输入一个年份和月份显示该月有多少天

 

package zzz;

import javax.swing.JOptionPane; 

public class llyytt {

 
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  String year=JOptionPane.showInputDialog(null,"请输入一个年份","梁燕婷",JOptionPane.QUESTION_MESSAGE);
  int year1=Integer.parseInt(year);
  String mouth=JOptionPane.showInputDialog(null,"请输入一个月份","梁燕婷",JOptionPane.QUESTION_MESSAGE);
  int mouth1=Integer.parseInt(mouth);
  int aa[]={31,28,31,30,31,30,31,31,30,31,30,31};
  if((year1@0==0)||(year1%4==0&&year10!=0))
      aa[1]=29;  
  JOptionPane.showMessageDialog(null, mouth1 + " mouth " + year1 + " year has " + aa[mouth1-1] + " days");
  } 
}