Free Oracle 1Z0-809 Exam Questions

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

Page: 1 / 94

Total 469 Questions | Updated On: Apr 03, 2026

Add To Cart

Question 1

Given:

public class Counter {

public static void main (String[ ] args) {

int a = 10;

int b = -1;

assert (b >=1) : “Invalid Denominator”;

int с = a / b;

System.out.println (c);

}

What is the result of running the code with the –da option?

A : -10

B : 0

C : An AssertionError is thrown.

D : A compilation error occurs.

Answer: A

Question 2

Given code of Test.java file:

1. package com.udayan.ocp;

3. import java.util.Arrays;

4. import java.util.Comparator;

5. import java.util.List;

7. public class Test {

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

9. List list = Arrays.asList(10, 20, 8);

10.

11. System.out.println(list.stream().max(Comparator.comparing(a -> a)).get()); //Line 1

12.

13. System.out.println(list.stream().max(Integer::compareTo).get()); //Line 2

14.

15. System.out.println(list.stream().max(Integer::max).get()); //Line 3

16. }

17. }

Which of the following statement is true?

A : Line 1 and Line 3 print same output

B : Line 2 and Line 3 print same output

C : Line 1 and Line 2 print same output

D : Line 1, Line 2 and Line 3 print same output

Answer: C

Question 3

Given:

From what threading problem does the program suffer?

A : race condition

B : deadlock

C : starvation

D : livelock

Answer: B

Question 4

Given the code fragment:

Assume that:

The required database driver is configured in the classpath.

The appropriate database is accessible with the dbURL, userName, and passWord exists

The Employee table has a column ID of type integer and the SQL query matches one record.

What is the result?

A : Compilation fails at line 14.

B : Compilation fails at line 15.

C : The code prints the employee ID.

D : The code prints Error.

Answer: A

Question 5

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

Page: 1 / 94

Total 469 Questions | Updated On: Apr 03, 2026

Add To Cart