): You want every component to display correctly You want to utilize drawing (painting) methods such as drawString or fillRect You want to change the appearance of a component You never should redefine the paint method - doing so will cause the Java drawing system to fail   True: (b) True: (b), (c) True: (c) True: (a), (b), (c)

	When specifying (creating) a new Font in Java, you specify: The name of the font The attributes of the font (e.g., bold) The color of the font (e.g., black) The size of the font, in pixels   Correct: All of the above Correct: Only (b) Correct: (a), (b) Correct: (a), (b), (d)

	Which statement(s) is (are) true about Java arcs? The rectangle that is used in conjunction with drawArc fits within the arc The rectangle that is used in conjunction with drawArc surrounds the arc The rectangle that is used in conjunction with drawArc is sometimes call a "bounding box" The center of the rectangle that is used in conjunction with drawArc is the same as the point that is the "center" of the arc   True: (a), (c), (d) True: (b), (c) True: (a), (c) True: (b), (c), (d)

	Which statement(s) is (are) true about the dispose method? dispose is a JFrame method dispose will terminate the JFrame and release any resources used by the JFrame dispose will terminate the enclosing JFrame, JApplet, etc., even if there are other active or open windows dispose will terminate the enclosing program as well if there are no other active, open windows   True: (b), (d) True: All of the above True: (a), (c), (d) True: (a), (b), (d)

	Which statement(s) is (are) true about the setVisible method? setVisible may be used on any component setVisible may be used on icons and labels, but not on buttons or frames setVisible may be used on icons, labels, buttons, but not on menu items setVisible causes not only the component in question to become (in-)visible, but the enclosing component(s) as well   True: (c), (d) True: (b), (d) True: Only (a) True: All of the above

	Which statement(s) is (are) true of the setIcon method? can be used to insert an icon into a JLabel can be used to insert an icon into a JButton can be used to insert an icon into a JMenuItem can be used to insert an icon into a JFrame can be used to insert an icon into a JApplet   True: All but (e) True: All of the above True: (a), (b) True: (a), (b), (c)

	Which statement(s) is (are) true? setText and setIcon can be used to set the text and icon associated with a JButton, JLabel, or JMenuItem These methods only may be invoked once, when the associated component first is created These methods are redundant in the sense that by use of an appropriate constructor they need not be used at all The order in which these methods are invoked is irrelevant - either may be invoked before the other with the same visual effect   True: (c), (d) True: All but (b) True: (a), (d) True: All of the above

	Which statement(s) is (are) true? You may add scroll bars to a text field You may add scroll bars to a text area Scroll bars will appear automatically, whenever they are needed You can force scroll bars to be visible all the time, if you wish   True: (b), (d) True: All but (a) True: All of the above True: (b), (c)

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