比较日期，Date类DateFormat类

[java]代码库

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*; 
public class Main{ 
    public static void main(String[] args )throws ParseException { 
         Scanner scan = new Scanner(System.in);
         String date1 = scan.next();
         String date2 = scan.next();
         DateFormat format = new SimpleDateFormat("MM,dd,yyyy");
         Date d1 = format.parse(date1);
         Date d2 = format.parse(date2);
         int a;
         if(d1.getTime() > d2.getTime()) {
        	 System.out.println(">");
        	 a = (int)((d1.getTime()-d2.getTime())/(1000*3600*24));
         }	 
         else if(d1.getTime() < d2.getTime()) {
        	 System.out.println("<");
        	 a = (int)((d2.getTime()-d1.getTime())/(1000*3600*24));
         }	 
         else {
        	 System.out.println("=");
        	 a = 0;
         } 
         System.out.println(a);
         
         scan.close();  
    } 
}