Where is the getString() implementation for RS and Object class question

Dear all,
I had these two questions ringing since a long time.
1)ResultSet is an interface.
In my jdbc code I have generally written rs.getString() and rs.getInt etc.. without giving a second thought as to where exactly is this getter implemented !
I have RTF API .. without too much help.
Could some one kindly explain Where is the implementation of the getString method ?
2) Could you please tell why the Wait() Notify() and NotifyAll methods have been implemented in the Object class ? What was the need to define em in the Object class ?
Thanks in advance for your time spent on this.
Rgds

Sarvananda wrote:
In the MySQL driver for example it's implemented in com.mysql.jdbc.ResultSet Right. Now it makes sense to me. Every single db that gives me a driver will have their specific implementation for the interface methods of ResultSet.
>
why do you need that?
..Thats a design decision
One of my friends asked me this and I was caught unawares. Any ideas on what factors could have made this design decision ?
Rgds
>
In the MySQL driver for example it's implemented in com.mysql.jdbc.ResultSet Right. Now it makes sense to me. Every single db that gives me a driver will have their specific implementation for the interface methods of ResultSet.
>
why do you need that?
..Thats a design decision
One of my friends asked me this and I was caught unawares. Any ideas on what factors could have made this design decision ?
A desire to not have to couple your code to a particular database and JDBC driver. It's a classic example of the abstract factory pattern

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Revision: 12827
Revision: 12827
Author:   [email protected]
Date:     2009-12-10 19:03:29 -0800 (Thu, 10 Dec 2009)
Log Message:
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Where is the getString() implementation for RS and Object class question

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