经典- 万年历

package Fenzhi;import java.util.Scanner;public class Class_jiangjie {/** * @param args */public static void main(String[] args) {for (;;) {Scanner input = new Scanner(System.in);System.out.print("请输入年份：");int nian = input.nextInt();System.out.print("请输入月份：");int yue = input.nextInt();int days = 0;switch (yue - 1) {case 12:days += 31;case 11:days += 30;case 10:days += 31;case 9:days += 30;case 8:days += 31;case 7:days += 31;case 6:days += 30;case 5:days += 31;case 4:days += 30;case 3:days += 31;case 2:if (nian % 4 == 0 && nian % 100 != 0 || nian % 400 == 0) {days += 29;} else {days += 28;}case 1:days += 31;}int day;switch (yue) {case 1:case 3:case 5:case 7:case 8:case 10:case 12:day = 31;case 4:case 6:case 9:case 11:day = 30;case 2:if (nian % 4 == 0 && nian % 100 != 0 || nian % 400 == 0) {day = 29;} else {day = 28;}for (int i = 1900; i < nian; i++) {if (i % 4 == 0 && i % 100 != 0 || i % 400 == 0) {days += 366;} else {days += 365;}}System.out.println("距离1900.1.1号");// 距离初始值的天数System.out.println(days);int a = days % 7 + 1;// 每个星期的一到七int b;// 新显示if (a == 7) {b = 0;// 把星期七定义为0} else {b = a;// 星期一到星期六照旧}System.out.println(nian + "年" + yue + "月一号是星期" + b);System.out.println("星期天/t" + "星期一/t" + "星期二/t" + "星期三/t"+ "星期四/t" + "星期五/t" + "星期六/t");int i;for (i = 0; i < a; i++) {System.out.print("/t");}for (int n = 0; n <= day; n++) {System.out.print(n + 1 + "/t");if ((days + n) % 7 == 5) {System.out.println();}}System.out.println();}}}}