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Detailed explanation of determining whether it is a decimal in java (regular method)

Nov 27, 2019 am 11:22 AM
java

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());      
    }
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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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