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

1. A mobile application developer is trying to increase the performance of a game using the MIDP Game API. Which two are legal, valid approaches that fulfill the developer's goal?
(Choose two.)

A) implement keyPressed(), keyReleased(), and keyRepeated()
B) restrict the number of frames per Sprite to one
C) always ensure that the view window is larger than the visible screen
D) poll for key states only when necessary
E) base collision detection on rectangle boundaries

2. A MIDlet needs to receive incoming socket push notifications. It requests only the permissions:
javax.microedition.io.PushRegistry javax.microedition.io.Connector.socket javax.microedition.io.Connector.serversocket Which is true?

A) The MIDlet CANNOT receive incoming socket push notifications without the permission javax.microedition.io.Connector.socketreceiver.
B) When an incoming socket connection activates the MIDlet, the MIDlet can always retrieve that connection while starting up.
C) When an incoming socket connection activates the MIDlet, the MIDlet may be unable to retrieve that connection while starting up.
D) When an incoming socket connection activates the MIDlet, the MIDlet will always be unable to retrieve that connection while starting up.

3. A mobile application developer wants to reduce memory use and improve the speed of a game using the MIDP 2.0 Game API. Which three are valid, legal ways to help fulfill the developer's goal? (Choose three.)

A) while(gameActive) {
int keyStates = getKeyStates();
if ((keyStates & LEFT_PRESSED) != 0) {
// code to move a Sprite
}
B) mySprite.collidesWith(otherSprite, false);
//pixel level false
C) keyPressed(int keyCode) {
// code to process the key press event
}
D) layerManager.setViewWindow(0,0, getWidth() + 50, getHeight() + 50);
E) GameCanvas game = new GameCanvas(true);
//suppress key events

4. Which is true regarding the use of Thread objects in a CLDC 1.1 compliant virtual machine?

A) A Thread can be stopped only from the inside of a MIDlet class.
B) A Thread lives until it exits from the run() method it invoked at startup.
C) To stop a Thread, a developer can use the stop() method.
D) There is no way for one Thread to force another Thread to stop.

5. Which two are provided through a WMA 1.1 Message interface? (Choose two.)

A) data
B) timestamp
C) address
D) header

Solutions: