


Detailed explanation of determining whether it is a decimal in java (regular method)
java使用正则判断是否小数的方法:(推荐:java视频教程)
public static void main(String[] args) { Pattern p1 = Pattern.compile("-?\\d+");//判断数字 Pattern p2 = Pattern.compile("(\\d+\\.\\d+)");//判断小数 Matcher m = p2.matcher("64.7"); System.out.println(m.matches()); }
判断是否小数的正则表达式详解:
\d 是匹配一个数字(0到9)
\\d 前面多了第一个\ 是为了在程序中转义第二个\,这个你可以忽略
+ 表示 1个或多个
组合起来
\\d+ 就表示多个数字,形如 12、44、6763……
\\. 匹配一个小数点
正则表达式\\d+\\.\\d+ 就表示小数,形如12.334、0.12、87.343
更多java知识请关注java基础教程栏目。
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