living打牌的时候出牌太慢, 其他人就叫着'出啊','出啊', 就变成了歘HomeAboutMusichubblesiteNovember 7th, 2013No commentshttp://hubblesite.org/gallery/album/entire/Categories: baseTags:一个简单的caculatorMay 28th, 2013No comments题目是这样的:实现一个函数，计算出加法和乘法的合法的混合算术表达式的值。这个函数通过char c = getchar（）获取字符，变量c的取值范围在：1）0,1,2,3,4,5,6,7,8,92）*，+3）=当c 是 = 时，计算出算术表达式的值。即实现一个简单的计算器功能。其中1）和2）的字符可多次出现，但3）的等号 = 只出现一次。要求：空间复杂度为O（1），时间复杂度为O（n）。假定算术表达式合法，不存在“1+1++2=”。不用考虑非法格式和溢出等所有异常。提示：不要用栈。实例：12+3*4+56=，返回80；1+2*3*4+5*6+78=，返回133；123*2+3*4=,返回258.刚开始写了一下, 觉得挺乱, 后来想想,那么带加和乘的操作范式应该大致是这样n1 plus (n2 (scale n3)+)+,于是很快有了代码public class Caculator {public static void main(String[] args) {String expression = "34+123*35+12*78+10=";System.out.println(caculate(expression));expression = "34*123*35+12*78+123*10=";System.out.println(caculate(expression));}private static int caculate(String expression) {int i = 0;int startIndex = -1;int currentScaleNum = 1;boolean currentOperateScale = false;int currentPlusNum = 0;for(char c : expression.toCharArray()) {if (c == '=') {int currentNum = getNumber(expression, startIndex, i);startIndex = -1;if(currentOperateScale) {currentNum = currentScaleNum * currentNum;currentOperateScale = false;currentScaleNum = 0;}currentPlusNum = currentPlusNum + currentNum;} else if (c == '+') {int currentNum = getNumber(expression, startIndex, i);startIndex = -1;if(currentOperateScale) {currentNum = currentScaleNum * currentNum;currentOperateScale = false;currentScaleNum = 1;}currentPlusNum = currentPlusNum + currentNum;} else if(c == '*') {int currentNum = getNumber(expression, startIndex, i);startIndex = -1;currentScaleNum = currentScaleNum * currentNum;currentOperateScale = true;} else {if(startIndex == -1) {startIndex = i;}}i++;}return currentPlusNum;} private static int getNumber(String expression, int startIndex, int endIndex ) {String tmp = expression.substring(startIndex, endIndex);return Integer.parseInt(tmp);}}Categories: baseTags: java, plus, scaleHTTPCLIENT之CLOSE_WAITJanuary 24th, 2013No comments昨天一应用经常发生莫名的问题, 页面打不开, 后台又无明显的错误异常日志, 使用的httpclient会报一个no connection is free的信息, 报日志的时间刚好是请求不能正常返回时, 查看网络状态发现大量的tcp connection处于CLOSE_WAIT, 数目刚好是配置的connection pool max值. debug发现httpclient的部分get请求返回404或timeout, 而我们的manager是设定了keepalive的, 仔细看了httpclient的sample发现一个关键的操作丢失了, 即 httpGet.abort(), 我们的代码写的不严谨导致.  修改代码片段如下:HttpGet httpGet = new HttpGet(requestUrl);try {HttpResponse response = httpClient.execute(httpGet);if(response.getStatusLine().getStatusCode() != 200) {httpGet.abort();return null;}..} catch(Exception e) {httpGet.abort();.}当返回不为200时, 或发生异常时显示的调用下httpGet.abort(), 让connectionManager去做关闭链接的操作.Categories: technicTags: close_wait, httpclient干掉defunct进程November 23rd, 2012No comments今天在ubuntu下碰到一个进程状态为defunct, kill -9 都干不掉, 网上搜了一下, 只要干掉父进程, 99%的概率下, 该进程会自动消失, 果断一次, 干掉启动此进程的shell终端, 嗯, 有效Categories: baseTags: defunct, processfirefox的换行符处理November 6th, 2012No comments今天碰到一个问题,ubuntu下firefox版本为16.0.2, windows下firefox版本也是16.0.2. 在textarea下,输入的换行的unicode 10进制值为10,但是提交表单后变成了%0D