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

1. Given:
1 0. //...
2 0. try {
2 1. Hashtable table = new Hashtable();
2 2. for (;;) table.put(new Object(), new Object());
2 3. } catch (OutOfMemoryException e) {
2 4. Display.getDisplay().setCurrent(new Alert("Out of Memory!"));
2 5. }
2 6. //...
Which is true?

A) An exception is thrown at runtime but there is no guarantee an alert will be shown to the user.
B) Compilation fails.
C) Out of Memory! is printed to the system console.
D) The program hangs at line 22.

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

3. DRAG DROP
Click the Task button. Place each player state next to its description.

4. Assuming an application descriptor contains:
MIDlet-Data-Size: 4096
Which is true?

A) The device will permanently reserve 4096 bytes of RMS space for the application.
B) The device will use 4096 bytes to buffer data the application receives over the network.
C) The device will permanently reserve 4096 bytes of heap space for the application.
D) The device will use 4096 bytes to buffer data the application sends over the network.

5. A MIDlet makes its only attempt to register a push connection on a JTWI device using:
PushRegistry.registerConnection(
"datagram://:79", midlet, "10.0.0.???");
Which is true?

A) The MIDlet accepts datagram push connections on port 79 only from IP addresses in the range 10.0.0.100 to 10.0.0.255 and on any other port from IP addresses other than those in the range 10.0.0.100 to 10.0.0.255.
B) The call to registerConnection() causes an exception, because the
string 10.0.0.??? is an illegal argument.
C) The MIDlet accepts datagram push connections on port 79 only from IP addresses in the range 10.0.0.0 to 10.0.0.255.
D) The MIDlet accepts datagram push connections on port 79 only from IP addresses in the range 10.0.0.100 to 10.0.0.255.

Solutions: