ArrayListSort

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

public class ArrayListSort {
public static void main(String[] args) {
ArrayList<Integer> al = new ArrayList<Integer>();
al.add(3);
al.add(1);
al.add(2);
System.out.println(al);
Collections.sort(al);
System.out.println(al);

Comparator<Integer> comparator = Collections.reverseOrder();
Collections.sort(al,comparator);
System.out.println(al);
}
}