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

1. Which is true regarding the javax.wireless.messaging package?

A) This API is designed to run exclusively on the GSM SMS protocol.
B) The messaging protocols that use this API are typically store-and-forward.
C) Message objects are assumed always to be blocks of binary data.
D) Messages are usually lost if the recipient is not connected at the time of sending.

2. Which two methods are available in both the low-level and high-level APIs? (Choose two.)

A) getLayout()
B) isShown()
C) setFullScreenMode()
D) getTitle()

3. 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.
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 10.0.0.100 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.
D) 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.

4. Given the MIDlet code:
1 0. //...
2 0. try {
2 1. Connection conn = Connector.open("http://www.sun.com");
2 2. InputStream is = conn.getInputStream();
2 3. //...
3 0. } catch (IOException e) {
3 1. //...
4 0. }
Which is true?

A) An exception is thrown at runtime.
B) The system returns a null InputStream.
C) Compilation fails.
D) The system returns a valid InputStream for reading.

5. Given:
1 . import javax.microedition.midlet.*;
2 . public class Foo extends MIDlet {
3 . public void go() {
4 . ThreadGroup x = Thread.currentThread().getThreadGroup();
5 . int numThreads = x.activeCount();
6 . Thread[] threads = null;
7 . x.enumerate(threads);
8 . }
9 . public void destroyApp(boolean b) { }
1 0. public void pauseApp() { }
1 1. public void startApp() { }
1 2. }
What is the result?

A) Compilation succeeds, but the program produces a runtime exception or error.
B) Compilation fails because of an error on line 7.
C) Compilation fails because of an error on a line other than 4 or 7.
D) Compilation succeeds and the program runs without errors.
E) Compilation fails because of an error on line 4.

Solutions: