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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. Given:
3 0. public boolean X(byte[] Y) throws IllegalArgumentException {
3 1. ByteArrayInputStream bais = new ByteArrayInputStream(arg);
3 2. DataInputStream dis = new DataInputStream(bais);
3 3. String type = null;
3 4. try {type = dis.readUTF();}
3 5. catch (Exception e) { }
3 6. return(Z);
3 7. }
Which substitutions for X, Y, and Z in the code create a valid implementation of RecordFilter that matches records whose type is NOT deleted?

A) X is match
Y is type
Z is !type.equals("deleted")
B) X is matches
Y is type
Z is !type.equals("deleted")
C) X is matches
Y is arg
Z is type.equals("deleted")
D) X is match
Y is arg
Z is type.equals("deleted")
E) X is matches
Y is arg
Z is !type.equals("deleted")

3. A MIDlet suite running on a GSM phone successfully receives an SMS text message msg from another GSM phone. The suite is using a valid SMS MessageConnection object conn opened in server mode.
The suite tries to respond back using:
msg.setPayloadText("thank you!");
conn.send(msg);
Which is true?

A) The code can succeed because the connection object contains an address for sending a response.
B) The code always fails because the connection object is missing an address for sending a response.
C) The code can succeed because the message object contains an address for sending a response.
D) The code always fails because the message object is missing an address for sending a response.

4. obscure is a content type unsupported on a device that executes: 10. String locator
"http://foobar.sun.com/content.obscure"; 11. Player player
Manager.createPlayer(locator); Which is true?

A) The file is interpreted as an ASCII file.
B) player is set to null.
C) An exception is thrown at runtime.
D) The file is interpreted as an HTML file.

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

Solutions:

Question # 1 Answer: C

Question # 2 Answer: E

Question # 3 Answer: C

Question # 4 Answer: C

Question # 5 Answer: E