Question 1

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

1. package com.udayan.ocp;

2.

3. class M {

4. private int num1 = 100;

5. class N {

6. private int num2 = 200;

7. }

8.

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

10. M outer = new M();

11. M.N inner = outer.new N();

12. System.out.println(outer.num1 + inner.num2);

13. }

14. }

Options :

A : 300

B : 200

C : Compilation error

D : 100

Answer: A

Question 2

Given the code fragments:

and

What is the result?

Options :

A : null

B : A compilation error occurs.

C : DogCatMouse

D : [Dog, Cat, Mouse]

Answer: D

Question 3

Given the code fragment:

List<String> colors = Arrays.asList(“red”, “green”, “yellow”);

Predicate<String> test = n - > {

System.out.println(“Searching…”);

return n.contains(“red”);

};

colors.stream()

.filter(c -> c.length() >= 3)

.allMatch(test);

What is the result?

Options :

A :

Searching…

B :

Searching…

C :

Searching…

D :

A compilation error occurs.

Answer: C

Question 4

Consider the code of Greet.java file:

1. package com.udayan.ocp;

2.

3. public final class Greet {

4. private String msg;

5. public Greet(String msg) {

6. this.msg = msg;

7. }

8.

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?

Options :

A : Yes

B : No

Answer: B

Question 5

Given the code fragment:

List<String> empDetails = Arrays.asList(“100, Robin, HR”,

“200, Mary, AdminServices”,

“101, Peter, HR”);

empDetails.stream()

.filter(s-> s.contains(“1”))

.sorted()

.forEach(System.out::println); //line n1

What is the result?

Options :

A : 100, Robin, HR 101, Peter, HR

B : A compilation error occurs at line n1.

C :

100, Robin, HR

101, Peter, HR

200, Mary, AdminServices

D :

100, Robin, HR

200, Mary, AdminServices

101, Peter, HR

Answer: A

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