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Oracle 1Z0-869 Exam Syllabus Topics:

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

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

2. Which three are defined as user interaction permission modes? (Choose three.)

A) oneshot
B) application
C) session
D) blanket
E) global

3. Given a MIDlet that specifies a push registration in the JAD file as:
MIDlet-Push-1: socket://:79, com.sun.example.SampleChat, *
What is the result when the MIDlet is installed onto a device where another MIDlet has already registered the exact same push connection in the PushRegistry?

A) The MIDlet installs, but the connection CANNOT be used.
B) The MIDlet installs, but the MIDlet must register the connection dynamically.
C) The MIDlet installation is aborted and the user is notified of the problem.
D) The MIDlet installs and overwrites any existing push registrations.
E) The connection can only apply to the currently running MIDlet.

4. Which three statements are true regarding the handling of wireless connections? (Choose three.)

A) Network connections should never be performed on a separate thread, so problems can be handled quickly.
B) Devices can only support one HttpConnection at a time; therefore, network access from multiple threads must be serialized.
C) A network connection could interfere with other services on the device, such as the ability to receive phone calls or SMS on a phone.
D) The connection could unexpectedly terminate while processing the input or output streams.
E) Performing network operations on the same thread used by the display is likely to block refreshes of the display until the network operations complete.

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

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

Solutions: