Moonlight_Showdown的博客

题目：Given an array of integers, return indices of the two numbers such that they add up to a specific target.You may assume that each input would have exactly one solution, and you may not use the same

StringBuffer:有直接函数reverse()直接进行反转； 举个简单例子-- 将一个数字反转并判断是否为回文，即是否将此数反转所的值与原值相同 public class Demo { public static void main(String args[]){ int a = 12345; String s = String.valueOf(a);//将数字变为字符串