ArrayList反转

Collections.reverse(arrayList);

import java.util.ArrayList;import java.util.Collections;  
public class Main {  
   public static void main(String[] args) {  
      ArrayList arrayList = new ArrayList();  
      arrayList.add("A");  
      arrayList.add("B");  
      arrayList.add("C");  
      arrayList.add("D");  
      arrayList.add("E");  
      System.out.println("反转前排序: " + arrayList);  
      Collections.reverse(arrayList);  
      System.out.println("反转后排序: " + arrayList);  
   }  
}