ExamVeda
Login
Home

Java Collections Framework MCQs Questions | Java Program MCQs

Explore the Java Collections Framework with our multiple choice questions. Boost your understanding and excel in Java-related assessments. Page-4 section-2

Each section contains 100 MCQs on Collections Framework in java .
31
Which of these methods deletes all the elements from invoking collection?
Discuss
Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
32
What does Collections.emptySet() return?
Discuss
Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
33
What will be the output of the following Java code?
import java.util.*;
class Bitset
{
    public static void main(String args[])
    {
        BitSet obj = new BitSet(5);
        for (int i = 0; i < 5; ++i)
            obj.set(i);
        obj.clear(2);
        System.out.print(obj);
    }
}
Discuss
Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
34
What will be the output of the following Java code snippet?
public class Demo
{
  public static void main(String[] args)
  {
		Map sampleMap = new TreeMap();
		sampleMap.put(1, null); 
		sampleMap.put(5, null); 
		sampleMap.put(3, null); 
		sampleMap.put(2, null); 
		sampleMap.put(4, null); 
 
       System.out.println(sampleMap);
   }
}
Discuss
Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
35
What will be the output of the following Java code?
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());
    }
}
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
36
Which of these object stores association between keys and values?
Discuss
Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
37
What will be the output of the following Java program?
import java.util.*;
class Collection_iterators 
{
    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);
  while(i.hasNext())
      System.out.print(i.next() + " ");
    }
}
Discuss
Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
38
Which of these methods can be used to search an element in a list?
Discuss
Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
39
How can we remove an object from ArrayList?
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
40
What will be the output of the following Java program?
import java.util.*;
class Output 
{
    public static void main(String args[]) 
    {
        ArrayList obj = new ArrayList();
        obj.add("A");
        obj.ensureCapacity(3);
        System.out.println(obj.size());
    }
}
Discuss
Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board