@Override
    public boolean equals(Object obj) {
	if (this == obj) {
	    return true;
	}
	if (obj == null) {
	    return false;
	}
	if (getClass() != obj.getClass()) {
	    return false;
	}
	Grade other = (Grade) obj;
	if (this.eugrade != other.eugrade) {
	    return false;
	}
	if (this.usgrade != other.usgrade) {
	    return false;
	}
	return true;
    }