1Z1-805 무료 덤프문제 온라인 액세스

Given:
public class MyGrades {
private final List<Integer> myGrades = new ArrayList<Integer>();
private final ReadWriteLock rwlock = new ReentrantReadWriteLock();
public void addGrade(Integer grade) {
/*
lock and modify
*/
}
public void averageGrades() {
// acquire _______ lock Line **
double sum = 0;
int i = 0;
for (i = 0; i < myGrades.size(); i++) {
sum += myGrades.get(i);
}
// release __________ lock Line ***
System.out.println("The average is: " + sum/(i+1));
}
}
Which pair's statements should you insert at line ** and line *** (respectively) to acquire and release the most appropriate lock?

• A.rwlock.readLock().lock(); rwlock.readLock().unlock();
• B.rwlock.readLock().acquire(); rwlock.readLock().release();
• C.rwlock.getLock().acquire();
  rwlock.getLock().release();
• D.rwlock.getLock().lock(); rwlock.getLock().Unlock();
• E.rwlock.writeLock().lock(); rwlock.WriteLock().unlock();
• F.rwlock.WriteLock().acquire(); rwlock.writeLock().release();

Which two fragments can be combined into a statement that returns an ExecuteService instance?

• A.ExecutorService
• B..getSingleThreadExecutor ();
• C..createSingleThreadExecutor ();
• D..buildSingleThreadExecutor ();
• E..newSingleThreadExecutor ();
• F.Executors
• G.Executor

The default file system includes a logFiles directory that contains the following files:
log - Jan2009
log_01_2010
log_Feb2010
log_Feb2011
log-sum-2012
How many files the matcher in this fragment match?
PathMatcher matcher = FileSystems.getDefault ().getPathMatcher ("glob:???_*1");

• A.Six
• B.Three
• C.Five
• D.Two
• E.Four
• F.One

In the Java SE7 API, which method is most commonly used by factories to instantiate objects?

• A.new ()
• B.getInstance ()
• C.create ()
• D.make ()
• E.getObject ()
• F.createObject ()

Which three enum constants are defined in FilevisitResult?

• A.NOFOLLOW_LINKS
• B.DELETE_CHILD
• C.FOLLOW_LINKS
• D.TERMINATE
• E.CONTINUE
• F.SKIP_SIBLINGS