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

1. There are different variants of opening a socket connection with the Generic Connection Framework. Which three are valid? (Choose three.)

A) Connection conn = Connector.open("socket::java.sun.com");
B) Connection conn = Connector.open("socket://");
C) Connection conn = Connector.open("socket:80://java.sun.com");
D) Connection conn = Connector.open("socket://java.sun.com:80");
E) Connection conn = Connector.open("socket://java.sun.com");
F) Connection conn = Connector.open("socket");

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

3. Given:
a JAR containing a MIDlet named TesterMIDlet
a JAD with this content:
CertificationExam: Sun Certified Mobile Application DeveloperMIDlet-1: TesterMIDlet, , certification.TesterMIDlet MIDlet-Jar-Size: 2038 MIDlet-Jar-URL: Certification.jar MIDlet-Name: Certification MIDlet-Vendor: A Testing Company MIDlet-Version: 1.0 MicroEdition-Configuration: CLDC-1.0
MicroEdition-Profile: MIDP-2.0
This MIDlet needs to get the property with the key CertificationExam defined in the JAD.
This needs to be assigned to a String ExamName from within the MIDlet.startApp() method.
What is the correct way to accomplish this?

A) String ExamName = this.getAppProperty("CertificationExam");
B) String ExamName = this.getAppProperty("MIDlet-CertificationExam");
C) String ExamName = System.getProperty("CertificationExam");
D) String ExamName = System.getProperty("MIDlet-CertificationExam");

4. Which three statements are true regarding the handling of wireless connections? (Choose three.)

A) Devices can only support one HttpConnection at a time; therefore, network access from multiple threads must be serialized.
B) Performing network operations on the same thread used by the display is likely to block refreshes of the display until the network operations complete.
C) Network connections should never be performed on a separate thread, so problems can be handled quickly.
D) A network connection could interfere with other services on the device, such as the ability to receive phone calls or SMS on a phone.
E) The connection could unexpectedly terminate while processing the input or output streams.

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

Solutions: