Here you can find the source of toDecimal(long seconds, int nanoseconds)
public static String toDecimal(long seconds, int nanoseconds)
//package com.java2s; /*//from w w w . jav a 2 s . c om * Copyright 2013 FasterXML.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. */ public class Main { private static final char[] ZEROES = new char[] { '0', '0', '0', '0', '0', '0', '0', '0', '0' }; public static String toDecimal(long seconds, int nanoseconds) { StringBuilder string = new StringBuilder(Integer.toString(nanoseconds)); if (string.length() < 9) string.insert(0, ZEROES, 0, 9 - string.length()); return seconds + "." + string; } }