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:

and the code fragment:

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

TruckCarBike?

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 2

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?

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

Question 3

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 4

Consider the code of Greet.java file:

1. package com.udayan.ocp;

3. public final class Greet {

4. private String msg;

5. public Greet(String msg) {

6. this.msg = msg;

7. }

9. public String getMsg() {

10. return msg;

11. }

12.

13. public void setMsg(String msg) {

14. this.msg = msg;

15. }

16. }

Is Greet class an immutable class?

A : Yes

B : No

Answer: B

Question 5

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

Page: 1 / 94

Total 469 Questions | Updated On: Jan 06, 2026

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