Clock Assignment

public class Clock {
	// Fields of the class
	int hours;
	int minutes;

	// Default constructor
	Clock() {
		this.hours = 0;
		this.minutes = 0;
	}

	// Constructor with 1 argument
	Clock(int h) {
		setTime(h, 0);
	}

	// Constructor with 2 argument
	Clock(int h, int m) {
		setTime(h, m);
	}

	// Instance methods
	int getHour() {
		return this.hours;
	}

	int getMinute() {
		return this.minutes;
	}

	void incrementTimer() {
		if (this.minutes < 59) {
			this.minutes += 1;
		}
		else {
			this.minutes += 1;
			this.hours += 1;
			this.minutes = 0;
		}

	}

	void incrementTimer(int x) {
		for (int i = 0; i < x; i++) {
			incrementTimer();
		}
	}

	void setTime(int h, int m) {
		if ((h >= 0 && h <= 24) && (m >= 0 && m <= 59)) {
			this.hours = h;
			this.minutes = m;
		}
		else if ((h > 24 || m > 60)||(h > 24 && m > 60)) {
			System.out.println("Invalid Input");
		}
	}

	public String toString() {
		String hs = String.valueOf(hours);
		String ms = String.valueOf(minutes);
		String time = "";
		String sm = ":";

		if(hs.length() == 1) {
			hs = "12";
		}
		if(hs.length() == 1) {
			hs = "0" + hs;

		}
		if(minutes <= 9) {
			ms = "0" + ms;
		}
		if(hours < 12) {
			time = " AM";
		}
		else {
			time = " PM";
		}
		if(hours > 12 && hours < 21) {
			hs = "0"+ String.valueOf(hours-12);
		}
		else if (hours > 24){
			hs = String.valueOf(hours-12);

		}
		return hs + sm + ms + time;
	}

}