date 转换

import java.text.ParseException;   
import java.text.SimpleDateFormat;   
import java.util.Date;   
  
public class TestDate {   
  
       
    public static void main(String[] args) throws ParseException {   
        Date d=null;            //Date dd="";写法错误          
        System.out.println(d);     
           
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy/MM/dd");   
        String date1=sdf.format(new Date(1989899964));   
           
        Date date=new Date();   
        String date2=sdf.format(date);//date->String   
           
        System.out.println("format date(long):" + date1);   
        System.out.println("new date():" + date);   
        System.out.println("format new date():" + date2);   
        System.out.println(sdf.parse("1969/2/23").after(date));//date之间的比较   
    }     
}