Java：計算出生到現在多少天代碼

 

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;

//計算出生了多少天

public class Tian {

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  
  int year=0,month=0,day=0;
  int tianshu;
  Scanner scanner = new Scanner(System.in);
  System.out.print("請輸入年");
  year = scanner.nextInt();
  System.out.print("請輸入月");
  month = scanner.nextInt();
  System.out.print("請輸入日");
  day = scanner.nextInt();
  tianshu=manyday(year , month , day );
  System.out.println("您生活了："+tianshu+"天");
 }
 
 //輸入年月日，輸出天數
 private static int manyday(int year,int month,int day){ 
  int shu = 0;
  int todayyear,todaymonth,todayday;
  String sNow = "";
  int sheng=0;                         //某日期到年底的天數
  
  Date today = new Date();
  SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
  sNow = sdf.format(today);
  todayyear = Integer.parseInt(sNow.substring(0,4));
  todaymonth = Integer.parseInt(sNow.substring(4,6));
  todayday = Integer.parseInt(sNow.substring(6));
  
  //System.out.println(year + " . " + month + " . " + day + " . " + todayyear + " . " + todaymonth + " . " + todayday);
  
  for(int i = year + 1;i < todayyear;i ++){
   if (i % 4 == 0) {
    shu = shu + 366;
   } else {
    shu = shu + 365;
   }
  }
  
  sheng=howday(year, month, day);
  if(year % 4 == 0){
   sheng = 366 - sheng ;
  }else {
   sheng = 365 - sheng;
  }
   shu = shu + sheng + howday(todayyear, todaymonth, todayday);
  
  return shu;
 }
 //輸入年月日    返回該年的天數
 
 private static int howday(int year,int month,int day){ 
  int da[] = {1,3,5,7,8,10,12};
  int xiao[] = {4,6,9,11};
  int tian = 0;
  if(month == 1){
   tian = day;
  }
  else{
   for(int i = 1;i < month;i++){
    if(panduan(da, i)){
     tian = tian + 31;
    }
    else if(panduan(xiao, i)){
     tian = tian + 30;
    }
    else if ((i == 2)&&(year%4 == 0)) {
     tian = tian + 29;
    }else if ((i == 2)&&(year%4 != 0)) {
     tian = tian + 28;
    }
   }
   tian = tian + day;
 }
  return tian;
 }
 
 //判斷變量是否屬於數組
 private static boolean panduan(int[] a,int bianliang){
  boolean boo = false;
  for(int i = 0;i < a.length;i ++){
   if(a[i] == bianliang){
    boo = true;
    break;
   }
  }
  return boo;
 }
 

}

//請多多指導！