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: Jan 06, 2026

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Question 1

Given the code fragment:

public class FileThread implements Runnable {

String fName;

public FileThread(String fName) { this.fName = fName; }

public void run () System.out.println(fName);}

public static void main (String[] args) throws IOException,

InterruptedException {

ExecutorService executor = Executors.newCachedThreadPool();

Stream<Path> listOfFiles = Files.walk(Paths.get(“Java Projects”));

listOfFiles.forEach(line -> {

executor.execute(new FileThread(line.getFileName().toString()));

line n1

});

executor.shutdown();

executor.awaitTermination(5, TimeUnit.DAYS); //

line n2

}

The Java Projects directory exists and contains a list of files.

What is the result?

A : The program throws a runtime exception at line n2.

B : The program prints files names concurrently

C : The program prints files names sequentially.

D : A compilation error occurs at line n1

Answer: B

Question 2

Given code of Test.java file:

1. package com.udayan.ocp;

3. import java.time.*;

5. public class Test {

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

7. System.out.println(Duration.ofDays(-2));

8. }

9. }

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

A : PT48H

B : P-2D

C : P2D

D : PT-48H

Answer: D

Question 3

Given the code fragment:

Stream<Path> files = Files.walk(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 : A compilation error occurs at line n1.

C : The files in the home directory are listed along with their attributes

D : A compilation error occurs at line n2.

Answer: A

Question 4

The last statement inside main(String []) method, increments value of i, which means it is not effectively final and hence compilation error.

//Test.java

package com.udayan.ocp;

class Player {

String name;

int age;

Player() {

this.name = "Virat";

this.age = 29;

}

public int hashCode() {

return 100;

}

public class Test {

public static void main(String[] args) {

System.out.println(new Player());

}

Hexadecimal representation of 100 is 64.

Which of the following option is correct?

A : Code compiles successfully but throws an exception on executing it

B : Code compiles successfully and on execution always prints "com.udayan.ocp.Player@64" on to the console

C : Code doesn't compile successfully

D : None of the other options

Answer: B

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: Jan 06, 2026

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