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

1. Given:
12. canvas.repaint(x1,y1,wd,ht);
13. canvas.repaint(x2,y2,wd,ht);
14. canvas.serviceRepaints();
Which two are true? (Choose two.)

A) If the two regions specified in repaint() overlap, repaint() may attempt to paint the union of the two areas.
B) paint() is called three times, once for each repaint() and once for serviceRepaints().
C) serviceRepaints() blocks waiting for paint() to return.
D) paint() is always called twice, once for each repaint() request.

2. Given the MIDlet code:
1 1. public void startApp() {
1 2. Form f = new Form("hello");
1 3. Display.getDisplay(this).setCurrent(f);
1 4. System.gc();
1 5. System.exit(0);
1 6. f.append("foo");
1 7. }
What is the result?

A) The application runs, and foo prints to the current display.
B) The application runs, but throws an exception at runtime.
C) Compilation fails.
D) The application runs, but line 15 is ignored.
E) The application runs without exception, but foo is not printed.

3. Which two are true about record stores? (Choose two.)

A) MIDlet suites that contain shared record stores are identified by using attributes from that suite's JAR file.
B) A MIDlet CANNOT access a given record store using multiple simultaneous threads.
C) If two MIDlet suites each have a record store with the same name, then those suites CANNOT share those identically named record stores.
D) The API does NOT provide locking operations for record stores.
E) Record store names are case sensitive.

4. Which three are top level interfaces in the javax.wireless.messaging package? (Choose three.)

A) MessageConnection
B) Message
C) MessageHandler
D) Datagram
E) MessageListener
F) Connector

5. Given the MIDlet code:
3 . public void go() {
4 . try {
5 . doStuff();
6 . } catch(java.lang.IllegalAccessError e) {
7 . aForm.append("An Error");
8 . }
9 . }
Assuming the aForm variable on line 7 is a correctly initialized Form and set to the current display, what is the result?

A) The MIDlet fails at runtime due to a problem on line 6.
B) The MIDlet fails at runtime due to a problem on line 7.
C) An Error is printed to the display if an IllegalAccessError occurs.
D) Compilation fails due to a problem on line 7.
E) Compilation fails due to a problem on line 6.

Solutions: