Java Collections Framework
practice.

Which of the below does not implement Map interface?

Which of these classes provide implementation of map interface?

Which of these methods is used to retrieve elements in BitSet object at specific location?

Which of these exceptions is thrown by remover() method?

Which of these method of HashSet class is used to add elements to its object?

What will be the output of the following Java 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);
        System.out.print(Arrays.binarySearch(array, 4));
    }
}

What will be the output of the following Java program?

class Output 
{
    public static void main(String args[]) 
    {
        ArrayList obj = new ArrayList();
        obj.add("A");
        obj.add("D");
        obj.ensureCapacity(3);
        obj.trimToSize();
        System.out.println(obj.size());
     }      
}

Which of this interface must contain a unique element?

What is the difference between length() and size() of ArrayList?

If the size of the array used to implement a circular queue is MAX_SIZE. How rear moves to traverse inorder to insert an element in the queue?

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);
  Collections.shuffle(list);
        i.next();
        i.remove();
        while(i.hasNext())
      System.out.print(i.next() + " ");
    }
}

PriorityQueue is thread safe.

Which of these method is used to make a bit zero specified by the index?

Which of these is a method of class Date which is used to search whether object contains a date before the specified date?

Which of these is a class which uses String as a key to store the value in object?

When two threads access the same ArrayList object what is the outcome of the program?

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.add(0, "B");
        System.out.println(obj.size());
    }
}

Which data structure is used in Breadth First Traversal of a graph?

Which of these classes is not part of Java's collection framework?