What is a PreparedStatement implementation?

Question

Java

The PreparedStatement interface inherits from the Statement interface, but what is their implementation? Even in the oracle docs, as elsewhere it is written that this interface creates an object, but the interface object cannot be created, the implementation object must be created. Please explain this point.

Answer 1

The implementation provides a database-specific JDBC driver. PostgreSQL example
This is done in order not to be dependent on a specific database driver. If you change the driver to another (for example, change the database), then when using interfaces, your code will not change at all.