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Welcome to the java util MCQs Page

Dive deep into the fascinating world of java util with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of java util, a crucial aspect of Java Programming. In this section, you will encounter a diverse range of MCQs that cover various aspects of java util, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Java Programming.

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Check out the MCQs below to embark on an enriching journey through java util. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Java Programming.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of java util. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

java util MCQs | Page 12 of 18

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Q111.
Which of this interface must contain a unique element?
Discuss
Answer: (a).Set
Q112.
Which of these is a Basic interface that all other interface inherits?
Discuss
Answer: (d).Collection
Q113.
Which of these is static variable defined in Collections?
Discuss
Answer: (d).All of the mentioned
Q114.
What is the output of this program?
    import java.util.*;
    class Array 
    {
        public static void main(String args[]) 
        {
            int array[] = new int [5];
            for (int i = 5; i > 0; i--)
                array[5 - i] = i;
            Arrays.sort(array);
            for (int i = 0; i < 5; ++i)
             System.out.print(array[i]);;
        }
    }
Discuss
Answer: (a).12345
Q115.
What is the output of this program?
    import java.util.*;
    class Collection_Algos 
    {
        public static void main(String args[]) 
        {
            LinkedList list = new LinkedList();
            list.add(new Integer(2));
            list.add(new Integer(8));
            list.add(new Integer(5));
            list.add(new Integer(1));
            Iterator i = list.iterator();
            Collections.reverse(list);
     Collections.sort(list);
            while(i.hasNext())
         System.out.print(i.next() + " ");
        }
    }
Discuss
Answer: (c).1 2 5 8
Q116.
What is the output of this program?
    import java.util.*;
    class Collection_Algos 
    {
        public static void main(String args[]) 
        {
            LinkedList list = new LinkedList();
            list.add(new Integer(2));
            list.add(new Integer(8));
            list.add(new Integer(5));
            list.add(new Integer(1));
            Iterator i = list.iterator();
            Collections.reverse(list);
     Collections.shuffle(list);
            while(i.hasNext())
         System.out.print(i.next() + " ");
        }
    }
Discuss
Answer: (d).Any random order
Q117.
Which class is used to generate random number?
Discuss
Answer: (c).java.util.Random
Q118.
Which method is used to generate boolean random values in java?
Discuss
Answer: (a).nextBoolean()
Q119.
What is the return type of Math.random() method?
Discuss
Answer: (b).Double
Q120.
Random is a final class?
Discuss
Answer: (b).False

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