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Thread: Regarding equating objects in Java

  1. #1
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    Default 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.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Regarding equating objects in Java

    PrintWriter pw = response.getWriter();

    What actually we are doing here ?
    The getWriter() method returns a reference to a PrinteWriter object that is assigned to the pw variable.

    how different objects of different class are equated to each other ?
    Read the API doc for the method to see what it returns.
    If you don't understand my answer, don't ignore it, ask a question.

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