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2021 Sep ocjp 1z0-851 dumps:

Q11. A programmer has an algorithm that requires a java.util.List that provides an efficient implementation of add

(0, object), but does NOT need to support quick random access. What supports these requirements?

A. java.util.Queue

B. java.util.ArrayList

C. java.util.LinearList

D. java.util.LinkedList

Answer: D


Q12. Given:

21. abstract class C1 {

22. public C1() { System.out.print(1); }

23. }

24. class C2 extends C1 {

25. public C2() { System.out.print(2); }

26. }

27. class C3 extends C2 {

28. public C3() { System.out.println(3); }

29. }

30. public class Ctest {

31. public static void main(String[] a) { new C3(); }

32. }

What is the result?

A. 3

B. 23

C. 32

D. 123

E. 321

F. Compilation fails.

G. An exception is thrown at runtime.

Answer: D


Q13. Given that t1 is a reference to a live thread, which is true?

A. The Thread.sleep() method can take t1 as an argument.

B. The Object.notify() method can take t1 as an argument.

C. The Thread.yield() method can take t1 as an argument.

D. The Thread.setPriority() method can take t1 as an argument.

E. The Object.notify() method arbitrarily chooses which thread to notify.

Answer: E


Q14. Click the Exhibit button. Given:

25. try {

26. A a = new A();

27. a.method1();

28. } catch (Exception e) {

29. System.out.print("an error occurred");

30. }

Which two statements are true if a NullPointerException is thrown on line 3 of class C? (Choose two.)


A. The application will crash.

B. The code on line 29 will be executed.

C. The code on line 5 of class A will execute.

D. The code on line 5 of class B will execute.

E. The exception will be propagated back to line 27.

Answer: BE


Q15. 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

Answer: C


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Q16. Given:

1. public class Threads2 implements Runnable {

2.

3. public void run() {

4. System.out.println("run.");

5. throw new RuntimeException("Problem");

6. }

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

8. Thread t = new Thread(new Threads2());

9. t.start();

10. System.out.println("End of method.");

11. }

12. }

Which two can be results? (Choose two.)

A. java.lang.RuntimeException: Problem

B. run.

java.lang.RuntimeException: Problem

C. End of method.

java.lang.RuntimeException: Problem

D. End of method.

run.

java.lang.RuntimeException: Problem

E. run.

java.lang.RuntimeException: Problem

End of method.

Answer: DE


Q17. DRAG DROP

Click the Task button.


Answer:


Q18. Given:

10. public class Foo {

11. static int[] a;

12. static { a[0]=2; }

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

14. }

Which exception or error will be thrown when a programmer attempts to run this code?

A. java.lang.StackOverflowError

B. java.lang.IllegalStateException

C. java.lang.ExceptionInInitializerError

D. java.lang.ArrayIndexOutOfBoundsException

Answer: C


Q19. Given:

13. public class Pass {

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

15. int x = 5;

16. Pass p = new Pass();

17. p.doStuff(x);

18. System.out.print(" main x = " + x);

19. }

20.

21. void doStuff(int x) {

22. System.out.print(" doStuff x = " + x++);

23. }

24. }

What is the result?

A. Compilation fails.

B. An exception is thrown at runtime.

C. doStuff x = 6 main x = 6

D. doStuff x = 5 main x = 5

E. doStuff x = 5 main x = 6

F. doStuff x = 6 main x = 5

Answer: D


Q20. Click the Exhibit button. What is the output of the program shown in the exhibit?


A. 300-100-100-100-100

B. 300-300-100-100-100

C. 300-300-300-100-100

D. 300-300-300-300-100

Answer: B