使用Calendar对年月日的输出

package entity;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Calendar;public class showdate { static int y; static int m; static int d1; public showdate() { } private static boolean yun(int year) {  if (year%4==0&&year@0!=0){   return true;}    else{   return false;} }   public  static void main(String[] args) throws ParseException {  SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd");  Date date=f.parse("2004-2-2");  Calendar now = Calendar.getInstance();  now.setTime(date);       y=now.get(Calendar.YEAR);       m=now.get(Calendar.MONTH)+1;       d1=now.get(Calendar.DATE);  int[] a = { 1, 3, 5, 7, 8, 10, 12 };  int[] b = { 4, 6, 9, 11 };

  for (int i = 0; i < a.length; i++) {   if (m == a[i]) {    d1 = 31;    break;   }  }  for (int i = 0; i < b.length; i++) {   if (m == b[i]) {    d1 = 30;    break;   }  }  if (yun(y)==true && m == 2) {    d1 = 29;  }

  if (yun(y)==false && m == 2) {   d1 = 28;  }  System.out.print( y+ "/" + m + "/" + d1); }

}