J2ME Online Exams Test2

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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. If any shared attributes are different, then:
The ones in the descriptor override those in the manifest	The ones in the manifest override those in the descriptor
All of the above	None of the above

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
All of the above	None of the above

7. Midlets from different suites:
Can interact directly	Cannot interact directly
All of the above	None of the above

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
All of the above	None of the above

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	Canvas

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");m	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