DAO and DTO

DTO is an abbreviation for Data “Transfer” Object.

<ul><li>It is used to transfer the data between classes and modules of your application, typically with data/values from database. DTO should only contain private fields for your data, getters, setters and constructors. It is not recommended to add any logic methods to such classes.</li></ul>

DAO is an abbreviation for Data “Access” Object.

<ul><li>It should have the logic for retrieving, saving and updating data in your database.</li></ul><div>
</div><div>Business Object is the class that uses DAO and DTO. Consider this is our servlet. It also has all logics (methods to do stuff etc).
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Here is an example how the DAO and DTO interfaces would look like:

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