error: cannot find symbol PreparedStatement st = conn.prepareStatement("SELECT * FROM table WHERE name = ?");
symbol: variable conn
location: class splitString

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

class splitString{
public static void main(String[] args){

//Connect to database
    try
    {
       Class.forName("org.postgresql.Driver");
       Connection con=DriverManager.getConnection("jdbc:postgresql://localhost/database", "postgres", "pswd");
       if(con != null)
           System.out.println("Connection Successful!");
    }
    catch(Exception ee)
    {
        ee.printStackTrace();
    }

    String word = "Apples";
    PreparedStatement st = conn.prepareStatement("SELECT * FROM table WHERE name = ?");
    st.setString(1, word);
    ResultSet rs = st.executeQuery();

  }
}