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Oracle Java Mobile Edition 1 Mobile Application Developer Certified Professional Sample Questions:
1. Manager.createPlayer(..) may involve synchronous blocking I/O operations, possibly blocking execution for an indefinite amount of time. Which is the most efficient way to create a Player object and receive the events it generates?
A) Create the Player from an InputStream, possibly after copying data into memory.
B) Create the Player in the current thread and listen for events in a separate thread.
C) Create the Player in a separate thread from the user interface, then create a PlayerListener that receives events from this Player.
D) Ensure System.gc() is called before creating the Player.
2. Which is true regarding the javax.wireless.messaging package?
A) Message objects are assumed always to be blocks of binary data.
B) This API is designed to run exclusively on the GSM SMS protocol.
C) The messaging protocols that use this API are typically store-and-forward.
D) Messages are usually lost if the recipient is not connected at the time of sending.
3. Given the MIDlet code:
1 1. try {
1 2.Class socketClass = Class.forName("java.net.Socket");
1 3.Object socket = socketClass.newInstance();
1 4. } catch (ClassNotFoundException x) {
1 5. } catch (InstantiationException y) {
1 6. } catch (IllegalAccessException z) {
1 7. }
Which is true?
A) It will not compile. ClassNotFoundException and IllegalAccessException are not supported by CLDC.
B) It will compile, but results in an InstantiationException.
C) It will not compile. Class.forName() is not supported by CLDC.
D) It will compile, but results in a ClassNotFoundException.
4. Which two are true regarding a device that implements JTWI? (Choose two.)
A) The device must implement the highest version of the API as identified by the JTWI specification.
B) The device must implement at least the lowest version of the API as identified by the JTWI specification.
C) The device is NOT required to implement all of the MIDP 2.0 API as identified by the MIDP 2.0 specification.
D) The device may implement a higher version of the API as identified by the JTWI specification.
5. Given that rs is an object of type javax.microedition.rms.RecordStore and that record 1 exists in rs, and
2 1. String one = "short String";
2 2. String two = "a much longer String";
2 3. byte [] small = one.getBytes();
2 4. byte [] big = two.getBytes();
2 5. rs.setRecord(1, big, 0, big.length);
2 6. rs.setRecord(1, small, 0, small.length);
What is the result?
A) Compilation fails.
B) An exception is thrown at runtime.
C) Record 1 contains "a much longer String."
D) Record 1 contains "short String."
E) Record 1 contains "short Stringr String."
Solutions:
Question # 1 Answer: C | Question # 2 Answer: C | Question # 3 Answer: D | Question # 4 Answer: B,D | Question # 5 Answer: D |