function readOnly(count){ }
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Below is the query.
SELECT count() FROM ApexClass
Mark this as best answer if this resolves your query.
Regards
Sampath
As Sampath said you can write above query in Workbench or Data loader to retrieve all the classes.
There are in-built system tables where you can retrieve, Classes, Triggers...etc
Apart from writing the query, there is a Google Chrome plug-in which will be very helpful for you.
https://chrome.google.com/webstore/detail/salesforce-advanced-resou/hgghifjinbelollgliobhggnlhkaaeec?hl=en
It is a plug-in to the chrome and very helpful for any developer.
Please let me know if this helps you.
Regards,
Mahesh