Oracle 1Z0-851 Online Practice Questions and Exam Preparation

Oracle 1Z0-851 Online Questions & Answers

• Question 241:

  Click the Exhibit button. Which statement is true about the classes and interfaces in the exhibit?

  

  A. Compilation will succeed for all classes and interfaces.
  B. Compilation of class C will fail because of an error in line 2.
  C. Compilation of class C will fail because of an error in line 6.
  D. Compilation of class AImpl will fail because of an error in line 2.
  C. Compilation of class C will fail because of an error in line 6.

• Question 242:

  Given:

  12.

  String csv = "Sue,5,true,3";

  13.

  Scanner scanner = new Scanner( csv );

  14.

  scanner.useDelimiter(",");

  15.

  int age = scanner.nextInt();

  What is the result?

  A. Compilation fails.
  B. After line 15, the value of age is 5.
  C. After line 15, the value of age is 3.
  D. An exception is thrown at runtime.
  D. An exception is thrown at runtime.

• Question 243:

  Given:

  11. public void genNumbers() {

  12. ArrayList numbers = new ArrayList();

  13. for (int i=0; i<10; i++) {

  14. int value = i * ((int) Math.random());

  15. Integer intObj = new Integer(value);

  16. numbers.add(intObj);

  17. }

  18. System.out.println(numbers);

  19. }

  Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbage collection?

  A. Line 16
  B. Line 17
  C. Line 18
  D. Line 19
  E. The object is NOT a candidate for garbage collection.
  D. Line 19

• Question 244:

  Given:

  11.

  public enum Title {

  12.

  MR("Mr."), MRS("Mrs."), MS("Ms.");

  13.

  private final String title;

  14.

  private Title(String t) { title = t; }

  15.

  public String format(String last, String first) {

  16.

  return title + " " + first + " " + last;

  17.

  }

  18.

  }

  19.

  public static void main(String[] args) {

  20.

  System.out.println(Title.MR.format("Doe", "John"));

  21.

  }

  What is the result?

  A. Mr. John Doe
  B. An exception is thrown at runtime.
  C. Compilation fails because of an error in line 12.
  D. Compilation fails because of an error in line 15.
  E. Compilation fails because of an error in line 20.
  A. Mr. John Doe

• Question 245:

  DRAG DROP

  Select and Place:

  

  

• Question 246:

  Given:

  1. public class Threads3 implements Runnable {

  2. public void run() {

  3. System.out.print("running");

  4. }

  5. public static void main(String[] args) {

  6. Thread t = new Thread(new Threads3());

  7. t.run();

  8. t.run();

  9. t.start();

  10. }

  11. }

  What is the result?

  A. Compilation fails.
  B. An exception is thrown at runtime.
  C. The code executes and prints "running".
  D. The code executes and prints "runningrunning".
  E. The code executes and prints "runningrunningrunning".
  E. The code executes and prints "runningrunningrunning".

• Question 247:

  Given:

  11.

  public static void main(String[] args) {

  12.

  try {

  13.

  args = null;

  14.

  args[0] = "test";

  15.

  System.out.println(args[0]);

  16.

  } catch (Exception ex) {

  17.

  System.out.println("Exception");

  18.

  } catch (NullPointerException npe) {

  19.

  System.out.println("NullPointerException");

  20.

  }

  21.

  }

  What is the result?

  A. test
  B. Exception
  C. Compilation fails.
  D. NullPointerException
  C. Compilation fails.

• Question 248:

  Given:

  11.

  public static void main(String[] args) {

  12.

  Object obj = new int[] { 1, 2, 3 };

  13.

  int[] someArray = (int[])obj;

  14.

  for (int i : someArray) System.out.print(i + " ");

  15.

  }

  What is the result?

  A. 1 2 3
  B. Compilation fails because of an error in line 12.
  C. Compilation fails because of an error in line 13.
  D. Compilation fails because of an error in line 14.
  E. A ClassCastException is thrown at runtime.
  A. 1 2 3

• Question 249:

  Click the Exhibit button. What is the result?

  

  A. Value is: 8
  B. Compilation fails.
  C. Value is: 12
  D. Value is: -12
  E. The code runs with no output.
  F. An exception is thrown at runtime.
  A. Value is: 8

• Question 250:

  DRAG DROP

  Select and Place: