public class Length {

    private double cm;

    /**
     * Setter method for centimeters.
     * @param cm The new length in centimeters.
     */
    public void setCentimeters(double cm) {
        this.cm = cm;
    }

    /**
     * Getter method for centimeters.
     * @return The current length in centimeters.
     */
    public double getCentimeters() {
        return this.cm;
    }

    // First the conversion factor: to declare a field static means that it is
    // shared between all objects of this class, and to declare it final means
    // that it is a "named constant" whose value cannot be changed later. You
    // should prefer named constants to "magic numbers" hardwired in code.
    private static final double CM_PER_INCH = 2.54;

    /**
     * Setter method for inches.
     * @param inches The new length in inches.
     */
    public void setInches(double inches) {
        // Compute the length in inches
        this.cm = inches * CM_PER_INCH;
    }

    /**
     * Getter method for inches.
     * @return The current length in inches.
     */
    public double getInches() {
        return this.cm / CM_PER_INCH;
    }

    /**
     * The String representation of this Length object.
     * @return The length stored in this object in centimeters.
     */
    public String toString() {
        return this.cm + " cm";
    }
}