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

1. A Player plays a sound after start() is called. Which is the most efficient way to pause the playback so that it may be started as soon as possible when required?

A) call System.gc() to collect those resources marked for garbage collection
B) call stop() on the player
C) call close() on the player
D) call setRate(0) on the player

2. Which two are true regarding a device that implements JTWI? (Choose two.)

A) The device is NOT required to implement all of the MIDP 2.0 API as identified by the MIDP 2.0 specification.
B) The device must implement at least the lowest version of the API as identified by the JTWI specification.
C) The device may implement a higher version of the API as identified by the JTWI specification.
D) The device must implement the highest version of the API as identified by the JTWI specification.

3. Which three are goals of the CLDC specification? (Choose three.)

A) It does NOT provide device-specific APIs.
B) It allows device manufacturers to build more extensible devices.
C) It allows developers to port existing applications to mobile devices.
D) It is intended to be an application development platform.
E) It is intended as a systems programming environment.

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

5. Assume a particular JTWI phone supports server socket connections. A MIDlet running on the phone attempts to register a connection using:
PushRegistry.registerConnection(connection, midlet, filter); Assume connection, midlet, and filter are NOT null. The statement is executed and throws a ConnectionNotFoundException. What causes the exception?

A) The phone does NOT support push connections using server sockets.
B) The syntax of connection is invalid.
C) The specified MIDlet does NOT exist.
D) The requested connection is already registered.

Solutions: