Java实现了一个万年历
import java.util.Scanner;
public class DaysCelandar {
// 判断是不是闰月年
public static boolean isRun(int year) {
if ((year % 4 == 0 && year % 100 != 0) || year %100 == 0) {
return true;
} else {
return false;
}
}
// 统计输入年份到1990-1-1的天数
public static int dayTotals(int year, int month) {
int dayTotals = 0;
for (int i = 1990; i < year; i++) {
if (isRun(i)) {
dayTotals += 366;
} else {
dayTotals += 365;
}
}
for (int j = 1; j < month; j++) {
dayTotals += monthTotalDays(year, j);
}
return dayTotals;
}
// 判断指定年的指定月的天数
public static int monthTotalDays(int year, int month) {
int monthTotalDays = 31;
switch (month) {
case 4:
case 6:
case 9:
case 11:
monthTotalDays = 30;
case 2:
if (isRun(year)) {
monthTotalDays = 29;
} else {
monthTotalDays = 28;
}
break;
}
return monthTotalDays;
}
// 计算星期几
public static void main(String[] args) {
int year;
int day;
int month;
int days;
int monthTotals;
Scanner in = new Scanner(System.in);
System.out.println("请输入年份:");
year = in.nextInt();
System.out.println("请输入月份:");
month = in.nextInt();
//System.out.println(year + "年" + month + "月");
System.out.println();
/*
*if (isRun(year)) { System.out.println(year + "是闰年"); } else {
*System.out.println(year + "不是闰年"); }
*/
monthTotals = monthTotalDays(year, month);
//System.out.println(year + "年" + month + "月" + "共:" +monthTotals +
// "天");
days = dayTotals(year, month);
days++;
//System.out.println("1990-01-01 到现在共:" + dayTotals + "天");
day = days % 7;
System.out.println("星期日\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 count = 0;
for (int i = 0; i < day; i++) {
System.out.print("\t");
count++;
}
for (int j = 1; j <= monthTotals; j++) {
System.out.print(j+"\t");
count++;
if (count % 7 == 0) {
System.out.println();
}
}
}
}