前言 今天看群里小伙伴问了一个非常有意思的问题: 使用 Map<String,Object> 对象接收前端传递的参数,在后端取参时,因为接口文档中明确该字段类型为 Long ,所以对接收的参数进行了强转,即 (Long)参数 ,但是却发生了类型转换异常,报错信息如下: class java.lang.Integer cannot be cast to class java.lang.Long (java.lang.Integer and java.lang.Long are in module
背景:有时候想不通阿帕奇的BeanUtils是怎么进行map和Bean互相转化的. 工作闲暇之余,自己写个一小段代码,一探究竟,试试才发现,原来一切并非我们想的那么什么和复杂. 注:这里只是简单实例,不追求严密的代码规范和异常处理. 首先,新建一个工具类BeanUtils.java. 辅助实体类Person.java,如下: public class Person { private String name; private int age; private boolean adult; pub
Hat’s Words Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 10993 Accepted Submission(s): 3944 Problem Description A hat’s word is a word in the dictionary that is the concatenation of exact
Reverse Words in a String 单词取反 whowhoha@outlook.com Question: Given an input string s, reverse the string word by word. For example, given s = "the sky is blue", return "blue is sky the". void reverseWords(string &s) { vector <