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Quiz for J2ME





1. A midlet is a Java class that extends the abstract class:

javax.microedition.MIDlet
javax.microedition.midlet
javax.microedition.midlet.MIDlet
javax.microedition.midlet.midlet

2. Which one of the following methods of the MIDlet abstract class must be implemented by a midlet:

initApp, startApp
startApp, destroyApp
startApp, pauseApp, destroyApp
initApp, startApp, pauseApp, destroyApp

3. After compiling your midlet, you must process it with a command to ensure that it is valid before use by the Kilo virtual machine (KVM). What is the name of that command?

midp
javac-bootclasspath
preverify
jar

4. A Java Application Descriptor (JAD) file is a text file that is similar to a manifest, except that it is not packaged in a JAR file. Some of the shared attributes that must have identical values are: MIDlet-Name, MIDlet-Version, and MIDlet-Vendor.

The ones in the descriptor override those in the manifest
The ones in the manifest override those in the descriptor


5. When downloading application descriptors (.jad files) from a web server, the web server must return a MIME type of:

text/vnd.sun.j2me.midp
text/vnd.sun.j2me.jad
text/vnd.sun.j2me.app-descriptor
text/vnd.sun.j2me.midapp

6. A midlet suite is a set of midlets that are packed together into a single JAR file. Midlets within the same suite:

Can share the classes and resources contained in the JAR file
Cannot share the classes and resources contained in the JAR file


7. Midlets from different suites:

Can interact directly.
Cannot interact directly.


8. What is the difference between a configuration (such as the CLDC) and a profile (such as the MIDP)?

a configuration defines the set of class libraries available for a particular domain of devices, and a profile provides I/O and network APIs.
a configuration defines a vertical set of classes that a profile can use.
a configuration defines a minimum set of class libraries for a wide range of devices, and a profile defines the set of APIs available for a particular family of devices.
a profile is the foundation for a configuration.

9. All MIDP implementations are required to support what image format?

GIF
JPG
BMP
PNG

10. If a midlet needs to receive high-level events from the implementation, which interface should it implement?

ActionListener
CommandListener
Windows Listener
ChoiceListener

11. All MIDP GUI classes are contained in what package?

javax.microedition.gui
javax.microedition.lcd
javax.microedition.lcdui
javax.microedition.display

12. The MIDP user interface API is a subset of the AWT/ Project Swing libraries.

True
False


13. Which class would you use to write applications to access low-level input events or to issue graphics calls for drawing to the display?

Display
Command
Screen
Screen

14. Which of the following statements is true regarding the Generic Connection framework:

The CLDC provides an implementation for the HTTP protocol.
All MIDP implementations must provide support for the HTTP protocol.
The MIDP provides implementation for datagram and socket connections.
The Connection interface is part of the java.net package.

15. The heart of the Generic Connection framework is:

javax.microedition.Connection
javax.microedition.Connector
javax.microedition.StreamConnection
javax.microedition.HttpConnection

16. What is the correct syntax, using the Generic Connection framework, to open an HTTP connection:

Connection c = Connection.open("http://developer.java.sun.com");
Connector c = Connector.open("http://developer.java.sun.com");
Connection c = Connector.open("http://developer.java.sun.com");
Connector c = Connection.open("http://developer.java.sun.com");

17. The MIDP provides a mechanism for MIDlets to persistently store data in a platform-dependent file and retrieve it later. This mechanism is:

Object Serialization
JDBC
RMS
ODBC

18. A Java virtual machine1 (JVM) supporting CLDC has no support for:

Floating point numbers
Reflection
JNI
All of the above

19. Which of the following non-exception classes are inherited from the Java 2 Standard Edition 1.3 java.util package by the CLDC:

Calendar, Date, Enumeration, Hashtable, Stack, Vector
Calendar, Date, Enumeration, Hashtable, Random, Stack, Timer, Vector
Calendar, Date, Enumeration, Hashtable, Stack, Vector, StringTokenzier
All of the java.util classes are inherited

20. Which of the following techniques can be used for wireless session tracking?

Cookies
URL Rewriting
Hidden Fields
None of the above



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