MCQs 2024Java Test

1. Which of the following will import only static members of java.util.Arrays class?

Ans: import static java.util.Arrays;

2. Which of the following is not a property of a JVM?

Ans: It prevents Java bytecode from being easily decoded/decompiled.

3. Object which can store group of other objects is called

Ans: Collection object

4. Non-static nested classes have access to from enclosing class.

Ans: All the members

5. What will be the output for the following code snippet?

ArrayList a1 = new ArrayList();
a1.add("Ravi");
a1.add("Vijay");

Iterator it = a1.iterator();
System.out.println(it.next());

Ans: Ravi

6. Choose the correct option to fill the below code

Answer: sc.nextInt(); sc.next(); sc.nextDouble();

7. Which of the statement is incorrect?

Ans: Every class must contain a main() method.

8. What is the output the following code?

Ans: 1

9. If there are 5 classes, E is derived from D, D from C, C from B and B from A. which class construct will be called first if the object of E or D is created?

Ans: A

10. What will be the output of the following code?

Ans:  a.y = 5
      b.y = 6
      a.x = 2
      b.x = 2
IdentifyMyParts.x = 2

11. We want this code to print the titles of each book twice. Why doesn’t it?

Ans: None of the above. The code does print each book title twice.

12. What will be the output for the following code snippet?

HashMap map = new HashMap();
map.put(1, "E-Box");
map.put(2, "Learning and Assessment");
map.put(3, "Platform");
map.remove(0);
System.out.println("Values after remove: "+map);

Ans: Values after remove: {1=E-Box, 2-Learning and Assessment, 3=Platform}

13. How to convert Date object to String?

Ans: SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-mm-dd”); Sdf.format(new Date());

14. If an exception occurs within the block, the appropriate exception-handler that is associated with the try block handles the exception.

Ans: try

15. Choose the correct option based on this program?

Answer: When executed, this program prints the following: “The removed element is: 1”

16. Choose the option that contains only primitive literals.

Ans: 1.2D, 1f, ‘c’

17. What is the output of this program?

Ans: The program runs fine and displays x[0] is 0.

18. What is one of the most important reasons that Java supports extending classes via inheritance?

Ans: Developers minimize duplicate code in new classes by sharing code in a common parent class.

19. Predict the output.

Ans: [Char, acte, r de, cide, s th, e re, spec, t]

20. Consider the following code snippet. If you deserialize the object and print the field term (term is declared as int and is not a transient), what will it print?

Ans: 57

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