Thread: Regarding equating objects in Java

PrintWriter pw = response.getWriter();

What actually we are doing here ?

How can a object of PrintWriter class can be equated to a method called by response object of HttpServletResponse class ?

Also I do not understand how different objects of different class are equated to each other ?

For Example,

import java.sql.*

public class JDBCSample {

public static void main( String args[]) {

String connectionURL = "jdbc:postgresql://localhost:5432/movies;user=java;password=samples";
// Change the connection string according to your db, ip, username and password

try {

// Load the Driver class.
Class.forName("org.postgresql.Driver");
// If you are using any other database then load the right driver here.

//Create the connection using the static getConnection method
Connection con = DriverManager.getConnection (connectionURL);
//Create a Statement class to execute the SQL statement
Statement stmt = con.createStatement();

//Execute the SQL statement and get the results in a Resultset
ResultSet rs = stmd.executeQuery("select moviename, releasedate from movies");

// Iterate through the ResultSet, displaying two values
// for each row using the getString method

while (rs.next())
System.out.println("Name= " + rs.getString("moviename") + " Date= " + rs.getString("releasedate");
}
catch (SQLException e) {
e.printStackTrace();
}
catch (Exception e) {
e.printStackTrace();
}
finally {
// Close the connection
con.close();
}
}
}

I have highlighted the problematic statement.