JavaBasics Exam 1. Timespan

import java.util.Scanner;

public class _1_Timespan {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String inputStart = scan.nextLine().trim();
        String inputEnd = scan.nextLine().trim();

        int[] startTimes = readInputLineAndConvertStringToIntegerNums(inputStart);
        int[] endTimes = readInputLineAndConvertStringToIntegerNums(inputEnd);

        int outSec = startTimes[2] - endTimes[2];
        if (outSec < 0) {
            startTimes[1]--;
            outSec += 60;
        }

        int outMin = startTimes[1] - endTimes[1];
        if (outMin < 0) {
            startTimes[0]--;
            outMin += 60;
        }

        int outHour = startTimes[0] - endTimes[0];

        System.out.printf("%d:%02d:%02d%n", outHour, outMin, outSec);
    }

    private static int[] readInputLineAndConvertStringToIntegerNums(
            String inputLine) {
        String[] inputs = inputLine.split(":");
        int[] nums = new int[inputs.length];
        for (int i = 0; i < nums.length; i++) {
            nums[i] = Integer.parseInt(inputs[i]);
        }

        return nums;
    }

}