Java Collections Framework MCQs Questions | Java Program MCQs

import java.util.*;
class Linkedlist 
{
    public static void main(String args[]) 
    {
        LinkedList obj = new LinkedList();
        obj.add("A");
        obj.add("B");
        obj.add("C");
        obj.addFirst("D");
        System.out.println(obj);
    }
}

import java.util.*;
class Maps 
{
    public static void main(String args[]) 
    {
        HashMap obj = new HashMap();
        obj.put("A", new Integer(1));
        obj.put("B", new Integer(2));
        obj.put("C", new Integer(3));
        System.out.println(obj.get("B"));
    }
}

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() + " ");
    }
}