Free Oracle 1Z0-809 Exam Questions

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. public class Test {

4.     private static void m1() throws Exception {

5.         throw new Exception();

6.     }

7.  

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

9.         try {

10.             m1();

11.         } finally {

12.             System.out.println("A");

13.         }

14.     }

15. }

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

Given code of Test.java file:

1. package com.udayan.ocp;

2.  

3. interface Printer1 {

4.     default void print() {

5.         System.out.println("Printer1");

6.     }

7. }

8.  

9. class Printer2 {

10.     public void print() {

11.         System.out.println("Printer2");

12.     }

13. }

14.  

15. class Printer extends Printer2 implements Printer1 {

16.  

17. }

18.  

19. public class Test {

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

21.         Printer printer = new Printer();

22.         printer.print();

23.     }

24. }

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.List;

4. import java.util.Map;

5. import java.util.stream.Collectors;

6. import java.util.stream.Stream;

7.  

8. class Certification {

9.     String studId;

10.     String test;

11.     int marks;

12.  

13.     Certification(String studId, String test, int marks) {

14.         this.studId = studId;

15.         this.test = test;

16.         this.marks = marks;

17.     }

18.  

19.     public String toString() {

20.         return "{" + studId + ", " + test + ", " + marks + "}";

21.     }

22.  

23.     public String getStudId() {

24.         return studId;

25.     }

26.  

27.     public String getTest() {

28.         return test;

29.     }

30.  

31.     public int getMarks() {

32.         return marks;

33.     }

34. }

35.  

36. public class Test {

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

38.         Certification c1 = new Certification("S001", "OCA", 87);

39.         Certification c2 = new Certification("S002", "OCA", 82);

40.         Certification c3 = new Certification("S001", "OCP", 79);

41.         Certification c4 = new Certification("S002", "OCP", 89);

42.         Certification c5 = new Certification("S003", "OCA", 60);

43.         Certification c6 = new Certification("S004", "OCA", 88);

44.  

45.         Stream stream = Stream.of(c1, c2, c3, c4, c5, c6);

46.         Map> map =

47.                 stream.collect(Collectors.partitioningBy(s -> s.equals("OCA")));

48.         System.out.println(map.get(true));

49.     }

50. }

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