import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
public class UseComparator {
public static void main(String[] args) {
// TODO Auto-generated method stub
ArrayList arrayList = new ArrayList();
// Add elements to Arraylist
arrayList.add("A");
arrayList.add("B");
arrayList.add("C");
arrayList.add("D");
arrayList.add("E");
Comparator comparator = Collections.reverseOrder();
System.out.println("Before sorting ArrayList in descending order : " + arrayList);
Collections.sort(arrayList, comparator);
System.out.println("After sorting ArrayList in descending order : " + arrayList);
}
}
Console：
Before sorting ArrayList in descending order : [A, B, C, D, E]
After sorting ArrayList in descending order : [E, D, C, B, A]
