Collections MQC

Which of the following is a part of the Java Collections Framework?

• ArrayList

• Array

• int[]

• String

Which collection does not allow duplicate elements?

• List

• Set

• Map

• All of the above

Which collection allows you to retrieve elements in the order they were inserted?

• HashSet

• Map

• LinkedList

• PriorityQueue

What is the implementation of the List interface?

• HashMap

• HashSet

• LinkedList

• LinkedHashSet

Which collection class is synchronized?

• HashSet

• TreeSet

• HashMap

• None

Which of the following collections is thread-safe?

• Vector

• ArrayList

In which collection are elements stored as key-value pairs?

• List

• Set

• Map

• Queue

What is output?

class Test {

    public static void main(String[] args) {

        for(int i = 0; true; i++) {

            System.out.println(i);

            break;

        }

    }

}

• 0

• 1

  2

  3

  .....

• None

• 10

  20

  30

What is the purpose of the continue statement in a loop?

• To exit the loop immediately

• To skip the current iteration and move to the next iteration

• To terminate the program

• To execute a specific block of code

Which loop construct guarantees that the loop body is executed at least once?

• for loop

• while loop

• do-while loop

• continue statement