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Essentials of the JavaTM Programming Language
(Part II)

by Dana Nourie and Monica Pawlan

Duke The Essentials of the JavaTM Programming Language is a great resource to explore the JavaTM platform. Take this short quiz to test your knowledge of exceptions, applet and database permissions, and RMI from Part I, and keywords, graphic user interfaces, and collection interfaces from Part II.
  1. All exceptions except java.lang.RuntimeException and its subclasses are checked exceptions.
     A. True
     B. False

  2. Two methods from the exception and error classes are useful for debugging an application during development. One of the methods is called a printStackTrace(). Another useful method for understanding errors is:
     A. setActionCommand()
     B. getData()
     C. setBounds()
     D. toString()

  3. The JavaTM 2 platform security imposes restrictions on applets without explicit permissions to do the following:
     A. Display images
     B. Accept user input
     C. Write to system files
     D. Initialize data in the browser

  4. In order to determine what permissions an applet's policy file needs to access a database, read the error messages from the:
     A. IOException method
     B. stack trace
     C. IllegalActionException Statement
     D. Datagram Packet

  5. In Lesson 7, the database application prevents outside classes from accessing the database driver, the user name, and the password by declaring these variables as:
     A. public final
     B. protected final
     C. private final
     D. primitive data types

  6. To run the RMI application in Lesson 8, you must first start:
     A. RMI Client 1
     B. RMI Registry
     C. Remote Server
     D. Send.java

  7. What does a multithreaded server do?
     A. Handles threads for each communication it accepts from a client
     B. Uses and throws built-in IOExceptions
     C. Listens and handles events through the ActionListner interface
     D. Restricts threads with accessEventQueue

  8. The synchronized keyword is used to:
     A. Run threads simultaneously
     B. Obtain a lock on an object
     C. Instantiate multiple objects
     D. Instantiate methods concurrently

  9. The actionPerformed method in a user interface handles action events such as:
     A. Button-clicks and text field returns
     B. Data passing from GUI to server
     C. Multithread handling
     D. Database entries

  10. The List interface implementation permits duplicate elements in a collection object.
     A. True
     B. False


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[ This page was updated: 9-Aug-2000 ]
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