Free Practice Oracle 1Z0-809 Exam Questions 2025

Given code of Test.java file: 

1. package com.udayan.ocp;

2.  

3. public class Test {

4.     private static String msg = "Hello";

5.  

6.     private static String changeMsg(String m) {

7.         msg = m;

8.         return null;

9.     }

10.  

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

12.         if(args.length == 0) {

13.             assert false : changeMsg("Bye");

14.         }

15.         System.out.println(msg);

16.     }

17. }

What will be the result of executing Test class with below command? 

java -ea com.udayan.ocp.Test

F: is accessible for reading and below is the directory structure for F:

1. F:.

2. └───A

3.     └───B

4.         └───C

5.                 Book.java

'Book.java' file is available under 'C' directory.

Given code of Test.java file: 

1. package com.udayan.ocp;

2.  

3. import java.nio.file.Path;

4. import java.nio.file.Paths;

5.  

6. public class Test {

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

8.         Path file = Paths.get("F:\\A\\B\\Book.java");

9.         System.out.println(file.toAbsolutePath());

10.     }

11. }

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

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?

Given code of Test.java file: 

1. package com.udayan.ocp;

2.  

3. import java.util.ArrayDeque;

4. import java.util.Deque;

5.  

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?