Several methods of comparison Date Size

• It summarizes several ways to compare the size of the date, but in fact were compared after all into a timestamp, then made a package for our use.

• Because relatively simple, directly on the code. Interested students can look directly into the point source.

  package chasen.utils;
  
  import java.text.ParseException;
  import java.text.SimpleDateFormat;
  import java.util.Date;
  
  public class CompareDate {
  
      public static void main(String args[]) throws ParseException {
          SimpleDateFormat simpleDateFormat = new SimpleDateFormat( "yyyy-MM-dd HH-mm-ss");
          String time1= "1996-10-24 23-59-59";
          String time2= "2018-03-29 23-59-59";
          Date date1 =  simpleDateFormat.parse(time1);
          Date date2 =  simpleDateFormat.parse(time2);
  
          //1.使用Date的compareTo()方法，大于、等于、小于分别返回1、0、-1
          System.out.println(date1.compareTo(date2));
  
          //2.使用时间戳（指的是从1970年1月1日起到该日期的毫秒数）直接比较大小
          System.out.println(date1.getTime() > date2.getTime());
  
          //3.使用Date的before()、after()方法
          System.out.println(date1.before(date2));//如果前者比后者小返回true，否则为false
          System.out.println(date1.after(date2));//如果前者比后者大返回true，否则为false
      }
  
  }

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