1. 程式人生 > >用java實現輸入日期後得到這個日期是這一年的第多少天

用java實現輸入日期後得到這個日期是這一年的第多少天

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

/**
 * Created by pipi on 2016/3/24.
 */
public class DateIndex {


    public static void main(String[] args){
        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");
        String str = sdf.format(date);
        int
result = index(str); System.out.println(result); } public static int index(String date){ //2016/03/24 String[] arr = date.split("/"); /*for(int i = 0;i<arr.length;i++){ System.out.println(arr[i]); }*/ int mdays = 0; int x = 0; for
(int i = 1;i < Integer.parseInt(arr[1]);i++){ switch(i) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: x = 31; break; case
2: x = isRun(arr[0])? 29 : 28; break; default: x = 30; } mdays = mdays + x; } int days = mdays + Integer.parseInt(arr[2]); return days; } public static boolean isRun(String s){ int year = Integer.parseInt(s); if((year%4 == 0 && year%100 != 0)|| year%400 == 0) return true; return false; } }