/* 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
	{
		Integer a[]={1,2,3,4};
		List<Integer> list = Arrays.asList(a);
System.out.println(list);
Collections.reverse(list);
System.out.println(list);
	}
}