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

1. Click the Exhibit button. Given:
The MIDlet is executed.
The MIDlet is paused and resumed two times.
What is the result?

A) c: 0
B) c: 2
C) c: 3
D) c: 1
E) An exception is thrown at runtime.

2. Given the MIDlet code:
1 1. DatagramConnection dgc = (DatagramConnection)Connector.open("datagram://:444");
1 2. Datagram datagram = dgc.newDatagram(20);
1 3. dgc.receive(datagram);
1 4. byte[] data = datagram.getData();
1 5. String s = new String(data);
1 6. list.append(s, null);
1 7. System.out.println("Datagram received: " + s);
Which two are true regarding the portability of the code between devices? (Choose two.)

A) Installation will fail on devices that do not support datagrams.
B) Datagrams may not be supported on all platforms.
C) The code is portable because all the classes and interfaces used are defined in the CLDC.
D) Port 444 may be restricted or ignored by some MIDP implementations.

3. Given:
30. public boolean X(byte[] Y) throws IllegalArgumentException {
31. ByteArrayInputStream bais = new ByteArrayInputStream(arg);
32. DataInputStream dis = new DataInputStream(bais);
33. String type = null; 34. 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 matches
Y is type
Z is !type.equals("deleted")
B) X is matches
Y is arg
Z is type.equals("deleted")
C) X is match
Y is type
Z is !type.equals("deleted")
D) X is matches
Y is arg
Z is !type.equals("deleted")
E) X is match
Y is arg
Z is type.equals("deleted")

4. What is the result if a call to serviceRepaints() triggers a separate thread to invoke paint()?

A) A deadlock always occurs.
B) MIDP is thread-safe. There will never be a deadlock.
C) An exception is thrown at runtime.
D) The system may deadlock if the caller to serviceRepaints() holds a lock that is also needed by paint().

5. DRAG DROP
Click the Task button.
Place the correct class within the hierarchy to reflect the class inheritance structure for the MIDP 2.0 user interface API. Not all classes are shown.

Solutions: