Here you can find the source of isNumeric(String str)
public static boolean isNumeric(String str)
//package com.java2s; //License from project: Apache License import java.util.regex.Pattern; public class Main { public static boolean isNumeric(String str) { Pattern pattern = Pattern.compile("\\d+\\.\\d+$|-\\d+\\.\\d+$"); Pattern pattern2 = Pattern.compile("[0-9]*"); return pattern.matcher(str).matches() || pattern2.matcher(str).matches(); }/* w w w . java 2s .com*/ }