java 的一道题

题目：输入某年某月某日，判断这一天是这一年的第几天？
1.程序分析：以3月5日为例，应该先把前两个月的加起来，然后再加上5天即本年的第几天，特殊情况，闰年且输入月份大于3时需考虑多加一天。

import java.util.Scanner;

//题目：输入某年某月某日，判断这一天是这一年的第几天
public class ThisDayIs {
public static void main(String[] args) {
System.out.println("请输入年份，如：2008");
Scanner YMD = new Scanner(System.in);
int year = YMD.nextInt();
System.out.println("请输入月份1~12，如8");
int month = YMD.nextInt();
System.out.println("请输入天数1~31，如8");
int day = YMD.nextInt();
if (LeapYear(year)) {
switch (month) {
case 1: {
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 2: {
day = day + 31;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 3: {
day = day + 29 + 31;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 4: {
day = day + 29 + 31 * 2;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 5: {
day = day + 29 + 31 * 2 + 30;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 6: {
day = day + 29 + 31 * 3 + 30;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 7: {
day = day + 29 + 31 * 3 + 30 * 2;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 8: {
day = day + 29 + 31 * 4 + 30 * 2;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 9: {
day = day + 29 + 31 * 5 + 30 * 2;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 10: {
day = day + 29 + 31 * 5 + 30 * 3;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 11: {
day = day + 29 + 31 * 6 + 30 * 3;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 12: {
day = day + 29 + 31 * 6 + 30 * 4;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
}
} else
switch (month) {
case 1: {
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 2: {
day = day + 31;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 3: {
day = day + 28 + 31;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 4: {
day = day + 28 + 31 * 2;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 5: {
day = day + 28 + 31 * 2 + 30;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 6: {
day = day + 28 + 31 * 3 + 30;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 7: {
day = day + 28 + 31 * 3 + 30 * 2;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 8: {
day = day + 28 + 31 * 4 + 30 * 2;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 9: {
day = day + 28 + 31 * 5 + 30 * 2;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 10: {
day = day + 28 + 31 * 5 + 30 * 3;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 11: {
day = day + 28 + 31 * 6 + 30 * 3;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
case 12: {
day = day + 28 + 31 * 6 + 30 * 4;
System.out.println("这是" + year + "的第" + day + "天");
break;
}
}
}

private static boolean LeapYear(int year) {
if (year % 4 == 0 || year % 100 == 0){
System.out.print(year+"是闰年");
return true;
}
else
return false;
}
}

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