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Thread: Import data form text into Jtable

  1. #1
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    Default Import data form text into Jtable

    Hello i made a GUI. In that GUI i make a Jtable here the code that i make the Jtable with name table 1
     centerPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
                        inCenterPanel = new JPanel(new GridLayout(1, 2));
                        label4 = new JLabel("A= ");
                        inCenterPanel.add(label4);
                        table1 = new JTable(x, x);
                        table1.setBackground(Color.red);
                        inCenterPanel.add(table1);
                        centerPanel.setBackground(Color.green);
                        inCenterPanel.setBackground(Color.green);
                        centerPanel.add(inCenterPanel);
                        contentPane.add(centerPanel, BorderLayout.NORTH);

    I make o method that i want the GUI read from text file and put the int elements into the jtable with name table 1! here is the code which i try to make that and i dont now how
    public void data2() {
     
     
            try {
                // Open the file that is the first
                // command line parameter
                FileInputStream fstream = new FileInputStream("data.txt");
                // Get the object of DataInputStream
                DataInputStream in = new DataInputStream(fstream);
                BufferedReader br = new BufferedReader(new InputStreamReader(in));
                String strLine;
                //Read File Line By Line
                while ((strLine = br.readLine()) != null) {
                    for (int i = 0; i < x; i++) {
                        for (int j = 0; j < x; j++) {
     
     
                        }
                    }
     
     
                }
                //Close the input stream
                in.close();
            } catch (Exception e) {//Catch exception if any
                System.err.println("Error: " + e.getMessage());
            }
     
        }
    i make this thread also here http://forums.netbeans.org/viewtopic.php?t=44908
    Can you help me ?
    Last edited by redpower1989; November 24th, 2011 at 05:53 AM.


  2. #2
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    Default Re: Import data form text into Jtable

    Are there any exceptions showing when you run it? If yes, paste here the full exceptions messages.

  3. #3
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    Default Re: Import data form text into Jtable

    Isn't that exception?
    catch (Exception e) {//Catch exception if any
    System.err.println("Error: " + e.getMessage());

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    Default Re: Import data form text into Jtable

    Quote Originally Posted by redpower1989 View Post
    Isn't that exception?
    Well, it's the coding part where you actually catching the exception. What i asked was, when you run the program, is there any exception on the console?

  5. #5
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    Default Re: Import data form text into Jtable

    here is the error
    Error: For input string: ""

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    Default Re: Import data form text into Jtable

    Doesn't this error clearly mean that you are passing an empty string?

  7. #7
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    Default Re: Import data form text into Jtable

    if you see my method data2() i haven't the line to read the integer numbers from text file and put them into my Jtable! I don't how to write that.

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    Default Re: Import data form text into Jtable

    So, now you came to the exact point. That was actually your problem. Now if you asked exactly this in your very first post, you will get the very specific answer.

    Well, start reading the file and get the data in the String variable. And then parse them to Integer using,
    Integer.parseInt(String obj);

  9. #9
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    Default Re: Import data form text into Jtable

    Well i think that is
    Integer.parseInt((String) strLine);
    am i right?

  10. #10
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    Default Re: Import data form text into Jtable

    Did you try?
    And yes you are right.
    Simply write
    Integer.parseInt(strLine);

  11. #11
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    Default Re: Import data form text into Jtable

    i write this to strLine= br.readLine();. But i don't know the command to put the numbers into my Jtable with name table 1

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