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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 7 of 18

Q61.
What is the output of this program?
    import java.util.*;
    class vector 
    {
        public static void main(String args[]) 
        {
            Vector obj = new Vector(4,2);
            obj.addElement(new Integer(3));
            obj.addElement(new Integer(2));
            obj.addElement(new Integer(5));
            System.out.println(obj.capacity());
        }
    }

a.

2

b.

3

c.

4

d.

6

Discuss
Answer: (c).4
Q62.
Which of these class object uses the key to store value?
Discuss
Answer: (d).All of the mentioned
Q63.
Which of these method is used to insert value and its key?
Discuss
Answer: (a).put()
Q64.
Which of these is the interface of legacy is implemented by Hashtable and Dictionary classes?
Discuss
Answer: (a).Map
Q65.
Which of these is a class which uses String as a key to store the value in object?
Discuss
Answer: (d).Properties
Q66.
Which of these methods is used to retrieve the elements in properties object at specific location?
Discuss
Answer: (d).getProperty()
Q67.
What is the output of this program?
    import java.util.*;
    class hashtable 
    {
        public static void main(String args[]) 
        {
            Hashtable obj = new Hashtable();
            obj.put("A", new Integer(3));
            obj.put("B", new Integer(2));
            obj.put("C", new Integer(8));
            System.out.print(obj.contains(new Integer(5)));
        }
    }
Discuss
Answer: (d).false
Q68.
What is the output of this program?
    import java.util.*;
    class hashtable 
    {
        public static void main(String args[]) 
        {
            Hashtable obj = new Hashtable();
            obj.put("A", new Integer(3));
            obj.put("B", new Integer(2));
            obj.put("C", new Integer(8));
            obj.clear();
            System.out.print(obj.size());
        }
    }

a.

0

b.

1

c.

2

d.

3

Discuss
Answer: (a).0
Q69.
Which of these class object has an architecture similar to that of array?
Discuss
Answer: (a).Bitset
Q70.
Which of these method is used to make a bit zero specified by the index?
Discuss
Answer: (d).clear()

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