Java tutorial
//package com.java2s; public class Main { /** * This method converts the hours in milliseconds.<br> * @param hours {@link Integer} to convert in milliseconds. * @return {@link Long} number representing the milliseconds of hours given. * @throws IllegalArgumentException {@link Exception} if argument given is less of zero. */ public static long getMillisecondFromHours(int hours) throws IllegalArgumentException { if (hours < 0) throw new IllegalArgumentException("Hours given can not be less of zero."); return hours * 1000 * 60 * 60; } }