Java Collections Framework
practice.

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);
        System.out.print(obj.get(3));
    }
}

Which of these are legacy classes?

What will be the output of the following Java program?

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);
    }
}

Which of these class can generate an array which can increase and decrease in size automatically?

What are the initial capacity and load factor of HashSet?

What will be the output of the following Java 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();
  while(i.hasNext())
      System.out.print(i.next() + " ");
    }
}

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.sort(list);
        while(i.hasNext())
      System.out.print(i.next() + " ");
    }
}

What will be the output of the following Java program?

import java.util.*;
class Output 
{
    public static void main(String args[]) 
    {
        HashSet obj = new HashSet();
        obj.add("A");
        obj.add("B");
        obj.add("C");
        System.out.println(obj + " " + obj.size());
    }
}

Do we have get(Object o) method in HashSet.

Which of these standard collection classes implements a linked list data structure?

Which of these methods deletes all the elements from invoking collection?

What does Collections.emptySet() return?

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);
    }
}

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);
   }
}

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());
    }
}

Which of these object stores association between keys and values?

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() + " ");
    }
}

Which of these methods can be used to search an element in a list?

How can we remove an object from ArrayList?

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());
    }
}