Can not access the public schema

Hi,
I had installed postgresql-8.1.9, But when I tried to run any sql statement like the following:
(1)select * from <TableName>;
or
(2)select * from public.<TableName>;

on the query tool to access any table inside the public schema I got the following error:
ERROR: relation "<TableName>" does not exist
or
ERROR: relation "public.<TableName>" does not exist
thought I am logging in with a superuser account.

-The second part of the problem is that I wrote a JDBC code to access any table inside the public schema and I got the same errors.And the following are the lines of code I wrote:

Class.forName("org.postgresql.Driver");
Connection connection = DriverManager.getConnection("jdbc:postgresql://localhost/<DataBaseName>?user=user&password=password");
System.out.println("connection>>>>>>>>>>>>> "+connection);
Statement statement=connection.createStatement();
ResultSet resultSet=statement.executeQuery("select * from public.<TableName>");
//or
//select * from <TableName>
while(resultSet.next()){
System.out.println(resultSet.getString(1));
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}

-I ensured that I have a connection to the DataBase by printing the connection to the console as you see.And the connection object was printed.

-Please advice.

Thanks,
Mohamed.

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