使用比较器降序排列ArrayList中的元素

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]