java进阶复习题(共34页).doc

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1、精选优质文档-倾情为你奉上Name:_Covers Chs 29-31Sample ExamMultiple Choice Questions Only for This TestPart I: Questions: (1 pts each)1 You should always invoke the unlock method in the finally clause.A. true B. false 2 Given the following code, which set of code can be used to replace the comment so that the pr

2、ogram displays time to the console every second?import java.applet.*;import java.util.*;public class Test extends Applet implements Runnable public void init() Thread t = new Thread(this); t.start(); public void run() for(; ;) /display time every second System.out.println(new Date().toString(); A. t

3、ry Thread.sleep(1000); catch(InterruptedException e) B. try sleep(1000); catch(InterruptedException e) C. try Thread.sleep(1000); catch(RuntimeException e) D. try t.sleep(1000); catch(InterruptedException e) 3 Which of the following expressions must be true if you create a thread using Thread = new

4、Thread(object)?A. object instanceof Applet B. object instanceof Thread C. object instanceof Frame D. object instanceof Runnable 4 How do you create a condition on a lock?A. Condition condition = Lock.getCondition(); B. Condition condition = Lock.newCondition(); C. Condition condition = lock.getCondi

5、tion(); D. Condition condition = lock.newCondition(); 5 Which method on a condition should you invoke to causes the current thread to wait until the condition is signaled?A. condition.waited(); B. condition.await(); C. condition.waiting(); D. condition.wait(); 6 To run an object on a separate thread

6、, the object must be a subclass of Thread.A. true B. false 7 The Runnable interface is more general than the Thread class. You can convert any class that extends Thread to a class that implements Runnable.A. true B. false 8 An exception occurs if the resume() method is invoked by a finished thread o

7、bject.A. true B. false 9 You can set a priority for an object of ThreadGroup using the setPrority() method.A. false B. true 10 You must specify a name for the thread group that you will create.A. false B. true 11 You should not directly invoke the run() method of a thread object.A. true B. false 12

8、When creating a server on a port that is already in use, _.A. the server encounters a fatal error and must be terminated. B. the server is blocked until the port is available. C. the server is created with no problems. D. .BindException occurs. 13. To obtain an ObjectInputStream from a socket, use _

9、.a. socket.getInputStream()b. socket.getObjectStream()c. socket.getObjectInputStream()d. socket.objectInputStream()e. new ObjectInputStream(socket.getInputStream();Key:e14 You can invoke _ on a Socket object, say socket, to obtain an InetAddress object.A. socket.obtainInetAddress(); B. socket.InetAd

10、dress(); C. socket.retrieveInetAddress(); D. socket.getInetAddress(); 15 To connect to a server running on the same machine with the client, which of the following can be used for the hostname?A. InetAddress.getLocalHost(), B. 127.0.0.1 C. localhost D. All of the above. 16 The server listens for a c

11、onnection request from a client using the following statement:A. Socket s = serverSocket.accept() B. Socket s = new Socket(ServerName); C. Socket s = serverSocket.getSocket() D. Socket s = new Socket(ServerName, port); 17 The server can create a server socket regardless of whether the port is in use

12、 or not.A. true B. false 18 The client can connect to the server regardless of whether the port is in use or not.A. true B. false 19 You cannot get instances of InputStream or OutputStream because InputStream and OutputStream are abstract classes.A. true B. false 20 An applet cannot connect to a ser

13、ver program on a Web server where the applet was loaded.A. false B. true 21 You can transmit objects over the socket.A. false B. true 22 The URL constructor throws MalformedURLException if the URL is syntactically incorrect.A. true B. false 23 getInputStream() and getOutputStream() are used to produ

14、ce InputStream and OutputStream on the socket.A. false B. true 24 Which of the following statements are true?A. You can create an instance of NumberFormat using the static factory methods in NumberFormat. B. You can create an instance of DecimalFormat using new DecimalFormat(Local). C. DecimalFormat

15、 is a subclass of NumberFormat. D. An instance created using the static factory methods in NumberFormat is also an instance of DecimalFormat. E. You can create an instance of NumberFormat using new NumberFormat(Local). 25 Which of the following are in the java.text package?A. DateFormat B. SimpleDat

16、eFormat C. DateFormatSymbols D. Date E. Locale 26 Which of the following code is correct to obtain hour from a Calendar object cal? A. cal.getHour(); B. cal.get(Hour); C. cal.get(Calendar.HOUR); D. cal.hour(); 27 How do you create a locale for the United States? A. new Locale(en, US); B. new Locale(

17、US, en); C. Locale.getLocale(en, US) D. Locale.US; 28 A resource bundle is _A. a Java class file or a text file that provides locale-specific information. B. a Java source code the contains image, audio, and text files. C. an audio file. D. an image file. 29 To display number in desired format, you

18、have to use the NumberFormat class or its subclasses.A. true B. false 30 You can find all the available locales from a Swing object.A. true B. false 31 The locale property is in the Component class, thus, every Java Swing component has the locale property.A. true B. false 32 You can get year, month,

19、 day, hour, minute, and second from an instance of GregorianCalendar.A. true B. false 33 You can get hour, minute and second from the Date class.A. false B. true 34 The TimeZone class has a static method for obtaining all the available time zone IDs.A. false B. true 35 You can get all the available

20、locales from an instance of Calendar, Collator, DateFormat, or NumberFormat.A. false B. true Keys:1. A2. A3. D4. D5. B6. A7. A8. A9. A10. B11. A12. D13. D14. D15. D16. A17. B18. A19. B20. B21. B22. B23. B24. ACD25. ABC26. C27. AD28. A29. A30. B31. A32. A33. A34. B35. BName:_Covers Chs 32-35Sample Ex

21、amMultiple Choice Questions Only for This TestPart I: Questions: (1 pts each)1 An event adapter can be implemented using _.A. standard adapter B. inner class adapter C. anonymous inner class adapter 2 The signature for the accessor method of a Date property birthDate should be _.A. public java.util.

22、Date birthDate() B. public java.util.Date getBirthDate() C. private java.util.Date birthDate() D. private java.util.Date getBirthDate() E. public java.util.Date getbirthDate() 3 The signature for the mutator method of a Date property birthDate should be _.A. public void birthDate(java.util.Date date

23、) B. public void setBirthDate(java.util.Date date) C. public void setbirthDate() D. public void birthDate() 4 An event and its corresponding listener is referred to as _.A. an event set B. an event class C. an event pair D. an event object 5 Which of the following is true?A. A bean must implement th

24、e java.io.Serializable interface to ensure a persistent state. B. A bean must be a public class. C. A bean must have a public no-arg constructor. D. A bean cannot have any constructors with parameters. 6 The signature for the accessor method of a Boolean property visible should be _.A. public boolea

25、n visible() B. public boolean getVisible() C. public static boolean isVisible() D. public boolean isVisible() E. private boolean isVisible() 7 Any event is an instance of _.A. java.awt.ActionEvent B. javax.swing.JComponent C. java.awt.Component D. java.util.EventObject 8 5 Creating Custom Event Sets

26、 10. Which of the followings are true? A. By convention, an event class should be named with suffix Event. B. An event class does not have a no-arg constructor, because you must always specify a source for the event when creating an event. C. A custom event class must extend java.util.EventObject or

27、 a subclass of java.util.EventObject. D. A custom event listener interface must extend java.util.EventListener or a subinterface of java.util.EventListener, and define the signature of the handlers. E. A listener interface for a custom event BeatEvent should be named BeanListener by convention. 9 Wh

28、ich of the following is true?A. Events can be unicasted (only one listener object is notified of the event). B. Events can be multicasted (each object in a list of listeners is notified of the event). C. The naming pattern for adding a multicast listener is public void addListener(Listener l) D. The

29、 naming pattern for adding a unicast listener is public void addListener(Listener l) throws TooManyListenersException E. A source component must have the appropriate registration and deregistration methods for adding and removing listeners. 10 The signature for the mutator method of a Date property

30、birthDate should be _.A. public void birthDate(java.util.Date date) B. public void setbirthDate() C. public void birthDate() D. public void setBirthDate(java.util.Date date) E. public void setBirthDate(java.util.Date date) 11 Any listener is an instance of _.A. java.util.EventListener B. javax.swing

31、.JComponent C. java.util.EventObject D. java.awt.ActionListener 12 The signature for the registration method for an ActionEvent should be _.A. public void addActionListener(ActionEvent l) B. public void setAction(ActionListener l) C. public void setActionListener(ActionListener l) D. public void add

32、ActionListener(ActionListener l) 13 The size of a component in a container is determined by _ A. the type of layout manager used by the container. B. certain properties common to all components (such as preferredSize, minimumSize, maximumSize, alignmentX, and alignmentY). C. the size of the containe

33、r. D. the layout constraints associated with each component. 14 Which of the following properties are in JApplet?A. title B. contentPane C. resizable D. jMenuBar E. iconImage 15 _ is a Swing layout manager that arranges components on top of each other.A. BorderLayout B. BoxLayout C. CardLayout D. Ov

34、erlayLayout E. GridLayout 16 Which of the following properties are in BorderLayout?A. alignment B. hgap C. layout D. vgap E. visible 17 Which of the following methods create an EtchedBorder?A. BorderFactory.createEtchedBorder(Color.YELLOW, Color.RED) B. new EtchedBorder() C. new EtchedBorder(Color.Y

35、ELLOW, Color.RED) D. BorderFactory.createEtchedBorder() 18 Which of the following properties are in JFrame?A. jMenuBar B. title C. iconImage D. resizable E. contentPane 19 Which of the following properties are in CardLayout?A. visible B. alignment C. vgap D. layout E. hgap 20 The preferredSize prope

36、rty is ignored in _.A. FlowLayout B. BorderLayout C. GridLayout D. Null layout 21 Which of the following are the valid methods in JTabbedPane?A. getToolTipTextAt(index) B. getTabCount() C. getTabPlacement() D. getTitleAt(index) 22 To use no layout manager in a container c, use _.A. c.setLayout(NullL

37、ayout) B. c.setLayout(null) C. c.setLayout() D. c.setLayout(new NullLayout() 23 Every layout manager is an instace of _.A. the LayoutManager interface B. the LayoutManager class C. the Layout class D. the Layout interface 24 Which of the following methods create a LineBorder?A. new LineBorder() B. B

38、orderFactory.createLineBorder(Color.YELLOW) C. new LineBorder(Color.YELLOW, 3) D. new LineBorder(Color.YELLOW, 3, true) E. BorderFactory.createLineBorder(Color.YELLOW, 4) 25 Which of the following properties in java.awt.Component may effect layout?A. font B. background C. minimumSize D. maximumSize

39、E. preferredSize 26 You can construct a JScrollPane using _.A. new JScrollPane(Component) B. new JScrollPane(Component) C. new JScrollPane() D. new JScrollPane(Component, Component) 27 _ is a Swing layout manager that arranges components in a row or a column.A. GridLayout B. FlowLayout C. BorderLayo

40、ut D. BoxLayout E. CardLayout 28 Which of the following properties are in CardLayout?A. hgap B. alignment C. visible D. layout E. vhap 29 How do you display a JPopupMenu?A. Add the JPopupMenu to a container. B. Invoke the setVisible(true) from a JPopupMenu. C. Invoke the show() from a JPopupMenu. D.

41、 Invoke the show(Component, x, y) from a JPopupMenu. 30 _ is the action that causes a popup menu to be displayed.A. Popup trigger B. Popup action C. Popup reaction D. Popup event 31 A JRadioButtonMenuItem is a subclass of _.A. JMenuItem B. AbstractButton C. JMenu D. JComponent 32 A JCheckBoxMenuItem

42、 is a subclass of _.A. AbstractButton B. JComponent C. JMenuItem D. JMenu 33 The method _ places a menu item mi into a menu mu.A. mu.addMenuItem(mi) B. mu.add(mi) C. None of the above. D. mu.addItem(mi) 34 _ allows you to create custom buttons.A. A confirmation dialog B. An input dialog C. A message

43、 dialog D. An option dialog 35 _ displays a message that alerts the user and waits for the user to click the OK button to close the dialog.A. A message dialog B. An input dialog C. An option dialog D. A confirmation dialog 36 You can add a menu item into set an imageIcon property on _.A. a JMenuItem

44、 B. a JRadioButtonMenuItem C. a JMenu D. a JCheckBoxMenuItem 37 A MenuItem object can generate _ events.A. ComponentEvent B. ActionEvent C. ItemEvent D. ContainerEvent 38 _ is used to receive input from the user. A. An option dialog B. A confirmation dialog C. A message dialog D. An input dialog 39

45、Which of the following statements are true?A. You can add a JMenu to a JPopupMenu. B. You can add a JMenuItem to a JPopupMenu. C. You can add a JPopupMenu to a JMenu. D. You can add a JCheckBoxMenuItem to a JPopupMenu. E. You can add a JRadioButtonMenuItem to a JPopupMenu. 40 How do you display a JP

46、opupMenu?A. Invoke the show(Component, x, y) from a JPopupMenu. B. Add the JPopupMenu to a container. C. Invoke the setVisible(true) from a JPopupMenu. D. Invoke the show() from a JPopupMenu. 41 You can set an imageIcon property on _.A. a JRadioButtonMenuItem B. a JCheckBoxMenuItem C. a JMenuItem D. a JMenu 42 The method _ places a menu mu into a menu bar mb.A. mb.addMenuItem(mu) B. mb.addItem(mu) C. mb.add(mu) D. None of the above. 43 The method _ separates menu item