Free Oracle 1Z0-809 Exam Questions

Become Oracle Certified with updated 1Z0-809 exam questions and correct answers

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Total 469 Questions | Updated On: Nov 12, 2024

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Question 1

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

1. package com.udayan.ocp;

3. class X {

4. class Y {

5. private void m() {

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

7. }

8. }

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. }

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 the code fragment:

What is the result?

A : compilation error occurs at line n2.

B : 3

C : 2

D : compilation error occurs at line n1.

Answer: A

Question 3

Given code of Test.java file:

1. package com.udayan.ocp;

3. import java.util.stream.Stream;

5. public class Test {

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

7. System.out.println(Stream.of(10, 0, -10).sorted().findAny().orElse(-1));

8. }

9. }

Which of the following statements are true about the execution of Test class?

Select 2 options.

A : It will never print -1 on to the console.

B : It can print any number from the stream.

C : It will always print -10 on to the console.

D : It will always print 0 on to the console.

E : It will always print 10 on to the console.

Answer: A,B

Question 4

Given the code fragment:

Stream<Path> files = Files.list(Paths.get(System.getProperty(“user.home”)));

files.forEach (fName -> { //line n1

try {

Path aPath = fName.toAbsolutePath(); //line n2

System.out.println(fName + “:”

+ Files.readAttributes(aPath,

Basic.File.Attributes.class).creationTime

());

} catch (IOException ex) {

ex.printStackTrace();

});

What is the result?

A : All files and directories under the home directory are listed along with their attributes.

B : compilation error occurs at line n1.

C : files and folders in the home directory are listed along with their attributes.

D : A compilation error occurs at line n2.

Answer: C

Question 5

Given code of Test.java file:

1. package com.udayan.ocp;

3. import java.util.ArrayDeque;

4. import java.util.Deque;

6. public class Test {

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

8. Deque deque = new ArrayDeque<>();

9. deque.push(new Boolean("abc"));

10. deque.push(new Boolean("tRuE"));

11. deque.push(new Boolean("FALSE"));

12. deque.push(true);

13. System.out.println(deque.pop() + ":" + deque.peek() + ":" + deque.size());

14. }

15. }

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

A : true:false:3

B : true:true:3

C : false:true:3

D : false:false:3

Answer: A

Page: 1 / 94

Total 469 Questions | Updated On: Nov 12, 2024

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