java string类型日期比较

先转成date类型。再比较，比如：

 

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;

public class date {  

public static void main(String[] args) throws ParseException{  

 int compareTo=0;   

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");  

 String nowDate_String =   sdf.format( new Date() );   

String endDate_String = "2019-1-1";

        Date nowDate_Date = sdf.parse(nowDate_String);

  Date endDate_Date = sdf.parse(endDate_String);

  compareTo = nowDate_Date.compareTo(endDate_Date);

  if(compareTo == -1){

   System.out.println(nowDate_String+"比"+endDate_String+"早");

  }else{    

System.out.println(nowDate_String+"比"+endDate_String+"晚");   

}   

 }

}