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Exam : SUN 310-110
Title : Sun Certified Mobile Application Developer for J2ME, V1.0


1. //...
20. try {
21. Hashtable table = new Hashtable();
22. for (;;) table.put(new Object(), new Object());
23. } catch (OutOfMemoryException e) {
24. Display.getDisplay().setCurrent(new Alert("Out of Memory!"));
25. }
26. //...
Which is true?
A. Compilation fails.
B. The program hangs at line 22.
C. Out of Memory! is printed to the system console.
D. An exception is thrown at runtime but there is no guarantee an alert will be shown to the user.
Answer: D

2. Click the Exhibit button. The red collision rectangle around each Sprite in the image is NOT part of the actual image. The two Sprite objects intersect in the application precisely as shown. Which two are true? (Choose two.)
A. For the two Sprite objects to be considered in collision, each Sprite must have no more than one frame.
B. For the two Sprite objects to be considered in collision, collidesWith() must be invoked on both objects.
C. The most efficient way to detect collision is to use collision detection based solely on the collision rectangles.
D. If Sprite 1 is being tested for collision with Sprite 2 using pixel-level collision detection, the two Sprite objects will NOT be in collision.
Answer: CD

3. The developer is designing a game that uses the LayerManager and Sprite classes. Three Sprite objects are added to a LayerManager object and a call is placed to the LayerManager.paint(Graphics, x, y) method. In what order are the Sprite objects rendered to the device display?
A. The Sprites are rendered in a random order.
B. The Sprites that are animated are rendered first.
C. The Sprites are rendered in order of descending index.
D. The Sprites are rendered in an implementation specific manner.
Answer: C

4. A MIDlet has entered the paused state. Which is a valid action to attempt to make it active?
A. The MIDlet calls its own startApp() method.
B. The MIDlet has to wait quietly to be rescheduled.
C. The MIDlet cannot revert back to the active state.
D. The MIDlet calls resumeRequest() through a timer.
Answer: D

5. Which is true regarding the use of Thread objects in a CLDC 1.1 compliant virtual machine?
A. To stop a Thread, a developer can use the stop() method.
B. A Thread can be stopped only from the inside of a MIDlet class.
C. There is no way for one Thread to force another Thread to stop.
D. A Thread lives until it exits from the run() method it invoked at startup.
Answer: D

6. What is the minimum volatile memory requirement identified by the CLDC 1.1 specification?
A. 32 KB
B. 64 KB
C. 128 KB
D. 160 KB
Answer: A

7. Given:
10. //...
20. try {
21. Hashtable table = new Hashtable();
22. for (;;) table.put(new Object(), new Object());
23. } catch (OutOfMemoryException e) {
24. Display.getDisplay().setCurrent(new Alert("Out of Memory!"));
25. }
26. //...
Which is true?
A. Compilation fails.
B. The program hangs at line 22.
C. Out of Memory! is printed to the system console.
D. An exception is thrown at runtime but there is no guarantee an alert will be shown to the user.
Answer: D

8. Given:
a JAR containing a MIDlet named TesterMIDlet
a JAD with this content: CertificationExam:
Sun Certified Mobile Application DeveloperMIDlet-1: TesterMIDlet, , certification.TesterMIDlet MIDlet-Jar-Size: 2038 MIDlet-Jar-URL: Certification.jar MIDlet-Name: Certification MIDlet-Vendor: A Testing Company MIDlet-Version: 1.0 MicroEdition-Configuration: CLDC-1.0 MicroEdition-Profile: MIDP-2.0
This MIDlet needs to get the property with the key CertificationExam defined in the JAD. This needs to be assigned to a String ExamName from within the MIDlet.startApp() method.
What is the correct way to accomplish this?
A. String ExamName = System.getProperty("CertificationExam");
B. String ExamName = this.getAppProperty("CertificationExam");
C. String ExamName = System.getProperty("MIDlet-CertificationExam");
D. String ExamName = this.getAppProperty("MIDlet-CertificationExam");
Answer: B

9. Which two are true about class file verification as defined by the CLDC specification? (Choose two.)
A. Verification is NOT required.
B. Verification can use a custom implementation.
C. Verification is completed at compile time and no further verification is necessary.
D. Verification can use the same implementation as defined in the JVM specification.
Answer: BD

10. A MIDP 2.0 developer is building a game using the MIDP game API that requires user control over the direction of a Sprite within a GameCanvas. The developer wants to keep performance high and reduce memory use. Which two fulfill the goals? (Choose two.)
A. suppress key events for the GameCanvas object
B. implement keyPressed(), keyReleased(), and keyRepeated()
C. poll for the current state of user key input in a loop, using getKeyStates()
D. in the GameCanvas object, use actual key codes rather than mapped game action constants
Answer: AC

11. During a MIDlet suite installation, a JTWI-compliant device performs the following actions:
downloads and installs the JAD file
downloads the JAR file
fails to install the MIDlet suite
What is the correct behavior?
A. The device must log the failure in persistent storage.
B. The device must free the space allocated for that MIDlet suite.
C. The device must save the JAD and the JAR file for future upgrading.
D. The device must save the JAD file for future downloads of the same MIDlet suite.
Answer: B

12. Given a MIDlet suite with the following JAD file:
1. MIDlet-1: MyMIDlet, MyMIDlet.png, MyMIDlet
2. MIDlet-Jar-Size: 23040
3. MIDlet-Name: MyFirstMIDlet
4. MIDlet-Version: 1.0
5. MIDlet-Jar-URL: http://mywebserver.com/mymidlets/MyMIDlet.jar
6. MIDlet-Vendor:
MyCompany and manifest file:
1. MIDlet-Name: MyFirstMIDlet
2. MIDlet-Version: 1.1
3. MIDlet-Vendor: MyCompany
4. MIDlet-1: MyMIDlet, MyMIDlet.png,
MyMIDlet Which is true about the installation?
A. The installation succeeds.
B. The installation fails due to an attribute mismatch.
C. The installation fails because the JAD file is invalid.
D. The installation fails because the manifest is invalid.
Answer: B

13. Given the MIDlet code:
12. File f = new File("myFile.txt");
13. FileOutputStream ds = new FileOutputStream(f);
14. OutputStreamWriter os = new OutputStreamWriter(ds);
15. BufferedWriter buf = new BufferedWriter(os);
16. buf.write('c');
What is the result?
A. The code compiles and runs, but line 16 is ignored.
B. Compilation succeeds, but an exception is thrown at runtime.
C. The code compiles and runs, and then writes the character c to the file myFile.txt.
D. Compilation fails because the code uses one or more classes, which are not supported in CLDC 1.1.
Answer: D

14. Which is used to retrieve the version of MIDP a device has implemented?
A. System.getProperty("microedition.profiles")
B. System.getProperty("microedition.platform")
C. System.getAppProperty("microedition.platform")
D. System.getAppProperty("microedition.profiles")
E. System.getProperty("microedition.configuration")
Answer: A