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

1. Given:
A record store has three records: Record 1 contains Apple, Record 2 contains Mango, Record 3 contains Cherry, and the RecordComparator class:
1 . public class CompareTest implements RecordComparator {
2 . public int compare(byte[] rec1, byte[] rec2) {
3 . String str1 = new String(rec1), str2 = new String(rec2);
4 . int result = str2.compareTo(str1);
5 . if (result == 0)
6 . return RecordComparator.EQUIVALENT;
7 . else if (result < 0)
8 . return RecordComparator.PRECEDES;
9 . else
1 0. return RecordComparator.FOLLOWS;
1 1. }
1 2. }
What is the return order of the records for an enumerator using CompareTest?

A) Mango, Apple, Cherry
B) Apple, Mango, Cherry
C) Mango, Cherry, Apple
D) Cherry, Apple, Mango
E) Cherry, Mango, Apple
F) Apple, Cherry, Mango

2. Given:
10. //...
2 0. int[] foo = new int[10000];
2 1. foo = null;
2 2. System.gc();
2 3. //...
Which is true once the program execution reaches line 23?

A) The garbage collector CANNOT reclaim the memory allocated to foo because the reference is nulled out.
B) The garbage collector suspends the program until more memory becomes available.
C) The garbage collector is triggered and memory is guaranteed to be reclaimed.
D) The garbage collector is triggered but there are no guarantees that any memory has been reclaimed.

3. Which guarantees the application can be installed without push registration conflicts?

A) It is NOT the responsibility of the MIDlet to resolve these conflicts. The installer does this automatically.
B) The MIDlet specifies the push registration in the JAD, but will register dynamically if there is a conflict.
C) The MIDlet tries to register the connection dynamically after installation.
D) The MIDlet specifies multiple push registration strings in the JAD.

4. Which two are true? (Choose two.)

A) Synchronous painting to the device display is possible with GameCanvas.
B) GameCanvas always needs a separate thread to draw anything on the screen.
C) Canvas.serviceRepaints() and Canvas.callSerially() can be used to create a constant frame-rate animation loop.
D) paint() is never called for GameCanvas subclasses.

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, com.example.EmailMIDlet, *
C) MIDlet-Push-1: socket://:79, EmailMIDlet, *
D) MIDlet-Push-1: socket://:79, MIDlet-1, *

Solutions: