What exactly is happening here

Question

Statement st = con.createStatement();
Con is object of connection interface and calling create statement method. Does create statement method belongs to connection class? And what is it passing to statement st? Is it passing a reference or value?

Answer 1

Sagar Gupta you're welcome.
Nice to know it helped.

Answer 2

The connection interface is similar to a factory and it's reference can be used to get objects of statement or preparedStatement.

con is a reference and not an object because you cannot instantiate an interface so you use that reference to create an object of Statement class.

createStatement() -> creates statement object for sending SQL statements to the database.

https://docs.oracle.com/javase/7/docs/api/java/sql/Connection.html

Answer 3

Avinesh very well explained thank you brother