Here you can find the source of isWeekend(GregorianCalendar date)
public static boolean isWeekend(GregorianCalendar date)
//package com.java2s; /**/* w w w . ja v a 2 s . c o m*/ * Copyright 2007 Slawomir Wojcicki * <p/> * 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 * <p/> * http://www.apache.org/licenses/LICENSE-2.0 * <p/> * 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.GregorianCalendar; public class Main { public static boolean isWeekend(GregorianCalendar date) { return isSaturday(date) || isSunday(date); } public static boolean isSaturday(GregorianCalendar date) { return date.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY; } public static boolean isSunday(GregorianCalendar date) { return date.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY; } }