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Thread: Change it to array

  1. #1
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    Default Change it to array

    Hi guys,

    let's assum that we have the following program:

    import java.io.*;
     
     
    class readFile {
    public static void main(String[] args) {
    String fileName = "store"+ ".txt";
    String line;
     
    try {
    BufferedReader in = new BufferedReader(new FileReader(fileName));
    line = in.readLine();
    while (line != null) {
     
    System.out.println(line);
    line = in.readLine();
     
    }
     
    in.close();
    } catch (IOException iox) {
    System.out.println("Problem reading " + fileName);
    }
    }
    }

    The file have the following inputs:

    Jcomputer 12 33
    usb 2 34
    maps 44 41
    ups 23 22

    The column are 3 and the line are 4, one string and 2 integers. How can I put them in array (not arraylist)? Any ideas?


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    Default Re: Change it to array

    Read the file a whole line at a time using something like:

    // fileInput is a Scanner object on the file
    String[] lineOfData = fileInput.nextLine().split( " " );

    (I didn't look at your code, so Scanner is just a suggestion. Use your own approach to read the file a line at a time.)

    Then process the array lineOfData as needed. Either use as is, or send it to a constructor to create an object using the data in the array. Do not move the data into 3 parallel arrays.

  3. #3
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    Default Re: Change it to array

    Quote Originally Posted by mikerousse View Post
    The column are 3 and the line are 4, one string and 2 integers. How can I put them in array (not arraylist)? Any ideas?
    What you have not explained is what type of array you want/need.

    From each line you can have a String[] (as explained by GregBrannon), so you could have a String[][] to contain all datas. This can or cannot be acceptable, depending on what you do subsequently.

    Your file is a "store", so I imagine that each row is a "product". You could create a class Product that "models" the informations of a row. So, at the end, you could have a Product[] array. This is a very good solution (at least better than String[][]).
    Andrea, www.andbin.net SCJP 5 (91%) SCWCD 5 (94%)

    Useful links for Java beginners My new project Java Examples on Google Code

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    Default Re: Change it to array

    How can I do that?
    Any code examples?

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