java正则表达式——判断字符串为哪种类型的数字？

来源：互联网发布：淘宝店铺推广软件编辑：程序博客网时间：2024/05/11 13:14

在他人博客给出的代码基础上做了相应修改后，得到以下代码段来判断字符串是否为数字，为哪一类数字。

public class NumberValidation {//匹配函数private static boolean isMatch(String regex, String orginal){if (orginal == null || orginal.trim().equals("")) {            return false;        }Pattern pattern = Pattern.compile(regex);Matcher isNum = pattern.matcher(orginal);return isNum.matches();}//是否为正整数public static boolean isPositiveInteger(String orginal) {return isMatch("^\\+{0,1}[1-9]\\d*(\\,\\d{3})*", orginal);}//是否为负整数public static boolean isNegativeInteger(String orginal) {return isMatch("^-[1-9]\\d*(\\,\\d{3})*", orginal);}//是否为整数public static boolean isWholeNumber(String orginal) {return isMatch("[+-]{0,1}0", orginal) || isPositiveInteger(orginal) || isNegativeInteger(orginal);}//是否为正小数public static boolean isPositiveDecimal(String orginal){return isMatch("\\+{0,1}[0]\\.[1-9]*|\\+{0,1}[1-9]\\d*(\\,\\d{3})*\\.\\d*", orginal);}//是否为负小数public static boolean isNegativeDecimal(String orginal){return isMatch("^-[0]\\.\\d*|^-[1-9]\\d*(\\,\\d{3})*\\.\\d*", orginal);}//是否为小数public static boolean isDecimal(String orginal){return isMatch("[+-]{0,1}0{1}\\.0+", orginal) || isPositiveDecimal(orginal) || isNegativeDecimal(orginal);//return isMatch("[-+]{0,1}\\d+\\.\\d*|[-+]{0,1}\\d*\\.\\d+", orginal);}//是否为实数public static boolean isRealNumber(String orginal){return isWholeNumber(orginal) || isDecimal(orginal);}//正则表达式判断，有bug：7-9会识别为truepublic static boolean isNumeric(String orginal){return isMatch("[+-]{0,1}[1-9][0-9]*.?[0-9]*|[+-]{0,1}[0].?[0-9]*", orginal);}/** * @test */public static void main(String args[]){String ss="-0.999";System.out.println("正整数："+isPositiveInteger(ss));System.out.println("负整数："+isNegativeInteger(ss));System.out.println("整数："+isWholeNumber(ss));System.out.println("正小数："+isPositiveDecimal(ss));System.out.println("负小数："+isNegativeDecimal(ss));System.out.println("小数："+isDecimal(ss));System.out.println("实数："+isRealNumber(ss));System.out.println("shuzi："+isNumeric(ss));}}

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