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

1. A mobile application developer is trying to reduce the memory footprint of a game using the MIDP Game API? Which is a valid approach?

A) reuse a single GameCanvas throughout the application
B) restrict the number of frames per Sprite to one
C) use a single bitmap background rather than multiple tiles
D) implement keyPressed() and keyReleased()

2. Which two are true regarding error handling for classes that exist in both CLDC and J2SE?
(Choose two.)

A) The set of error classes is essentially the same in CLDC and J2SE.
B) If a class throws an error in CLDC, it should throw the same error as in J2SE or its nearest superclass.
C) The set of error classes is much reduced in CLDC to help reduce the overhead of the JVM.
D) There is no correspondence between the errors defined by CLDC and J2SE because the needs of CLDC and J2SE are so different.

3. Which statement is true about TiledLayer and Sprite objects maintained by a LayerManager object?

A) Either Sprite or TiledLayer objects may be inserted at a unique position in the LayerManager.
B) TiledLayer objects are always added as the background layer.
C) Once either Sprite or TiledLayer objects are added, the order can be changed only by creating and adding to a new LayerManager.
D) Sprite objects are always added as the background layer.

4. Given:
MIDlet-Push-1: datagram://:444, com.fooworks.PushExample, *
MIDlet-Push-2: datagram://:555, com.fooworks.PushExample, *
are statically registered push connections and given:
1 1. protected void startApp() {
1 2. String[] connections = PushRegistry.listConnections(true);
1 3. if(connections.length == 0) {
1 4. connections = PushRegistry.listConnections(false);
1 5. for (int i=0; i < connections.length; i++) {
1 6. new DatagramHandler(connections[i]).start();
1 7. }
1 8. } else {
1 9. for (int i=0; i < connections.length; i++) {
2 0. new DatagramHandler(connections[i]).start();
2 1. }
2 2. }
2 3. }
Which two identify what will go wrong if the code is invoked by the Application Management Software in response to an inbound connection notification? (Choose two.)

A) Duplicate DatagramHandler objects are created if the MIDlet is paused and then resumed.
B) The first inbound datagram is handled, but all other datagrams are missed.
C) An IOException is thrown if there are no active connections.
D) The first inbound datagram is ignored, all subsequent datagrams are handled by DatagramHandler.
E) Datagrams for the active connection are handled, but any datagrams sent to the other port are missed.

5. Given:
2 1. TextField tf = new TextField("Memo", "", 50, TextField.ANY);
2 2. DateField df = new DateField("Date", DateField.DATE_TIME);
2 3. Form fm = new Form("Form demo");
2 4. Command cmCount = new Command("Word count", Command.ITEM, 1);
2 5. Command cmExit = new Command("Exit", Command.EXIT, 1);
2 6.
2 7. tf.addCommand(cmCount);
2 8. fm.append(df);
2 9. fm.append(tf);
3 0. fm.addCommand(cmExit);
3 1. fm.setCommandListener(this);
Which is true?

A) The cmExit command is available only when df is the active Item.
B) The cmCount command is available only when tf is the active Item.
C) The cmCount and cmExit commands is always available on fm, regardless of which Item is active.
D) An exception is thrown at runtime.
E) Compilation fails.

Solutions: