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

1. Given a MIDlet that specifies a push registration in the JAD file as:
MIDlet-Push-1: socket://:79, com.sun.example.SampleChat, *
What is the result when the MIDlet is installed onto a device where another MIDlet has already registered the exact same push connection in the PushRegistry?

A) The MIDlet installs and overwrites any existing push registrations.
B) The MIDlet installation is aborted and the user is notified of the problem.
C) The connection can only apply to the currently running MIDlet.
D) The MIDlet installs, but the connection CANNOT be used.
E) The MIDlet installs, but the MIDlet must register the connection dynamically.

2. Given the MIDlet code:
2 0. String arg = "telepathy:op=mind.read, target=James.Gosling";
2 1. Connection conn = Connector.open(arg);
Assume telepathy is an unsupported protocol.
Which is true?

A) Compilation fails.
B) An exception is thrown at runtime.
C) The user is presented with an alert.
D) The system quietly ignores the request.

3. Which two are true regarding error handling for classes that exist in both CLDC and J2SE?
(Choose two.)

A) If a class throws an error in CLDC, it should throw the same error as in J2SE or its nearest superclass.
B) The set of error classes is essentially the same in CLDC and J2SE.
C) The set of error classes is much reduced in CLDC to help reduce the overhead of the JVM.
D) There is no correspondence between the errors defined by CLDC and J2SE because the needs of CLDC and J2SE are so different.

4. Given:
1 2. class TestRecordListener implements RecordListener {
1 3. public void recordAdded(RecordStore rcs, int recordId) {
1 4. // ...
2 5. }
2 6. public void recordDeleted(RecordStore rcs, int recordId) {
2 7. // ...
3 3. }
3 4. public void recordChanged(RecordStore rcs, int recordId) {
3 5. // ...
4 3. }
4 4. }
If rs is a valid and open record store, how can you properly associate a record listener with rs?

A) rs.addRecordListener(new TestRecordListener())
B) rs.setRecordListener(new TestRecordListener())
C) rs.newRecordListener(new TestRecordListener())
D) rs.createRecordListener(new TestRecordListener())

5. Given:
a new record store rs, of type javax.microedition.rms.RecordStore containing zero records a method called addNewRecord that adds a record to rs And:
2 1. addNewRecord("Amy");
2 2. addNewRecord("Bill");
2 3. addNewRecord("Candy");
2 4. addNewRecord("Doug");
2 5. rs.deleteRecord(1);
2 6. rs.deleteRecord(3);
2 7. addNewRecord("Ethan");
2 8. addNewRecord("Frank");
2 9. int nextRecNum = rs.getNextRecordID();
What is the value of nextRecNum?

A) 7
B) 5
C) 4
D) 6

Solutions: