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

1. Given:
1 0. //...
2 0. int[] foo = new int[10000];
2 1. foo = null;
2 2. System.gc();
2 3. //...
Which is true once the program execution reaches line 23?

A) The garbage collector is triggered but there are no guarantees that any memory has been reclaimed.
B) The garbage collector CANNOT reclaim the memory allocated to foo because the reference is nulled out.
C) The garbage collector suspends the program until more memory becomes available.
D) The garbage collector is triggered and memory is guaranteed to be reclaimed.

2. Given the MIDlet code:
7 . public void exitApp() {
8 . Runtime rt = Runtime.getRuntime();
9 . rt.exit(0);
1 0. }
What is the result of a call to exitApp()?

A) Compilation fails because of an error on line 9.
B) exitApp() completes execution successfully.
C) A SecurityException is thrown at line 9.
D) Compilation fails because of an error on line 8.

3. Which is false about untrusted MIDlet suites?

A) Untrusted MIDlet suites may access protected APIs or functions if given explicit user permission.
B) An untrusted MIDlet suite does not request permissions explicitly in the JAR manifest or the application descriptor.
C) JTWI devices must treat all MIDP 1.0 suites as untrusted.
D) JTWI devices must treat all MIDP 2.0 suites as trusted.

4. What are the rules for the look and feel of the user interface components?

A) The user interface always looks exactly as it does in the MIDP Reference Implementation.
B) The user interface look and feel may be drastically different on different devices.
C) The dimensions of all the user components are always the same on any device, even if they look different.
D) The user interface is always in monochrome, so the developer should NOT use color.

5. Given that rs is an object of type javax.microedition.rms.RecordStore and that record 1 exists in rs, and
2 1. String one = "short String";
2 2. String two = "a much longer String";
2 3. byte [] small = one.getBytes();
2 4. byte [] big = two.getBytes();
2 5. rs.setRecord(1, big, 0, big.length);
2 6. rs.setRecord(1, small, 0, small.length);
What is the result?

A) Record 1 contains "short Stringr String."
B) Record 1 contains "a much longer String."
C) Compilation fails.
D) An exception is thrown at runtime.
E) Record 1 contains "short String."

Solutions: