public class Stapler {
	// class constants
	private final static int MAX_NUMBER_STAPLES = 100;
	
	// object attributes
	private int numberStaplesLeft = 0;
	
	// Stapler(): default constructor
	public Stapler() {
		this(0);
	}
	
	// Stapler(): specific constructor
	public Stapler(int n) {
		this.setNumberStaples(n);
	}

	public void setNumberStaples(int n) {
		this.numberStaplesLeft = n;
	}

	// empty(): remove all staples from the stapler
	public void empty() {
		this.setNumberStaples(0);
	}
	
	// punch(): use up a stapler
	public void punch() {
		this.removeStaples(1);
	}
	
	// numberLeft(): report the number of staples in the Stapler
	public int getNumberStaples() {
		return this.numberStaplesLeft;
	}
	
	// toString(): produce a representation of the state of the Stapler
	public String toString() {
		String result = "Stapler: [ " + this.getNumberStaples() + " ]";
		return result;
	}
	
	// refill(): fully load stapler
	public void fill() {
		this.setNumberStaples(Stapler.MAX_NUMBER_STAPLES);
	}
	
	public void addStaples(int increment) {
		int n = this.getNumberStaples();
		
		this.setNumberStaples(n + increment);
	}
	
	public void removeStaples(int decrement) {
		int n = this.getNumberStaples();
		
		this.setNumberStaples(n - decrement);
	}
	
	public Object clone() {
		int n = this.getNumberStaples();
		
		Stapler duplicate = new Stapler(n);
		
		return duplicate;
	}
	
	public void takeStaples(Stapler s) {
		int n1 = this.getNumberStaples();
		int n2 = s.getNumberStaples();
		
		int total = n1 + n2;
		
		n1 = Math.min(this.MAX_NUMBER_STAPLES, total);
		
		n2 = total - n1;
		
		this.setNumberStaples(n1);
		
		s.setNumberStaples(n2);
	}

}