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

1. 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.

2. DRAG DROP
Click the Task button.
Place the connection strings on their corresponding connection interfaces.

3. 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.

4. Assume a device supports datagrams and a MIDlet has permission to use datagram connections. Which two are true? (Choose two.)

A) Push registration can fail because the device does NOT support the use of datagrams by the PushRegistry.
B) Push registration can fail if the allowed sender filter specified is *, which poses a security risk to the device.
C) Push registration can fail if there is a push registration conflict, but the user must be prompted as to how to resolve the problem.
D) Push registration can fail if another application has already reserved the connection on the device.

5. A JTWI application sends a text message using the code:
message.setPayloadText("hello world!");
conn.send(message);
What exception will this code throw if a timeout occurs while trying to send the message?

A) java.io.EOFException
B) java.lang.NullPointerException
C) java.lang.SecurityException
D) java.io.InterruptedIOException

Solutions: