Java判断字符串是否为数字（正则表达式）

package com.walker;import java.util.regex.Matcher;import java.util.regex.Pattern;public class Tester {    public static void main(String[] args) {        String str = "123"; //true        System.out.println(isNumeric(str));                    str = "-123";   //true        System.out.println(isNumeric(str));                    str = "abc";    //false        System.out.println(isNumeric(str));    }            //@ author: walker    //用正则表达式判断字符串是否为数字（含负数）    public static boolean isNumeric(String str) {        String regEx = "^-?[0-9]+$";        Pattern pat = Pattern.compile(regEx);        Matcher mat = pat.matcher(str);        if (mat.find()) {            return true;        }        else {            return false;        }    }}

*** walker ***