Java：计算出生到现在多少天代码

 
import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Scanner;

//计算出生了多少天

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("请输入年");

  year = scanner.nextInt();

  System.out.print("请输入月");

  month = scanner.nextInt();

  System.out.print("请输入日");

  day = scanner.nextInt();

  tianshu=manyday(year , month , day );

  System.out.println("您生活了："+tianshu+"天");

 }

 

 //输入年月日，输出天数

 private static int manyday(int year,int month,int day){ 

  int shu = 0;

  int todayyear,todaymonth,todayday;

  String sNow = "";

  int sheng=0;                         //某日期到年底的天数

  

  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;

 }

 //输入年月日    返回该年的天数

 

 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;

 }

 

 //判断变量是否属于数组

 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;

 }

 

}

//请多多指导！