trying to call a class in another class

Question

nici0306 0 Newbie Poster

14 Years Ago

I have three classes in the program. This is a part of my assignment. I am doing it for the first time; so you might find something stupid in there.. as i have just tried to get the output my way or based on the assignment requirements. I have one main class and two other class. It is a pretend mail client.

1. Main class - does work of getting the input and storing in the message class.
2. message class - stores and returns the data
3. sendmail class - it is meant to get the stored data in message class and write it in the file.

Now the problem:
I can get stored data in the main class but not in sendmail class.. It writes the value of the data as NULL.

import java.io.*;
import java.io.FileWriter;
import java.util.Scanner;
public class MyPMC_B {

	public static void main(String[] args) 
	{
	// TODO Auto-generated method stub
		String from = "";
		String to = "";
		String subject = "";
		String emailText = "";

		Scanner scanner = new Scanner(System.in);
		Message m = new Message();

		//System.out.println("HELO mail.swin.edu.au");

		if (args.length == 0)
			{
				System.out.print("From: ");
				from = scanner.nextLine();
				m.setFrom(from);

				System.out.print("To: ");
				to = scanner.nextLine();
			        m.setTo(to);

				System.out.print("Subject: ");
				subject = scanner.nextLine();
				m.setSubject(subject);

				System.out.print("Body: ");
				emailText = scanner.nextLine();
				m.setEmailtext(emailText);
			}
		else
			{
				for (int i = 0; i < args.length; i++)
					{
						if (args[i].toLowerCase().startsWith("from:"))
						{
						from = args[i];
		            			from = from.substring(5);
						m.setFrom(from);
						}
					}
				if ( from.isEmpty())
					{
						System.out.print("From: ");
						from = scanner.nextLine();
						m.setFrom(from);
					}
				for (int i = 0; i < args.length; i++)
					{
						if(args[i].toLowerCase().startsWith("to:"))
						{
							to = args[i];
							to = to.substring(3);
							m.setTo(to);
						}		
						else if(args[i].toLowerCase().startsWith("subject"))
						{
						subject = args[i];
						subject = subject.substring(8);
						m.setSubject(subject);
						}
						else if(args[i].toLowerCase().startsWith("body"))
						{ 
						for (int j = i; j < args.length; j++)
								{
									emailText += args[j]+ " ";
								}
							m.setEmailtext(emailText);
							break;
						}
					}
				if ( to.isEmpty())
					{
						System.out.print("To: ");
						to = scanner.nextLine();
						m.setTo(to);
					}
				if ( subject.isEmpty())
					{
						System.out.print("Subject: ");
						subject = scanner.nextLine();
						m.setSubject(subject);
					}

				if ( emailText.isEmpty())
					{
						System.out.print("Body: ");
						emailText = scanner.nextLine();
						m.setEmailtext(emailText);
					}
			}

	//getting the SMTP server from the FROM address

	String [] fromadd = from.split("@");
	String ServerName = fromadd[1];
	m.setServer(ServerName);
	SendMail sm = new SendMail();
	sm.mail();

	String test = m.getTo();
	System.out.println(test);

	if (sm.mail()==0)
		{
		System.out.println("The mail was unsuccessful, check the logs");
		}
	else
		{
		System.out.println("The mail was sent successfully");
		}

	System.out.print("Do you want to send another email? (yes/no): ");
	String ans = scanner.nextLine();
	int n;
	if (ans.toLowerCase().startsWith("y"))

		{
		n = 1;
		}

	for (n = 0; n <= 1; n++)
		{
		  		System.out.print("From: ");
				from = scanner.nextLine();
				m.setFrom(from);

				System.out.print("To: ");
				to = scanner.nextLine();
				m.setTo(to);

				System.out.print("Subject: ");
				subject = scanner.nextLine();
				m.setSubject(subject);

				System.out.print("Body: ");
				emailText = scanner.nextLine();
				m.setEmailtext(emailText);

				String [] fromadd1 = from.split("@");
				ServerName = fromadd[1];
				m.setServer(ServerName);
				SendMail sm1 = new SendMail();
				sm1.mail();

				if (sm.mail()==0)
					{
						System.out.println("The mail was unsuccessful, check the logs");
					}
				else
					{
						System.out.println("The mail was sent successfully");
					}
				System.out.print("Do you want to send another email? (yes/no): ");
				ans = scanner.nextLine();
				if (ans.toLowerCase().startsWith("y"))
					{
					n = 1;
					}
				else
					{
					n = 3;
					}
		}
	}

public static class Message 
     {
	public String from1;
	public String to1;
	public String subject1;
	public String emailText1;
	public String server;

	public void setFrom(String f)
   		{ 
         		from1 = f;
		}

	public String getFrom()
		{
			return from1;
		}

	public void setTo(String t)
    		{
      			to1 = t;
		}

	public String getTo()
		{
			return to1;
		}

	public void setSubject(String s)
    		{
      			subject1 = s;
		}

	public String getSubject()
		{
			return subject1;
		}

	public void setEmailtext(String e)
    		{
      			emailText1 = e;
		}

	public String getEmailtext()

		{
			return emailText1;
		}

	public void setServer(String n)

		{
			server = n;
		}

	public String getServer()

		{
			return server;
		}
    }

public static class SendMail

      {
	Message n = new Message();
	String from = n.getFrom();
	String to = n.getTo();
	String subject = n.getSubject();
	String emailText = n.getEmailtext();
	String Servername = n.getServer();
	int result;

	public int mail()
		{
			try 
				{
					FileWriter fw = new FileWriter("c:\\smtp.txt",true);
					// the true parameter in the constructor is for append mode
					//  \r\n are for end of line
		  			fw.write("HELO "+Servername+"\r\n");
		  			fw.write("MAIL FROM: " +from+"\r\n");
					fw.write("MAIL TO: " +to+"\r\n");
					fw.write("DATA\r\n");
					fw.write("Subject: " +subject+"\r\n");
					fw.write(emailText+"\r\n\n");
		  			fw.close();
					result = 1;
					return result;
				}

			catch (IOException e) 
				{
					e.printStackTrace();
					result = 0;
					return result;
				}
	}      
 }
}

I know it is long one to go through.. but any help would be highly appreciated.

java

Edited 14 Years Ago by nici0306 because: fixing the spacing in the code

2 Contributors
4 Replies
166 Views
8 Hours Discussion Span
Latest Post 14 Years Ago Latest Post by nici0306

cale.macdonald 4 Junior Poster

14 Years Ago

public static class SendMail
{
    String from, to, subject, emailText, serverName;
    public SendMail(Message message)
    {
        from = message.getFrom();
        to = message.getTo();
        ....
    }
    ...     
 }

nici0306 commented: fixed my issue.. thanks very much +0

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cale.macdonald 4 Junior Poster · Answer 1 · 2010-04-15T07:32:03+00:00

Your problem is in the send mail class. You create a new mail message and then try and get the values from it. Since none of the values have been initialized, you will get their (String) default values (null).

I would recommend creating a constructor that takes in a MailMessage and then use that instead of creating a new one. That should fix your problem.

Cheers

nici0306 0 Newbie Poster · Answer 2 · 2010-04-15T07:43:56+00:00

Your problem is in the send mail class. You create a new mail message and then try and get the values from it. Since none of the values have been initialized, you will get their (String) default values (null).
I would recommend creating a constructor that takes in a MailMessage and then use that instead of creating a new one. That should fix your problem.
Cheers

Not sure if i understood your suggestion. I will try to read it again and try to understand.. :)

nici0306 0 Newbie Poster · Answer 3 · 2010-04-15T08:43:52+00:00

public static class SendMail
{
    String from, to, subject, emailText, serverName;
    public SendMail(Message message)
    {
        from = message.getFrom();
        to = message.getTo();
        ....
    }
    ...     
 }

THANK YOU sooooo much.. That fixed it :)