Java tutorial
//package com.java2s; /* * Copyright 2004-2014 the Seasar Foundation and the Others. * * 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.util.Calendar; public class Main { public static void moveToCalendarDay(Calendar cal, int day) { assertArgumentNotMinusNotZeroInteger("day", day); cal.set(Calendar.DAY_OF_MONTH, day); } protected static void assertArgumentNotMinusNotZeroInteger(String name, int value) { if (value <= 0) { String msg = "The argument '" + name + "' should be plus value: " + value; throw new IllegalArgumentException(msg); } } }