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Oracle 1Z0-869 Exam Syllabus Topics:

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

1. Which two can a developer use to create a Timer that will go off in 5 seconds, repeating every 3 seconds? (Choose two.)

A) timer.scheduleAtFixedRate(timerTask, 5000, 3000);
B) timer.scheduleAtFixedRate(timerTask, 5, 3);
C) timer.schedule(timerTask, 5000, 3000);
D) timer.schedule(timerTask, new Date().getTime() + 5000, 3000);
E) timer.schedule(timerTask, 5, 3);

2. 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 SecurityException is thrown at runtime at line 28.
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 24.
E) If connect() executes, a ConnectionNotFoundException is thrown at runtime at line 24.

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

4. A MIDlet suite on a device uses socket connections. The device always asks the user for permission when the suite tries opening a socket connection. What is always false about the MIDlet suite?

A) It is trusted and requests permission to use sockets with MIDlet-Permissions-User.
B) It is trusted and requests permission to use sockets with MIDlet-Permissions-Opt.
C) It is untrusted.
D) It is trusted and requests permission to use sockets with MIDlet-Permissions.

5. Given:
rs is an object of type javax.microedition.rms.RecordStore.
baos is an object of type java.io.DataOutputStream.
recId is an int.
Which adds a record to rs?

A) byte [] b = baos.writeByteArray();
try { recId = rs.add(b, 0, b.length); }
catch (Exception e) { }
B) byte [] b = baos.write();
try { recId = rs.add(b, 0, b.length); }
catch (Exception e) { }
C) byte [] b = baos.write();
try { recId = rs.addRecord(b, 0, b.length); }
catch (Exception e) { }
D) byte [] b = baos.toByteArray();
try { recId = rs.addRecord(b, 0, b.length); }
catch (Exception e) { }
E) byte [] b = baos.writeByteArray();
try { recId = rs.addRecord(b, 0, b.length); }
catch (Exception e) { }
F) byte [] b = baos.toByteArray();
try { recId = rs.add(b, 0, b.length); }
catch (Exception e) { }

Solutions: