Review

class IntRange {
    /**
     * <p>Compares this range to another object to test if they are equal.</p>.
     * 
     * <p>To be equal, the class, minimum and maximum must be equal.</p>
     *
     * @param obj the reference object with which to compare
     * @return <code>true</code> if this object is equal
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (obj instanceof IntRange == false) {
            return false;
        }
        IntRange range = (IntRange) obj;
        return min == range.min && max == range.max;
    }

}