import java.text.DecimalFormat; import java.time.Duration; import java.util.Random; class Main { public static void main(String[] args) { DecimalFormat myformatTime = new DecimalFormat("00"); Random r = new Random(); int Low1 = 1; int High1 = 24; int Low2 = 1; int High2 = 60; int Result1 = 0; int Result2 = 0; String wauxTime = "00:00"; String[] fields1; Duration d1 = null; Duration d2 = null; for (int i = 1; i <= 10; i++) { Result1 = r.nextInt(High1 - Low1) + Low1; Result2 = r.nextInt(High2 - Low2) + Low2; wauxTime = myformatTime.format(Result1)+":"+myformatTime.format(Result2); fields1 = wauxTime.split(":"); d1 = Duration.parse(String.format("P%dM%sS", fields1[0], fields1[1])); // d3 = d1.plus(d2); System.out.println(d1.toString()); } } }