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

1. Which three APIs may untrusted MIDlets use without explicit confirmation by the user?
(Choose three.)

A) javax.microedition.rms
B) javax.microedition.media
C) javax.microedition.lcdui
D) javax.microedition.io.HttpConnection
E) javax.microedition.io.PushRegistry

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

3. Due to possible performance consequences, the MIDP 2.0 specification urges caution when creating certain types of record store enumerations. Which is identified in the specification as having the greatest probability of resulting in poor response time?

A) using a filter
B) using a comparator
C) using a filter and a comparator together
D) setting the keepUpdated argument to true

4. Click the Exhibit button.
Given the GameCanvas code:
1 0. public void run() {
1 1. try {
1 2. Graphics g = getGraphics();
1 3. Image dog = Image.createImage("/dog.png");
1 4. Sprite s = new Sprite(dog, 98, 88);
1 5. s.setPosition(0,0);
1 6. while (gameActive) {
1 7. s.setFrame(0);
1 8. s.paint(g);
1 9. flushGraphics();
2 0. s.setFrame(1);
2 1. s.paint(g);
2 2. flushGraphics();
2 3. }
2 4. } catch (Exception ex) {
2 5. //...
3 1. }
3 2. }
Assuming that gameActive is true, and that run() is called as a result of a new thread's start() invocation, what is the result?

A) An exception is thrown at runtime because of an error with the arguments to the Sprite constructor.
B) An IndexOutOfBoundsException occurs due to an error in line 17 or line 20.
C) The dog on the left side of the image file appears on the display, but the dog on the right side is never seen.
D) Compilation fails because Sprite does NOT have a paint(Graphics g) method.
E) An animation appears that continuously cycles between the two versions of the dog.

5. obscure is a content type unsupported on a device that executes:
1 0. String locator = "http://foobar.sun.com/content.obscure";
1 1. Player player = Manager.createPlayer(locator);
Which is true?

A) The file is interpreted as an ASCII file.
B) player is set to null.
C) An exception is thrown at runtime.
D) The file is interpreted as an HTML file.

Solutions: