Here you can find the source of isLeapYear(final int year)
public static boolean isLeapYear(final int year)
//package com.java2s; /**// www .j a v a 2s . c o m * Copyright 2013-present febit.org (support@febit.org) * * 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 boolean isLeapYear(final int year) { return ((year % 4) == 0) // must be divisible by 4... && ((year < 1582) // and either before reform year... || ((year % 100) != 0) // or not a century... || ((year % 400) == 0)); // or a multiple of 400... } }