classes, clock class, Exercise 01 slide 46

package class170706;

/*
 *Clock class
 *
 *Classes, Exercise 01, slide 46
 */

public class Clock {
    // properties
    private int hours; // hours : 0 to 23
    private int minutes; // minutes : 0 to 59
    private int seconds; // seconds : 0 to 59

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

    // set hours property
    // return true on success, false otherwise
    public boolean setHours(int hours) {
        // if invalid argument
        if (hours < 0 || hours > 23) {
            // do nothing and return false
            return false;
        }

        // update hours and return true for success
        this.hours = hours;
        return true;
    }

    // return minutes property
    public int getMinutes() {
        return minutes;
    }

    // set minutes property
    // return true on success, false otherwise
    public boolean setMinutes(int minutes) {
        // if invalid argument
        if (minutes < 0 || minutes > 59) {
            // do nothing and return false
            return false;
        }

        // update minutes and return true for success
        this.minutes = minutes;
        return true;
    }

    // return seconds property
    public int getSeconds() {
        return seconds;
    }

    // set seconds property
    // return true on success, false otherwise
    public boolean setSeconds(int seconds) {
        // if invalid argument
        if (seconds < 0 || seconds > 59) {
            // do nothing and return false
            return false;
        }

        // update seconds and return true for success
        this.seconds = seconds;
        return true;
    }

    // increase the time by one second
    public void tick() {
        this.seconds += 1;

        if (this.seconds == 60) {
            this.seconds = 0;
            this.minutes += 1;

            if (this.minutes == 60) {
                this.minutes = 0;
                this.hours += 1;

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

    // print a the clock on the screen as hh:mm:ss
    public void show() {
        System.out.printf("%02d:%02d:%02d", this.hours, this.minutes,
                this.seconds);
    }

    // reset the clock to 00:00:00
    public void reset() {
        this.hours = this.minutes = this.seconds = 0;
    }

    @Override
    public String toString() {
        return String.format("%02d:%02d:%02d", this.hours, this.minutes,
                this.seconds);
    }
}