import java.util.*;
import java.lang.*;

public class SortList implements Comparator<Integer>{
   public static List<Integer> list;
   public static void main(String[] args) {
      list = Arrays.asList(3, 2);
      Collections.sort(list, new SortList());
      for(int c : list) System.out.println(c + " "); // makes this arraylist of 3, 2 into 2, 3.
   }
   @Override
   public int compare(Integer a, Integer b){
      return a - b;
   }
}