JAVA 题目：输入某年某月某日，判断这一天是这一年的第几天？

 
 1 package Training;
 2 
 3 //import java.util.Calendar;
 4 import java.util.Scanner;
 5 /**
 6  * 题目：输入某年某月某日，判断这一天是这一年的第几天？ 
 7  * 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。 
 8  * @author MoRua
 9  * @version 1.0
10  * 
11  */
12 
13 public class Time11 {
14     
15     public static int getTime(boolean isLeap,int month,int day) throws Throwable {
16         int sum=0;
17         
18         if(month>12||month<1||day>31||day<1) {
19             throw new Exception(" DAY ERROR");
20         }
21         
22         for(int i=1;i<=month;i++) {
23         switch (i) { //1 3 5 7 8 10 12 -> 2 4 6 8 9 11 12+
24         
25         case 1:
26             sum+=0;
27             break;
28             
29         case 2:
30         case 4:
31         case 6:
32         case 8:
33         case 9:
34         case 11:
35             if(day>30) {
36                 throw new Exception(" DAY ERROR");
37             }
38             sum+=31;
39             break;
40             
41         case 3:
42             if(isLeap){
43                 sum+=29;
44                 }
45             else
46                 sum+=28;
47             break;
48             
49         case 5:
50         case 7:
51         case 10:
52         case 12:
53             sum+=30;
54             break;
55             
56         default:
57             break;
58         }
59         }
60         sum+=day;
61         return sum;
62     }
63     
64     public static boolean isLeapYear(int year) {
65         if((year%4==0&&year%100!=0)||year%400==0)
66             return true;
67         return false;
68     }
69     
70     public static void main(String[] args) throws Throwable {    
71     int year;
72     int month;
73     int day;
74     @SuppressWarnings("resource")
75     Scanner scanner = new Scanner(System.in);
76     year=scanner.nextInt();
77     month=scanner.nextInt();
78     day=scanner.nextInt();
79     long startTime = System.currentTimeMillis();
80     
81     try {
82         System.out.println(" "+getTime(isLeapYear(year), month, day));
83     } catch (Exception e) {
84         System.out.println(e.getMessage());
85     }
86 
87     
88 //    Calendar calendar=Calendar.getInstance();
89 //    calendar.set(year,month,day);//设置calendar的年月日
90 //    int temp=calendar.get(Calendar.DAY_OF_YEAR);//得到当年第几天
91 //    System.out.println("你输入的日期是当年第"+(temp)+"天");
92     
93     long endTime = System.currentTimeMillis();
94     System.out.println("Time: "+(endTime-startTime));
95     }
96 }