public class PencilB {
    private int defaultColor = 0;
    private int color; /*one of 0,1,2 for "black", "red", or "blue"*/
    private int length;

    private boolean isValid (String colorToCheck) {
	return (colorToCheck.equals("black") ||
		colorToCheck.equals("red")   ||
		colorToCheck.equals("blue")    );
    }

    private int encode (String c) {
	int result;
	if (c.equals("black")) {
	    result = 0;
	}
	else if (c.equals("red")) {
	    result = 1;
	}
	else if (c.equals("blue")) {
	    result = 2;
	}
	else {
	    result = 3; //this code should never execute
	}
	return result;
    }

    private String decode (int c) {
	String result;
	switch (c) {
	case (0):
	    result = "black";
	    break;
	case (1):
	    result = "red";
	    break;
	case (2):
	    result = "blue";
	    break;
	default:
	    result = "error"; //this code should never execute
	}
	return result;
    }

    public PencilB (String c, int l) {
	if (isValid(c)) {
	    color = encode(c);
	}
	else {
	    color = defaultColor;
	}
	length = l;
    }

    public String toString () {
	return (length + ": " + decode(color));
    }

    public void setColor (String newColor) {
	if (isValid(newColor)) {
	    color = encode(newColor);
	}
    }
}