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

1. What is guaranteed by the class file verifier?

A) It checks for attempted native library access.
B) It checks for external resource access.
C) It checks for attempted network access.
D) It checks that a given program is a valid Java application.

2. Given:
rs is an object of type javax.microedition.rms.RecordStore.
baos is an object of type java.io.DataOutputStream.
recId is an int.
Which adds a record to rs?

A) byte [] b = baos.write();
try { recId = rs.add(b, 0, b.length); }
catch (Exception e) { }
B) byte [] b = baos.writeByteArray();
try { recId = rs.addRecord(b, 0, b.length); }
catch (Exception e) { }
C) byte [] b = baos.toByteArray();
try { recId = rs.addRecord(b, 0, b.length); }
catch (Exception e) { }
D) byte [] b = baos.write();
try { recId = rs.addRecord(b, 0, b.length); }
catch (Exception e) { }
E) byte [] b = baos.writeByteArray();
try { recId = rs.add(b, 0, b.length); }
catch (Exception e) { }
F) byte [] b = baos.toByteArray();
try { recId = rs.add(b, 0, b.length); }
catch (Exception e) { }

3. Assuming an application descriptor contains: MIDlet-Data-Size: 4096 Which is true?

A) The device will permanently reserve 4096 bytes of RMS space for the application.
B) The device will permanently reserve 4096 bytes of heap space for the application.
C) The device will use 4096 bytes to buffer data the application receives over the network.
D) The device will use 4096 bytes to buffer data the application sends over the network.

4. 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 is triggered but there are no guarantees that any memory has been reclaimed.
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 CANNOT reclaim the memory allocated to foo because the reference is nulled out.

5. Which two events can result in the removal of a MIDlet's dynamic push connection registration? (Choose two.)

A) Using a call to PushRegistry.unregisterConnection().
B) Using a call to PushRegistry.removeConnection().
C) Using a call to PushRegistry.registerConnection().
D) Opening the connection using Connector.open().
E) When MIDlet.destroyApp() is called.
F) When the MIDlet is uninstalled.

Solutions: