Online Access Free 1Z0-804 Practice Test

Which type of ExecutorService supports the execution of tasks after a fixed delay?

• A.FixedExecutorService
• B.ScheduledExecutorService
• C.FutureExecutorService
• D.TimedExecutorService
• E.DelayedExecutorService

Which three are true?

• A.After calling rollback (mysavepoint), you must close the savepoint object by calling mySavepoint.close() .
• B.A rollback () method invocation releases any database locks currently held by this connection object.
• C.An instance of Savepoint represents a point in the current transaction context.
• D.A setAutoCommit (False) method invocation starts a transaction context.
• E.A rollback () method invocation rolls a transaction back to the last savepoint.

Given:

From what threading problem does the program suffer?

• A.starvation
• B.livelock
• C.race condition
• D.deadlock

Given the code fragment: Which two try statements, when inserted at line ***, enable the code to successfully move the file info.txt to the destination directory, even if a file by the same name already exists in the destination directory?

• A.try (FileChannel in = new FileInputStream (source). getChannel(); FileChannel out = new FileOutputStream
  (dest).getChannel()) { in.transferTo(0, in.size(), out);
• B.try (Files.move(Paths.get(source),Paths.get(dest));
• C.try ( Files.copy(Paths.get(source),Paths.get(dest)); Files.delete (Paths.get(source));
• D.try ( Files.copy(Paths.get(source), Paths.get(dest),StandardCopyOption.REPLACE_EXISTING); Files.delete
  (Paths.get(source));
• E.try(BufferedReader br = Files.newBufferedReader(Paths.get(source), Charset.forName("UTF
  8"));
  BufferedWriter bw = Files.newBufferedWriter(Paths.get(dest), Charset.forName("UTF-8")); String
  record =
  "";
  while ((record = br.readLine()) ! = null) {
  bw.write(record);
  bw.newLine();
  } Files.delete(Paths.get(source));

Which statement creates a low overhead, low-contention random number generator that is isolated to thread to generate a random number between 1 and 100?

• A.int i = ThreadSafeRandom.current().nextInt(1, 101);
• B.int i = ThreadLocalRandom.current().nextInt(1, 101);
• C.int i = new random().nextInt(100)+1;
• D.int i = (int) Math.random()*100+1;
• E.int i = (int) Math.random(1, 101);