Here you can find the source of validateDayOfMonth(int day)
private static void validateDayOfMonth(int day)
//package com.java2s; /* /*from w w w . j a v a 2s.c o m*/ * Copyright 2001-2009 James House * * 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 { public static final int LAST_DAY_OF_MONTH = -1; private static void validateDayOfMonth(int day) { if ((day < 1 || day > 31) && day != LAST_DAY_OF_MONTH) { throw new IllegalArgumentException("Invalid day of month."); } } }