if ( addr == null ) {
            throw new IllegalArgumentException();
        }
        this.addr = addr;
    }


    /**
     * Return the IP address of this address as a 32 bit integer.
     */

    @Override
    public int hashCode () {
        return this.addr.hashCode();
    }


    /**
     * Compare two addresses for equality. Two <tt>UniAddress</tt>s are equal

        if( addr == null ) {
            throw new IllegalArgumentException();
        }
        this.addr = addr;
    }

    /**
     * Return the IP address of this address as a 32 bit integer.
     */

    public int hashCode() {
        return addr.hashCode();
    }

    /**
     * Compare two addresses for equality. Two <tt>UniAddress</tt>s are equal