Online 1Z0-809 Practice Test

Question 1

What will be the result of compiling and executing class Test?

1. package com.udayan.ocp;

2.

3. class X {

4. class Y {

5. private void m() {

6. System.out.println("INNER");

7. }

8. }

9.

10. public void invokeInner() {

11. Y obj = new Y(); //Line 9

12. obj.m(); //Line 10

13. }

14. }

15.

16. public class Test {

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

18. new X().invokeInner();

19. }

20. }

Options :

A : Compilation error at Line 9 as instance of outer class (X) is needed to create the instance of inner class (Y)

B : Compilation error at Line 10 as private method m() cannot be invoked outside the body of inner class (Y)

C : INNER

D : Exception is thrown at runtime

Answer: C

Question 2

Given code of Test.java file:

1. package com.udayan.ocp;

2.

3. import java.util.Arrays;

4. import java.util.List;

5. import java.util.ListIterator;

6.

7. public class Test {

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

9. List list = Arrays.asList("T", "S", "R", "I", "F");

10. ListIterator iter = list.listIterator(2);

11. while(iter.hasNext()) {

12. System.out.print(iter.next());

13. }

14. }

15. }

What will be the result of compiling and executing Test class?

Options :

A : IF

B : RIF

C : Runtime Exception

Answer: B

Question 3

Given:

and the code fragment:

Which two code fragments, when inserted at line n1 independently, enable the code to print

TruckCarBike?

Options :

A : .sorted ((v1, v2) -> v1.getVId() < v2.getVId())

B : .sorted (Comparable.comparing (Vehicle: :getVName)).reversed ()

C :

.map (v -> v.getVid())

.sorted ()

D : .sorted((v1, v2) -> Integer.compare(v1.getVId(), v2.getVid()))

E : .sorted(Comparator.comparing ((Vehicle v) -> v.getVId()))

Answer: A,D

Question 4

Given code of Test.java file:

package com.udayan.ocp;

import java.util.concurrent.*;

public class Test {

public static void main(String[] args) throws InterruptedException, ExecutionException {

ExecutorService es = Executors.newSingleThreadExecutor();

Future f = es.submit(() -> "HELLO");

System.out.println(f.get());

es.shutdown();

}

What will be the result of compiling and executing Test class?

Options :

A : An exception is thrown at runtime

B : HELLO

C : Compilation error

D : null

Answer: B

Question 5

Given the code fragments:

class MyThread implements Runnable {

private static AtomicInteger count = new AtomicInteger (0);

public void run () {

int x = count.incrementAndGet();

System.out.print (x+” “);

}

and

Thread thread1 = new Thread(new MyThread());

Thread thread2 = new Thread(new MyThread());

Thread thread3 = new Thread(new MyThread());

Thread [] ta = {thread1, thread2, thread3};

for (int x= 0; x < 3; x++) {

ta[x].start();

}

Which statement is true?

Options :

A : The program prints 1 2 3 and the order is unpredictable

B : The program prints 1 2 3.

C : The program prints 1 1 1

D : A compilation error occurs.

Answer: A

EXPERTY DESIGNED 1Z0-809 PRACTICE TEST