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Thread: Reading CSV File

  1. #1
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    Default Reading CSV File

    I have a CSV file with 16K entries of a data table.

    Does Java work well with CSV file? Sorry I am a complete noob

    --- Update ---



    Okay, so I found this code. And it seems its quite easy to read in the data I need. Say for example if I wanted a loop to randomly pick the first field of a specific line in the CSV data table. How would i go about coding that??????

    package cvs.test;
     
    import java.io.BufferedReader;
    import java.io.FileNotFoundException;
    import java.io.FileReader;
    import java.io.IOException;
     
    public class CVSTest {
     
     
        public static void main(String[] args) throws IOException {
     
            String lines = "";
            String unparsedFile = "";
            String myArray[];
     
            FileReader fr = new FileReader("c://Data1.csv");
            BufferedReader br = new BufferedReader(fr);
     
            while((lines = br.readLine()) != null) {
                unparsedFile += lines;
            }
            br.close();
     
            myArray = unparsedFile.split(",");
     
            for(String item : myArray){
                System.out.println(item);
            }
     
            }   
        }
    }


    --- Update ---

    Hand	Rank	Percentile	SB	BB	UG	MP	CO	BN
    [AJ][AJ]	1	0.01%	T	T	T	T	T	T
    [AT][AT]	2	0.01%	F	T	T	T	T	T
    [AQ][AQ]	3	0.02%	F	F	T	T	T	T
    [AJ][AT]	4	0.02%	F	F	F	T	T	T
    [A5][A5]	5	0.03%	F	F	F	F	T	T
    [A9][A9]	6	0.04%	F	F	F	F	F	T
    [AK][AK]	7	0.04%	F	F	F	F	F	T

    The CSV looks like the above. and I basically would like to read in the Hand to get it to show in a text box and then randomly have the program ask me to correctly identify the True/False return for one of the SB/BB/UG/MP/CO/BN columns. As you can prob tel i am not very good with Java... so i am stumbling my way through this. I know what I would like to do it, its just a case of how I get there!!!

    Thanks for any replies


  2. #2
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    Default Re: Reading CSV File

    You use the word "randomly," but what you mean by it isn't clear.

    What you describe (I think) could be done relatively simply by someone who has a good understanding of OOP with Java and is beginning to learn GUI programming using Swing. I don't know where you are on the knowledge and experience scale, but here are the Swing tutorials to get you started on the GUI using Swing part. Ignore the biased advice to use the Netbeans GUIBuilder and learn to code the GUI "by hand."

  3. #3
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    Default Re: Reading CSV File

    Thanks for the reply. That link is useful and i will have to read it quite a few times. As I am a complete beginner with limited free time to read up on Java, but the time I do have spare I spend trying to learn as much as I can.

    Sorry if I dont explain things well, English isn't my first language. I wish to have some kind of loop or iteration? that selects the "hand" as above, say for example [A9][A9] and displays this within a text box, then at the same time, another text box requres me to enter the correct T or F figure for any one of the T or F fields for that hand.

    And then the loop to work through the list of rows. Above is a sample - there are actually 16432 rows in the .CSV that i am using.

    Hope this makes sense

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    Default Re: Reading CSV File

    I recommend you create a Hand class that contains the attributes shown in each line. Read a line from the file, parse as needed, send the parsed data to the Hand constructor, and add the new Hand instance to a collection of some kind. Create methods in the Hand class as needed to provide the rest of the functionality you describe.

    As for the GUI interface part, you'll have to add that as you learn how. If you're in a hurry to get your idea working, you might get the functionality working from the command line first and then add the GUI when you've learned how.

  5. #5
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    Default Re: Reading CSV File

    I'll give that a go and then post what i come up with in here

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