Here you can find the source of isNumeric(String input)
private static boolean isNumeric(String input)
//package com.java2s; /*! ****************************************************************************** * * Pentaho Data Integration//w w w.ja va2s . c om * * Copyright (C) 2002-2015 by Pentaho : http://www.pentaho.com * ******************************************************************************* * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * ******************************************************************************/ import java.util.regex.Pattern; public class Main { private static final Pattern NUMERIC_PATTERN = Pattern.compile("\\d+"); private static boolean isNumeric(String input) { boolean result = false; if (input != null) { result = NUMERIC_PATTERN.matcher(input).matches(); } return result; } }