Here you can find the source of isWeekend(Date date)
public static boolean isWeekend(Date date)
//package com.java2s; /*/* w w w . j a va 2s . c o m*/ * Copyright 2016 Hurence * * 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; import java.util.Date; public class Main { /** * Check if the date parameter occurs during a weekend. * * @return true or false */ public static boolean isWeekend(Date date) { if (date != null) { Calendar calendar = Calendar.getInstance(); calendar.setFirstDayOfWeek(Calendar.MONDAY); calendar.setTime(date); int dayOfTheWeek = calendar.get(Calendar.DAY_OF_WEEK); return dayOfTheWeek == Calendar.SATURDAY || dayOfTheWeek == Calendar.SUNDAY; } else { return false; } } }