无聊写了个计算你活了多少天的Java程序

话说前些天在微博上看到一个可以看下你活了多少天的程序，是用新浪微博的API写的应用程序，我好奇地也想看下我到底活了多少天，于是就点进去了。哪知道还要允许它什么更新你的微博啊，把你的结果发布上去等等什么乱七八糟的。MLGB的，不就一小应用吗？突然受刺激的心血来潮地想自己写一个出来，于是立马开了vim开始写Java.其实这个程序一点也不难，不过是有点烦而已，有些地方要仔细。写完后跟网上的结果对比了下，基本都一致，花了几十分钟，收获了点点微不足道的成就感，也许，这就是当程序员的好处吧！

贴下代码：

import java.io.BufferedReader; import java.io.InputStreamReader; public class DaysOfLife { private int year,month,day; public DaysOfLife() { System.out.println("Pure your life!"); } public DaysOfLife(int y, int m, int d) { year = y; month = m; day = d; } private boolean isLeap(int y) { if((y%400==0)||(year%100!=0)&&(y%4==0)) return true; else return false; } private int getYearDays(int y) { if(isLeap(y)) { return 366; } else { return 365; } } private int getMonthDays(int m) { int days = 0; switch(m) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: days = 31; break; case 2: days = 28; break; case 4: case 6: case 9: case 11: days = 30; break; default: days = -1; break; } return days; } private int PassedDays(int y, int m, int d) { int days = d; switch(m) { case 1: break; case 2: days += 31; break; case 3: days += 59; break; case 4: days += 90; break; case 5: days += 120; break; case 6: days += 151; break; case 7: days += 181; break; case 8: days += 212; break; case 9: days += 243; break; case 10: days += 273; break; case 11: days += 304; break; case 12: days += 334; break; default: break; } if( m > 2 && isLeap(y) ) { days++; } return days; } private int LeftDays(int y, int m, int d) { int days = 0; switch(m) { case 1: days = 365 - d; break; case 2: days = 334 - d; break; case 3: days = 306 - d; break; case 4: days = 275 - d; break; case 5: days = 245 - d; break; case 6: days = 214 - d; break; case 7: days = 184 - d; break; case 8: days = 153 - d; break; case 9: days = 122 - d; break; case 10: days = 92 - d; break; case 11: days = 61 - d; break; case 12: days = 31 - d; break; default: break; } if( isLeap(y) == true && ((m < 2) || ((m == 2) && (d < 29))) ) { days++; } return days; } private int DaysOfYears(int from, int to) { to--; from++; int days = 0; for(int i=from; i<=to; i++) { if(isLeap(i)==true) { days += 366; } else { days += 365; } } return days; } public int Calculate(int y, int m, int d) { int days = 0; if( year==y && month==m ) { return day - d; } if( year==y ) { return PassedDays(year,month,day) - PassedDays(y,m,d); } days += DaysOfYears(y,year); days += PassedDays(year,month,day); days += LeftDays(y,m,d); return days; } public static void main(String args[]) { try { DaysOfLife myLife = new DaysOfLife(2011,3,21); System.out.println("Please input your birth day in format yyyy/mm/dd : "); BufferedReader f = new BufferedReader(new InputStreamReader(System.in)); String s = f.readLine(); int y = Integer.parseInt(s); s = f.readLine(); int m = Integer.parseInt(s); s = f.readLine(); int d = Integer.parseInt(s); System.out.println("Your birth is " + y + " : " + m + " : " + d ); int days = myLife.Calculate(y,m,d); System.out.println("Today is the " + days + " days of your life!" ); } catch(Exception e) { } } }