Is it safe to mix aptitude with apt-get ?

[listofx]

> xiang at xiang-laptop:~$ sudo aptitude -f install 
> [sudo] password for xiang: 
> Reading package lists... Done
> Building dependency tree       
> Reading state information... Done
> Reading extended state information      
> Initialising package states... Done
> The following packages are BROKEN:
>   openjdk-6-jdk 
> The following NEW packages will be installed:
>   clamav clamav-base clamav-freshclam libclamav6 libnunit-doc libtommath0 nunit nunit-console nunit-gui 

Those packages above have been removed through apt-get. (I rather prefer
apt-get --purge autoremove pkgs.)

> The following packages will be REMOVED:
>   libqt4-mendeley-dbus{p} libqt4-mendeley-designer{p} libqt4-mendeley-network{p} libqt4-mendeley-qt3support{p} 
>   libqt4-mendeley-script{p} libqt4-mendeley-sql{p} libqt4-mendeley-sql-sqlite{p} libqt4-mendeley-svg{p} 
>   libqt4-mendeley-webkit{p} libqt4-mendeley-xml{p} libqt4-mendeley-xmlpatterns{p} libqtcore4-mendeley{p} 
>   libqtgui4-mendeley{p} linux-headers-2.6.32-23{p} linux-headers-2.6.32-23-generic{p} linux-image-2.6.32-23-generic{p} 
>   mendeleydesktop{p} qt4-mendeley-qtconfig{p} 

mendeley was installed through apt-get

> 1 packages upgraded, 9 newly installed, 18 to remove and 13 not upgraded.
> Need to get 11.9MB/16.5MB of archives. After unpacking 280MB will be freed.
> The following packages have unmet dependencies:
>   openjdk-6-jdk: Depends: openjdk-6-jre (>= 6b18-1.8-4ubuntu3) but 6b18-1.8-0ubuntu1 is installed and it is kept back.
> The following actions will resolve these dependencies:
> 
> Keep the following packages at their current version:
> openjdk-6-jdk [6b18-1.8-0ubuntu1 (lucid, now)]
> 
> Score is 60
> 
> Accept this solution? [Y/n/q/?] ^C

So, the solution is absolutely wrong for me. but how to fix the wrong package state information in aptitude?
Or
It is not safe to use both aptitude and apt-get, right?
> 
> xiang at xiang-laptop:~$ sudo apt-get -f install 
> Reading package lists... Done
> Building dependency tree       
> Reading state information... Done
> 0 upgraded, 0 newly installed, 0 to remove and 14 not upgraded.
>