java - Convert integer minutes into String "hh:mm"

Question

I need to convert minutes (defined as Integer) into the following String format "hh:mm" assuming that the startTime is "00:00". The below-given code is what I have so far, but it does not work properly. Also it does not take into account that the newTime should be shifted in accordance to startTime. Is there any other solution?

String startTime = "00:00";
int minutes = 120;
double time = minutes/60;
String timeS = Double.toString(time);
String[] hourMin = timeS.split(".");
String h = hourMin[0];
String m = hourMin[1];
String newTime = "";    
newTime.concat(h+":"+m);

Answer 1

Here you go:

/*Output: 02:05 */
public String fromMinutesToHHmm(int minutes) {
    long hours = TimeUnit.MINUTES.toHours(Long.valueOf(minutes));
    long remainMinutes = min - TimeUnit.HOURS.toMinutes(hours);
    return String.format("%02d:%02d", hours, remainMinutes);
}

Kotlin version

class DateUtils {

    companion object {

        fun fromMinutesToHHmm(minutes: Int): String {
            val hours = TimeUnit.MINUTES.toHours(minutes.toLong())
            val remainMinutes = minutes - TimeUnit.HOURS.toMinutes(hours)
            return String.format("%02d:%02d", hours, remainMinutes)
        }

    }

}