Time + 15 Minutes [Java]

import java.util.Scanner;

public class TimePlus15Minutes {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int hour = Integer.parseInt(scanner.nextLine());
        int minutes = Integer.parseInt(scanner.nextLine());

        int allMinutes = hour * 60 + minutes + 15;
        int hours = allMinutes / 60;
        int newMinutes = allMinutes % 60;

        if (hours == 24) {
            hours = 0;
        }

        if (newMinutes < 10) {
            System.out.printf("%d:%02d%n", hours, newMinutes);
        } else {
            System.out.printf("%d:%d%n", hours, newMinutes);
        }
    }
}