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Thread: Taking info from a text file, sorting it, save into class arrays and reprinting into new txt file

  1. #1
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    Default Taking info from a text file, sorting it, save into class arrays and reprinting into new txt file

    I'm supposed to write a program in Java . I'm given a text file containing

    I am Hakan. My email address is hakan@cs.uh.edu, and what is your name? Hi my name is Tarikul and my favorite email address is tarikul2000@cs.uh.edu

    and im suppossed to take tarikul2000@uh.edu and hakan@cs.uh.edu and organize them acording to whether or not they have a subdomain(the "cs" part there other possibilities) or not and store it into class arrays of type Email and UniversityEmail. I'm to then take a user iput of 0-7 and depending on the input print out a different set of info I've created the classes and but i dont know how i can take the info then sort it. The possible subdomains are 1.art 2. chee 3. chem 4. coe 5. cs 6. egr 7. polsci

    this is what i have so far if anyone can help me move foward I appreciate it
    import java.io.* ;
    import java.util.HashSet;
    import java.util.Scanner;
    import java.io.PrintWriter;
    import java.io.FileOutputStream;
    import java.util.regex.Pattern;
    import java.util.regex.Matcher;
     
     
    public class Try {
    	public static void main(String[] args) {		 
    		Email [] storage;// email is a class that was made to store the data
    		storage = new Email [99];
    		UniversityEmail[] save;
    		save= new UniversityEmail[99];
     
    		HashSet<String> hs = new HashSet<>();
    		Scanner input= null;
    		PrintWriter output= null;
    		try {
    			input= new Scanner("inputemails.txt");
    			output= new PrintWriter("outputemails.txt");
     
    			}
     
    		 catch (FileNotFoundException e) {
    			System.out.print("File not found");
    			System.exit(0);}
    		String line = null;
     
    		while(input.hasNextLine())
    		{
    		fillEmailsHashSet(line, hs);
    		}
     
     
     
     
    		input.close();
    		output.close();
    	}
     
     
    public static void fillEmailsHashSet(String line,HashSet<String> container){
        Pattern p = Pattern.compile("([\\w\\-]([\\.\\w])+[\\w]+@([\\w\\-]+\\.)+[A-Za-z]{2,4})");
        Matcher m = p.matcher(line);
     
        while(m.find()) {
            container.add(m.group(1));
        }
     
    }}

    The Email and UniversityEmail are in seperate code chunks i can post if it helps


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    Default Re: Taking info from a text file, sorting it, save into class arrays and reprinting into new txt file

    I'm going to venture a guess that both Email and UniversityEmail have a String variable containing the email. If so then it is a matter of iterating through each element in the UniversityEmail array and checking the aforementioned String variable for a subdomain, based on user input, and then output whatever matches. Another guess here is that if 0-7 is pressed you will output all emails that correspond to the subdomain, or lack there of, associated with the number. Seeing the other classes could help a bit and also I don't see any code for taking user input (is that an issue in itself). Hope some of that helps.

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    Default Re: Taking info from a text file, sorting it, save into class arrays and reprinting into new txt file

    taking user input isnt a problem i jus have gotten around to it yet, i was more concerned with sorting info

    here is the Email class
    public class Email {
     
    	public String username;
    	public String email1;
    	public String extension;
    	public Email()
    	{
    		//default construntor
     
    	}
     
    	public Email(String U, String Em , String Ex)
    	{
    		username =U;
    		email1= Em;
    		extension=Ex;
     
    	}
    	public void print()
    	{
     
    	}
    }
    and here is the UniversityEmail
    public class UniversityEmail extends Email {
     
    	public String department;
    	public int code;
    	public UniversityEmail()
    	{//default constructor 
    	}
    	public UniversityEmail(String U, String Em , String Ex
    			, String Dep,int C)
    	{super( U, Em , Ex);
    	department= Dep;
    	code=C;
     
    	}
    	public void print()
    	{
     
    	}
     
    }

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    Default Re: Taking info from a text file, sorting it, save into class arrays and reprinting into new txt file

    This may seem like a dumb question but I want to be certain. By "sort" are you referring to adding the email to either the Email/UniveristyEmail array or actually sorting those arrays, perhaps by subdomain/alphabetically?
    At any rate for the first possibility, take this sudo code:
    while(check input text for next line)
        {
            if next line of input contains art, chee, chem...etc then
                extract required info
                add new UniversityEmail to UniversityEmail array
            else if it only has something like the @ symbol then
                extract required info
                add new Email to Email array
        }
    As for the second possibility, where you sort by subdomain/alphabetically you would still do the above then manipulate the arrays as needed.

    One thing you haven't mentioned is whether or not your code successfully parses the email addresses from the input.

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    Default Re: Taking info from a text file, sorting it, save into class arrays and reprinting into new txt file

    if anyone can help me move foward I appreciate it . . . taking user input isnt a problem i jus have gotten around to it yet
    Volunteers invest their time freely (as in free beer and freedom) to do their best to help you based on what you tell us and in response to the specific questions you ask. Please make the best use of the time invested to help you by asking specific questions, and please don't turn away or trivialize the help you are offered.

    --- Update ---

    if anyone can help me move foward I appreciate it . . . taking user input isnt a problem i jus have gotten around to it yet
    Volunteers invest their time freely (as in free beer and freedom) to do their best to help you based on what you tell us and in response to the specific questions you ask. Please make the best use of the time invested to help you by asking specific questions, and please don't turn away or trivialize the help you are offered.

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    Default Re: Taking info from a text file, sorting it, save into class arrays and reprinting into new txt file

    By sort i do mean jus puting the info in the appropriate arrays and yes the code for it to print out is

    for (String string : hs) {
    System.out.println(string);

    i had taken it out cause it wasnt part of what i need to turn in

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    Default Re: Taking info from a text file, sorting it, save into class arrays and reprinting into new txt file

    Ok so like the sudo code suggest loop through the input, text file in this case, then parse out the email, check if it contains a subdomain (or not) and place it in the respective array. Once you have given that a shot post the code that you have tried and any problems with it or let us know if all is well.

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    Default Re: Taking info from a text file, sorting it, save into class arrays and reprinting into new txt file

    so ive looked around the web for a way to check the string line and i got
    	while(input.hasNextLine())
    		{
    		fillEmailsHashSet(line, hs);
    		if(input.contains("art"))
    			{emails[i]=hs.toArray(new String[hs.size()]);
    			}
    		if(input.contains("chee"))
    		if(input.contains("coe"))
    		if(input.contains("cs"))
    		if(input.contains("egr"))
    		if(input.contains("polsci"))
    		i++;
     
    		}
    but i get two errors first that in the input.contains and input.matches
    "The method contains(String) is undefined for the type Scanner"
    and the second is
    Type mismatch: cannot convert from String[] to String
    at
    {emails[i]=hs.toArray(new String[hs.size()]);}
    any idea how to fix this?

    also i discovered i dont need to put the emails into arrays of class types but store the class objects in an array

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