abclvlvlv的博客

list=mapper.selectList(model); //要排序的list，根据stock排序 Collections.sort(list, new Comparator<BookModel>(){ public int compare(BookModel o1, BookModel o2) { int i = o2.getStock() - o1.getStock(); //降序 //int i = o2.getStock() - o1.getStock...

var strStartIndex = url.indexOf("="); var strMid0Index = url.indexOf("-"); var id=url.substring(strStartIndex+1,strMid0Index);

String str= str.replace("\"", ""); //去掉左边的引号String str= str.replaceAll("\"", "") //去掉所有的引号

String p1=String.valueOf(num) //先将num变为String类型的p1boolean p2=p1.contains(".") //判断p1里面是否含"."，含则为小数，不含则为整形