import java.util.*;

public class arraylist

{

static Scanner sc=new Scanner(System.in);

public static void main(String[] args)

{

ArrayList<String> x=new ArrayList<String>(5);

System.out.println("ArrayLists are the advanced versions of array. These are collection classes which only refer to objects. ArrayLists only refer to objects, they don't edit them.\nEnter five elements for ArrayList:");

for(int i=0;i<5;i++)

{

x.add(sc.nextLine());

}

System.out.println("\nEntered elements:");

for(String s:x)

{

System.out.println(s);

}

System.out.println("\n\nIndex of the entered elements:");

for(String s:x)

{

int i=x.indexOf(s);

System.out.println("Element "+i+": "+s);

}

System.out.println("\n\nAnother way to print ArrayList using iterator. With the help of iterator,we can access elements in the arraylist:");

Iterator e=x.iterator();

while(e.hasNext())

{

System.out.println(e.next());

}

System.out.println("\n\nEnter the index of the element you want to update:");

int u=sc.nextInt();

sc.nextLine();

System.out.println("Enter the string with which you want to update:");

String k=sc.nextLine();

x.set(u,k);

System.out.println("\nArrayList after editing the element:\n"+x);

System.out.println("\n\nEnter the index of the element you want to remove:");

x.remove(sc.nextInt());

System.out.println("ArrayList after printing the elements:\n"+x);

}

}