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

1. Which two are true about JTWI devices using SMS? (Choose two.)

A) Java applications are restricted to using port numbers between 2000 and 9207.
B) A message which is too big to be sent in a single segment is NOT guaranteed to have its segments arrive at the application in the order in which they were sent.
C) The payload for an SMS message segment CANNOT exceed 140 bytes.
D) Multiple messages sent from point A to point B are NOT guaranteed to be delivered in the order in which they were sent.
E) The payload for an SMS message can use the BinaryMessage interface.

2. A JTWI device has a working socket implementation. A MIDlet requests permission to use socket connections on this device using the attribute MIDlet-Permissions-Opt, but is denied permission.
Given:
2 0. public void connect() {
2 1. try {
2 2. String addr = "socket://host.com:79";
2 3. SocketConnection sc;
2 4. sc = (SocketConnection) Connector.open(addr);
2 5. sc.setSocketOption(SocketConnection.LINGER, 5);
2 6. InputStream is = sc.openInputStream();
2 7. OutputStream os = sc.openOutputStream();
2 8. os.write("\\r\\n".getBytes());
2 9. int ch = is.read();
3 0. // ...
3 5. } catch (IOException ioe) {
3 6. // ...
4 0. }
4 1. }
Which is true assuming that the argument to Connector.open() points to a valid destination, and the device has resources to create new socket connections?

A) If connect() executes, a SecurityException is thrown at runtime at line 24.
B) If connect() executes, a SecurityException is thrown at runtime at line 26.
C) If connect() executes, a SecurityException is thrown at runtime at line 28.
D) If connect() executes, a ConnectionNotFoundException is thrown at runtime at line 24.
E) The device disallows the MIDlet to be installed.

3. Which two are true about errors and exceptions in a CLDC-compliant virtual machine?
(Choose two.)

A) Developers are NOT allowed to handle errors.
B) Developers must throw only checked (non-runtime) exceptions.
C) A CLDC-compliant virtual machine must NOT throw a VirtualMachineError.
D) Rather than throwing the Error class specified by the Java Language Specification, the CLDC-compliant virtual machine may throw a CLDC-supported superclass.
E) Developers do NOT receive asynchronous exceptions from a CLDC-compliant virtual machine.

4. What is the result when a user tries to update a signed, installed MIDlet suite with an unsigned MIDlet suite with the same MIDlet-Name?

A) The MIDlet suite with the newer MIDlet-Version is installed.
B) The unsigned MIDlet suite is installed if it has a newer MIDlet-Version.
C) The device blocks all access to any MIDlets.
D) The signed MIDlet suite is left installed, even if the unsigned MIDlet suite has a newer MIDlet-Version.

5. Which two are true? (Choose two.)

A) Synchronous painting to the device display is possible with GameCanvas.
B) GameCanvas always needs a separate thread to draw anything on the screen.
C) Canvas.serviceRepaints() and Canvas.callSerially() can be used to create a constant frame-rate animation loop.
D) paint() is never called for GameCanvas subclasses.

Solutions: