用函数方法实现list的倒序输出

package Homework5_8;import java.util.ArrayList;import java.util.List;/** * Created by Administrator on 2017/5/8. */public class Exp_20 {    public static void main(String[] args) {        List list = new ArrayList();        list.add("Hello");        list.add("World");        list.add("Learn");        System.out.println("原数组：");        System.out.println(list);        System.out.println("倒序后：");        reverseList(list);    }    private static void reverseList(List list) {        int s = list.size();        for (int i = 0; i <s/2 ; i++) {            list.set(s-1-i,list.set(i,list.get(s-1-i)));        }        System.out.println(list);    }
}
运行结果：
原数组：[Hello, World, Learn]倒序后：[Learn, World, Hello]