package com.haliluya.java.oj;import java.util.Scanner;public class judgyDay {private static final int startYear = 1900;private static final int[][] dayMap = { {0,1,2,3,4,5,6},{1,2,3,4,5,6,0},{2,3,4,5,6,0,1},{3,4,5,6,0,1,2},{4,5,6,0,1,2,3},{5,6,0,1,2,3,4},{6,0,1,2,3,4,5}};public static void main(String[] args) {Scanner s = new Scanner(System.in);System.out.println("请输入年");int year = s.nextInt();System.out.println("请输入月");int month = s.nextInt();System.out.println("请输入号");int hao = s.nextInt();System.out.println("输入的年 = "+year);System.out.println("输入的月 = "+month);System.out.println("输入的日 = "+hao);int dayOfWant = 0;dayOfWant = judgyDayOfAnyYearAnyMonth(year,month,hao);System.out.println("对应的星期为 （从0算） = "+dayOfWant);}/** * 根据输入的年 月以及号 得到改天的星期数 * @param year * @param month * @param hao * @return */private static int judgyDayOfAnyYearAnyMonth(int year, int month, int hao) {//参数检查if(year< 1900 ||year >9999 ){return -1;}if(month<0 ||month >12){return -1;}if(hao<0 || hao>31 ){return -1;}//业务开始//1 算出该月1号距离1900年1月1号多少天int daysOfLastMonthTotal = gatDaysOfLastMonthTotal(year,month);//2 的出该月1号是星期几int firstDay = daysOfLastMonthTotal %7;System.out.println("给定的月初星期几（从0算） = "+(firstDay));//3 算出该号是星期几int dayJudgyByFirstDay = getDayJudgyByFirstDay(firstDay,hao);return dayJudgyByFirstDay;}private static int getDayJudgyByFirstDay(int firstDay, int hao) {hao = hao%7;if(hao ==0){hao =7;}hao -=1;//调整到0下标System.out.println("取map的第 "+firstDay + "行，第"+ hao +"列");return dayMap[firstDay][hao];}/** * 算出给定年月的第一天的距离1900的天数 * @param year * @param month * @return */private static int gatDaysOfLastMonthTotal(int year, int month) {// 先算年的求和int totalday = 0;for(int thisYear = startYear ;thisYear<year ;thisYear++){totalday += getTotalDaysByYear(thisYear);}//再不上月的求和for(int i = 1;i <month;i++){switch(i){case 1: case 3: case 5: case 7: case 8: case 10: case 12: totalday+= 31;break;case 2: if(isRunYear(year)){totalday+= 29;break;}else{totalday+= 28;break;}case 4: case 6: case 9: case 11:totalday+= 30;break; }}System.out.println("给定年月的第一天距离1900的天数 = "+totalday);return totalday;}/** * 判断该年有多少天 * @param thisYear * @return */private static int getTotalDaysByYear(int thisYear) {if((thisYear%4 ==0 && thisYear %100!= 0)||thisYear%400 ==0){return 366;//二月多一天 29天}return 365;}private static boolean isRunYear(int thisYear){return ((thisYear%4 ==0 && thisYear %100!= 0)||thisYear%400 ==0);}}
