Q) Example program on a method writing interface type as return type

A)

interface connection

{

      

}

class OracleConnection implements connection

{

      

}

class JdbcOdbcConnection implements connection

{

      

}

class DriverManager

{

       static connection getConnection()

       {

              connection con=newJdbcOdbcConnection();

              //connection con= new OracleConnection();

              return con;

       }

}

class test2 {

       public static void main(String[] args) {

              connection con= DriverManager.getConnection();

              System.out.println(con.getClass().getName());

       }

}

Output:

JdbcOdbcConnection