判断一个字符串是否为数值型字符串

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package com.sort;import java.util.regex.Matcher;import java.util.regex.Pattern;/** * 判断一个字符串是否为数值型字符串 *  * @author yangjianzhou 当是字符型字符串时返回1 否则返回0 *  */public class String1 {public static void main(String args[]) {System.out.println(isNumber1("+001"));System.out.println(isNumber2("+1001"));}/** * 使用字符串的matches方法 *  * @param s * @return */public static int isNumber1(String s) {String regex = "^[1-9][0-9]*\\.[0-9]+$|^[1-9][0-9]*$|^0+\\.[0-9]+$";char c = s.charAt(0);boolean bool;if (c == '+' | c == '-') {bool = s.substring(1).matches(regex);} else {bool = s.matches(regex);}if (bool) {return 1;} else {return 0;}}/** * 使用Pattern和Matcher类的方法 *  * @param s * @return */public static int isNumber2(String s) {String regex = "^[1-9][0-9]*\\.[0-9]+$|^[1-9][0-9]*$|^0+\\.[0-9]+$";Pattern pattern = Pattern.compile(regex);char c = s.charAt(0);if (c == '+' || c == '-') {s = s.substring(1);}Matcher matcher = pattern.matcher(s);boolean bool = matcher.matches();if (bool) {return 1;} else {return 0;}}}

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