Here you can find the source of parseNumber(final String source, final String conversionPattern)
public static Number parseNumber(final String source, final String conversionPattern) throws ParseException
//package com.java2s; /*/* www . j a v a2 s . c o m*/ * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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.text.DecimalFormat; import java.text.DecimalFormatSymbols; import java.text.ParseException; import java.util.Locale; public class Main { private static final ThreadLocal<DecimalFormat> DECIMAL_FORMAT = new ThreadLocal<DecimalFormat>() { @Override protected DecimalFormat initialValue() { DecimalFormat df = new DecimalFormat(); df.setDecimalFormatSymbols(DecimalFormatSymbols.getInstance(Locale.ENGLISH)); return df; } }; public static Number parseNumber(final String source, final String conversionPattern) throws ParseException { DecimalFormat df = DECIMAL_FORMAT.get(); df.applyPattern(conversionPattern); return df.parse(source); } }