Java computing time difference and comparison time

Javaz processes a lot of date and time, and the code lists the method for calculating the difference between 3 and date and time.

For example, it is 13:31:40.
Past: 11:30:24
Now I want to get two date differences in the form of: XX days xx hours xx minutes XX seconds

Java computing time difference and comparison time
For example, it is 13:31:40.
Past: 11:30:24
Now I want to get two date differences in the form of: XX days xx hours xx minutes XX seconds

Method 1:
Dateformat df = new simpledateformat ("yyyy-mm-dd hh: mm: SS ");

Try
{
Date d1 = DF. parse ("13:31:40 ");
Date D2 = DF. parse ("11:30:24 ");
Long diff = d1.gettime ()-d2.gettime ();
Long days = diff/(1000*60*60*24 );
}
Catch (exception E)
{
}

Method 2: simpledateformat df = new simpledateformat ("yyyy-mm-dd hh: mm: SS ");
Java. util. Date Now = DF. parse ("13:31:40 ");
Java. util. Date date = df. parse ("11:30:24 ");
Long l = now. getTime ()-date. getTime ();
Long day = l/(24x60*60*1000 );
Long hour = (l/(60x60*1000)-day * 24 );
Long min = (l/(60*1000)-day * 24*60-hour * 60 );
Long s = (l/1000-day * 24*60*60-hour * 60*60-min * 60 );
System. out. println ("" + day + "day" + hour + "hour" + min + "Minute" + s + "second ");

Method 3:
SimpleDateFormat dfs = new SimpleDateFormat ("yyyy-MM-dd HH: mm: ss ");
Java. util. Date begin = dfs. parse ("11:30:24 ");
Java. util. Date end = dfs. parse ("13:31:40 ");
Long between = (end. getTime ()-begin. getTime ()/1000; // divide by 1000 to convert to seconds

Long day1 = between/(24*3600 );
Long hour1 = between % (24*3600)/3600;
Long minute1 = maid % 3600/60;
Long second1 = maid % 60/60;
System. out. println ("" + day1 + "day" + hour1 + "Hour" + minute1 + "Minute" + second1 + "second ");

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Java comparison time size

String s1 = "09:12:09 ";
String s2 = "09:12:11 ";
Java. text. DateFormat df = new java. text. SimpleDateFormat ("yyyy-MM-dd HH: mm: ss ");
Java. util. Calendar c1 = java. util. Calendar. getInstance ();
Java. util. Calendar c2 = java. util. Calendar. getInstance ();
Try
{
C1.setTime (df. parse (s1 ));
C2.setTime (df. parse (s2 ));
} Catch (java. text. ParseException e ){
System. err. println ("Incorrect format ");
}
Int result = c1.compareTo (c2 );
If (result = 0)
System. out. println ("c1 equal to c2 ");
Else if (result <0)
System. out. println ("c1 less than c2 ");
Else
System. out. println ("c1 greater than c2 ");

 

From: http://jackmlw.blog.sohu.com/140277739.html