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| Section | Objectives |
|---|---|
| Data Storage and Persistence | - Record Management System (RMS) |
| Security Model | - Sandbox model and permissions - Signed MIDlets and trust levels |
| MIDlet Development | - User interface components and event handling - MIDlet lifecycle |
| Packaging and Deployment | - JAR/JAD packaging - Deployment to mobile devices |
| Java ME Architecture and Fundamentals | - Java ME platform architecture overview - CLDC (Connected Limited Device Configuration) - MIDP (Mobile Information Device Profile) |
| Networking and Communication | - Generic Connection Framework (GCF) - HTTP/HTTPS connections in Java ME |
Question 1
DRAG DROP
Click the Task button.
Place the appropriate platform label on the class name. If the class exists in both CLDC and J2SE, choose the "Exists in BOTH..." option, regardless of whether the package names are different.
Question 2
Given:
12. canvas.repaint(x1,y1,wd,ht);
13. canvas.repaint(x2,y2,wd,ht);
14. canvas.serviceRepaints();
Which two are true? (Choose two.)
A. paint() is always called twice, once for each repaint() request.
B. serviceRepaints() blocks waiting for paint() to return.
C. paint() is called three times, once for each repaint() and once for serviceRepaints().
D. If the two regions specified in repaint() overlap, repaint() may attempt to paint the union of the two areas.
Question 3
A game running on a J2ME device supporting MMAPI needs to play tones in the background of the game. It intermittently needs to play sounds of explosions.
The code has created two Player objects: one for tones and one for WAV audio.
How does the developer know if both audio streams can be heard simultaneously?
A. The developer knows playing audio streams simultaneously is supported because two Player objects have been created.
B. Playing audio streams simultaneously is NOT possible with any MMAPI implementation.
C. The developer can query the system using System.getProperty("supports.mixing");.
D. Playing audio streams simultaneously is only a request. The device determines whether to do so.
Question 4
Given:
1 0. //...
2 0. try {
2 1. Hashtable table = new Hashtable();
2 2. for (;;) table.put(new Object(), new Object());
2 3. } catch (OutOfMemoryException e) {
2 4. Display.getDisplay().setCurrent(new Alert("Out of Memory!"));
2 5. }
2 6. //...
Which is true?
A. Compilation fails.
B. Out of Memory! is printed to the system console.
C. The program hangs at line 22.
D. An exception is thrown at runtime but there is no guarantee an alert will be shown to the user.
Question 5
A MIDlet suite has the application descriptor fragment: MIDlet-1: E-mail, email.png, com.example.EmailMIDlet The MIDlet suite has the necessary permissions to use the PushRegistry. What line does the application descriptor need to register the MIDlet suite for socket push connections on port 79?
A. MIDlet-Push-1: socket://:79, E-mail, *
B. MIDlet-Push-1: socket://:79, MIDlet-1, *
C. MIDlet-Push-1: socket://:79, com.example.EmailMIDlet, *
D. MIDlet-Push-1: socket://:79, EmailMIDlet, *
Solutions:
| Question 1 Answer: Only visible for members | Question 2 Answer: B,D | Question 3 Answer: C | Question 4 Answer: D | Question 5 Answer: C |
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