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Oracle Java Mobile Edition 1 Mobile Application Developer Certified Professional Sample Questions:

1. A MIDlet makes its only attempt to register a push connection on a JTWI device using:
PushRegistry.registerConnection(
"datagram://:79", midlet, "10.0.0.???");
Which is true?

A) The MIDlet accepts datagram push connections on port 79 only from IP addresses in the range 10.0.0.100 to 10.0.0.255 and on any other port from IP addresses other than those in the range 10.0.0.100 to 10.0.0.255.
B) The MIDlet accepts datagram push connections on port 79 only from IP addresses in the range 10.0.0.0 to 10.0.0.255.
C) The MIDlet accepts datagram push connections on port 79 only from IP addresses in the range 10.0.0.100 to 10.0.0.255.
D) The call to registerConnection() causes an exception, because the
string 10.0.0.??? is an illegal argument.

2. 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.

3. How would a MIDlet that uses a GameCanvas efficiently update only a small region of the screen, from the data in the off-screen buffer?

A) call flushGraphics(int, int, int, int) that specifies the region to be flushed
B) write extra code to coalesce the flushGraphics() calls over many loops into one call
C) call serviceRepaints() and set a clip region on the Graphics object in paint()
D) Pixels that are NOT to be flushed should be made transparent.

4. Given:
4 0. String outputString;
4 1. try {
4 2. Player p;
4 3. p = Manager.createPlayer("http://sun.com/barfoo.media");
4 4. p.setMediaTime(8000);
4 5. p.start();
4 6. outputString = "Playing!";
4 7. } catch (MediaException me) {
4 8. outputString = "Media Exception!";
4 9. } catch (IOException ioe) {
5 0. outputString = "IO Exception!";
5 1. }
Which is the result if the device does NOT support setting the media time on p?

A) outputString is set to "Media Exception!" and the media is NOT played.
B) outputString is set to "Playing!" with media playing from the beginning.
C) outputString is set to "IO Exception!" and the media is NOT played.
D) outputString is set to "Playing!" but the media is NOT played.

5. Which three statements are true regarding the handling of wireless connections? (Choose three.)

A) Network connections should never be performed on a separate thread, so problems can be handled quickly.
B) The connection could unexpectedly terminate while processing the input or output streams.
C) Performing network operations on the same thread used by the display is likely to block refreshes of the display until the network operations complete.
D) A network connection could interfere with other services on the device, such as the ability to receive phone calls or SMS on a phone.
E) Devices can only support one HttpConnection at a time; therefore, network access from multiple threads must be serialized.

Solutions: