I'm wanting to have my JLabel display values in the format of HH:mm:ss without making use of any external libraries. (the label will update every second)
So for example, the following input in seconds and the desired output are below:
Seconds: Output:
--------------------------------------------------
long seconds = 0 00:00:00
long seconds = 5 00:00:05
long seconds = 500 00:08:20
long seconds = 5000 01:23:20
Note: the seconds value is of type long
I'm aware that typically one would just do the following conversions to get the desired numbers:
long s = 5000; //total seconds
long hrs = (s / 3600) //hours
long mins = ((s%3600)/60) //minutes
long secs = (s%60) //seconds
However, this leaves decimals on the values. Perhaps there is some sort of formatting that will allow me to toss the un-needed decimals.
Options I have come across were String.format(), SimpleDateFormat(), or concatenating a string myself.
The thing is, I will be updating this JLabel every second and sometimes it can count to the equivalent of 5-6 days if not longer.
So I'm looking for someone who has more experience in the area than I, and knows the most efficient way to tackle this issue.
If you don't want to use a formatter class, you can get your work done by using basic operations like conversion among wrapper classes and String operations. Take a look at this code:
long h, m, s; // Initialize them after calculation.
String h1, m1, s1;
h1 = Long.toString( h );
m1 = Long.toString( m );
s1 = Long.toString( s );
if ( s1.length() < 2 )
s1 = "0" + s1;
if ( m1.length() < 2 )
m1 = "0" + m1;
if ( h1.length() < 2 )
h1 = "0" + h1;
String output = h1+":"+m1+":"+s1;
Supposing you have correctly calculated values of seconds, minutes and hours, you can gather String versions of these variables, then format them with a simple length check and finally concatenate these time unit parts.