import java.util.*;
class ListDemo
{
public static void main(String as[])
{
ArrayList list =new ArrayList();
list.add(123);
list.add(42.26);
list.add("Hello");
list.add(true);
list.add("Hello");
list.add(12.56);
System.out.println("The list is : "+list);
System.out.println("The length of list is : "+list.size());
System.out.println("Is list is empty???  "+list.isEmpty());
/*list.clear();
System.out.println("Is list is empty???  "+list.isEmpty());*/
System.out.println("Is list Contains Hello "+list.contains("Hello"));
ArrayList list2=new ArrayList();

list2.add("First");
list2.add("Second");
list2.add("Third");
list2.add("Four");
list2.add("Five");

//list.add(list2);
list.addAll(list2);
System.out.println("Now,The list is : "+list);
System.out.println("The length of list is : "+list.size());
list.removeAll(list2);
//list.retainAll(list2);
System.out.println("Now,The list is : "+list);

//list.set(3,"Java");
list.add(3,"Java");
System.out.println("Now,The list is : "+list);

System.out.println("The 3rd element in list is : "+list.get(3));

System.out.println("The 1st Hello in list is : "+list.indexOf("Hello"));
System.out.println("The last Hello in list is : "+list.lastIndexOf("Hello"));



for(int i=0;i<list.size();i++)
{System.out.println("The element : "+i+" is "+list.get(i));}


/*Object ob[]=list.toArray();
for(int i=0;i<list.size();i++)
{System.out.println("The element : "+i+" is "+ob[i]);}*/

/*Iterator it=list.iterator();
while(it.hasNext())
{
System.out.println("The element : is "+it.next());
}*/

}
}