/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		ArrayList<Integer> list = new ArrayList<>();
		list.add(1);
		list.add(2);
		list.add(3);
		list.add(4);
 
		Iterator it = list.iterator();
 
		while(it.hasNext()){
			System.out.print(it.next() + " ");
		}
		System.out.println();
	}
}

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