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Thread: How do I print out the whole of my text file?

  1. #1
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    Default How do I print out the whole of my text file?

    Here's my code:

    public static void main(String[]args){
     
                   try{
                    FileReader fileReader = new FileReader("data_file/Contact.txt");
                    BufferedReader in = new BufferedReader(fileReader);
                    String currentContact = in.readLine();
                                    while(currentContact != null) {
                        JOptionPane.showMessageDialog(null, "Contact: \n" + currentContact);
                   //     System.out.println("Contact:" + currentContact);
                        currentContact = in.readLine();
                    }}
                catch (IOException e) {
                    e.printStackTrace();
                           }}}

    Here are the information in my text files:

    Mini Toon $38.00 Qty: 8
    Gatsby $45.00 Qty: 5

    My program only show the first line and upon clicking ok (using the JOption.Pane), then it shows the 2nd line.

    I would like to know how do I print or show the entire text file - the 2 lines all at once.

    Thanks.


  2. #2
    Senior Member PhHein's Avatar
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    Default Re: How do I print out the whole of my text file?

    Add the contracts to a StringBuilder in the loop and display the JOptionPane after the loop.

  3. #3
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    Default Re: How do I print out the whole of my text file?

    Quote Originally Posted by PhHein View Post
    Add the contracts to a StringBuilder in the loop and display the JOptionPane after the loop.
    OK. I heed your advice and added the StringBuilder but I still get the txt in 2 goes; not appearing once in the JOption.
    try{
                    FileReader fileReader = new FileReader("data_file/Contact.txt");
                    BufferedReader in = new BufferedReader(fileReader);
                    String currentContact = in.readLine();
                    StringBuilder sb = new StringBuilder();  
                    while(currentContact != null) {                   
                        sb.append(currentContact);
                        JOptionPane.showMessageDialog(null, "Contact: \n" + currentContact);
                   //     System.out.println("Contact:" + currentContact);                    
                                currentContact = in.readLine();
                    }}
                catch (IOException e) {
                    e.printStackTrace();
                           }}}

    Did I miss out anything?

    --- Update ---

    Hi,

    I modified the code a little and this time round is better - the information will all come out at once. The bad news is that it only appeared on the 2nd time. The first JOptionPane Message still give me the same old one line and not all.

    Here's my code and I hope someone can tell me where I have gone wrong:

     
     try{
                    FileReader fileReader = new FileReader("data_file/Contact.txt");
                    BufferedReader in = new BufferedReader(fileReader);
                    String currentContact = in.readLine();
                    StringBuilder sb = new StringBuilder();  
                    while(currentContact != null) {   
                       StringBuilder current = sb.append(currentContact);
                        current.append(System.getProperty("line.separator"));
                        JOptionPane.showMessageDialog(null, "Contact  : \n" + current)  ;
                   //     System.out.println("Contact:" + currentContact);                    
                           currentContact = in.readLine();
                    }} 
                catch (IOException e) {
                    e.printStackTrace();
                           }}}

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