Free Oracle 1Z0-809 Exam Questions

Given code of Test.java file: 

1. package com.udayan.ocp;

2.  

3. import java.util.Arrays;

4. import java.util.Comparator;

5. import java.util.List;

6.  

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?

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?

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?

Given code of Test.java file:

package com.udayan.ocp;

import java.util.Arrays;

import java.util.List;

public class Test {

    public static void main(String[] args) {

        List list = Arrays.asList("A", "E", "I", "O");

        list.add("U");

        list.forEach(System.out::print);

    }

}

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