public class Time {

    int hr;
    int min;
    int sec;

    Time() {
        // initializing to zero
        hr = 0;
        min = 0;
        sec = 0;
    }

    Time(int hour, int minute, int second) {
        hr = hour;
        min = minute;
        sec = second;
    }

    public void display() {
        System.out.printf(
            "%02d:%02d:%02d\n",
            (hr % 24),
            (min % 60),
            (sec % 60)
        );
    }

    public void add(Time t1, Time t2) {
        int totalSeconds =
            (t1.hr * 3600) +
            (t2.hr * 3600) +
            (t1.min * 60) +
            (t2.min * 60) +
            (t1.sec) +
            (t2.sec);
        this.hr = totalSeconds / 3600;
        this.min = (totalSeconds % 3600) / 60;
        this.sec = (totalSeconds % 60);
    }

    public static void main(String[] args) {
        Time t1 = new Time(13, 30, 0);
        Time t2 = new Time(05, 45, 00);

        System.out.print("Time T1 is: ");
        t1.display();
        System.out.print("Time T2 is: ");
        t2.display();

        Time sum = new Time();

        sum.add(t1, t2);
        System.out.print("The sum is: ");
        sum.display();
    }
}