Clock

/////////////////MAIN CLASS ////////////////////////
public class ClockView {
    public static void main(String[] args) {
        Clock clock = new Clock();
        clock.setHours(5);
        clock.setMinutes(4);
        clock.setSeconds(4);
        clock.show();
        clock.tick();
        clock.tick();
        clock.show();
        clock.reset();
        clock.show();
    }
}

///////////////////// Clock Class ////////////////////////
public class Clock {

    // Variables declaration
    private int hours, minutes, seconds;

    // Methods
    public int getHours() {
        return hours;
    }

    public int getMinutes() {
        return minutes;
    }

    public int getSeconds() {
        return seconds;
    }

    public boolean setHours(int h) {
        if(h < 0 || h > 23) {
            hours = 0;
            System.out.println("Hours should be between 0 and 59!");
            return false;
        }
        hours = h;
        return true;
    }

    public boolean setMinutes(int m) {
        if(m < 0 || m > 59) {
            minutes = 0;
            System.out.println("Minutes should be between 0 and 59!");
            return false;
        }
        minutes = m;
        return true;
    }

    public boolean setSeconds(int s) {
        if(s < 0 || s > 59) {
            seconds = 0;
            System.out.println("Seconds should be between 0 and 59!");
            return false;
        }
        seconds = s;
        return true;
    }

    public void tick() {
        seconds += 1;
        minutes += seconds / 60;
        hours += minutes / 60;
        seconds %= 60;
        minutes %= 60;
        hours %= 24;
    }

    public void show() {
        printElement(hours);
        printElement(minutes);
        if(seconds < 10) {
            System.out.print("0");
        }
        System.out.println(seconds);
    }

    public void reset() {
        hours = minutes = seconds = 0;
    }

    private void printElement(int n) {
        if(n < 10) {
            System.out.print("0");
        }
        System.out.print(n + ":");
    }
}