Here you can find the source of format(final double value)
public static String format(final double value)
//package com.java2s; /*/*w w w . j av a 2 s. c om*/ * Copyright 2017 Red Hat, Inc. and/or its affiliates. * * 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.text.DecimalFormat; import java.text.DecimalFormatSymbols; public class Main { private static final DecimalFormat DF = new DecimalFormat("#0.00") { { setDecimalFormatSymbols(new DecimalFormatSymbols() { { setDecimalSeparator('.'); setGroupingUsed(false); } }); } }; public static String format(final double value) { return DF.format(value); } /** * As the generated values will end up in a source file, let's use a concrete formatting * for double values along all code generation. */ public static String format(final String pattern, final double... values) { final String[] raw = new String[values.length]; for (int i = 0; i < values.length; i++) { raw[i] = DF.format(values[i]); } return String.format(pattern, raw); } }