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

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

2. Which three dimensions of a standard-size application does the JTWI 1.0 specification define? (Choose three.)

A) JAD size
B) RMS data size
C) JAR size
D) screen size
E) heap size

3. Manager.createPlayer(..) may involve synchronous blocking I/O operations, possibly blocking execution for an indefinite amount of time. Which is the most efficient way to create a Player object and receive the events it generates?

A) Create the Player in a separate thread from the user interface, then create a PlayerListener that receives events from this Player.
B) Create the Player from an InputStream, possibly after copying data into memory.
C) Ensure System.gc() is called before creating the Player.
D) Create the Player in the current thread and listen for events in a separate thread.

4. What is the minimum number of simultaneously running threads that a JTWI 1.0 device must support for each MIDlet suite?

A) 10
B) 3
C) two running threads for each class of the MIDlet suite
D) 1

5. Click the Exhibit button.
What is the result?

A) myForm contains the string "run count: 0".
B) myForm contains the string "run count: 2".
C) myForm contains the string "waiting...".
D) myForm contains the string "run count: 1".
E) An exception is thrown at runtime.

Solutions: