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POWhat's wrong with my Dialog box and how should I change arraylist from different class and on separate .java file?
 

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  1. POWhat's wrong with my Dialog box and how should I change arraylist from different class and on separate .java file?
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    <p>I am trying to write a GUI program that will import a text file, read its content and put them into ArrayList. </p> <p>I write the panel in a separate .java file that contain the import button and perform the import function, while the Arraylist is on the different .java file (main method ones). </p> <p>How should I make ActionListener to read and import file contents into ArrayList from different class/.java file?</p> <p>My import dialog box alos causes error, what's wrong with it? The code works fine in CLI but not in GUI program.</p> <p><strong>This is the main method of GUI Frame, it will add the panel from different .java file:</strong></p> <pre><code>public class FrameGUI { public static void main(String[] args) throws Exception { //Creates ArrayList and initiating JFrame ArrayList&lt;String&gt; stringFile = new ArrayList&lt;String&gt;(); JFrame frame = new JFrame("Title"); *//Rest of the following codes here* } //---End of Main Method--- } ---End of the First .java file </code></pre> <p><strong>This is the second .java file, which contains panel with import button and performing the action, read the contents of .txt file and import them into arraylist:</strong></p> <pre><code>public class ImportPanel extends JPanel { private JButton importButton; public ImportPanel(ArrayList&lt;String&gt; StringFile) { //Setting up JButton and link it to inner class of //ActionListener importButton = new JButton("Import Data"); importButton.addActionListener(new importListener()); *//***Adding the button into panel, set background color and panel size* } //---End of main method--- //Private inner class: private class importListener implements ActionListener { public void actionPerformed (ActionEvent event) { //---Import Function--- //The following statement will ask the user for input first //BEFORE it displays title and JFrame //Setting the file type, showing the dialog box: JFileChooser chooser = new JFileChooser(); FileNameExtensionFilter filter = new FileNameExtensionFilter("TEXT FILES", "txt","text"); //only allows user to import .txt files chooser.setFileFilter(filter); int returnVal = chooser.showOpenDialog(null); //Execute the following and import data //if the file type match: Scanner fileScan; String stringAdd; if (returnVal == JFileChooser.APPROVE_OPTION) { File inputFile = chooser.getSelectedFile(); fileScan = new Scanner(inputFile); //Scan the first line as title: //-disable-frame = new JFrame (fileScan.nextLine()); //Parsing the data into Arraylist while (fileScan.hasNext()) { stringAdd = fileScan.nextLine(); StringFile.add(new String(stringAdd)); } } //End of the if statement- } } //---End of private inner class--- } //End of the second .java file </code></pre> <p>I have tried to search before asking for question, I know that in order to change variable on different class, we need to add something called reference. But I don't know how to add and where to add in this case, when the classes are on two different .java file, rather than one.</p>
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    1. USakaya
    1. USuser2789240
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      1. POWhat's wrong with my Dialog box and how should I change arraylist from different class and on separate .java file?
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    1. COFor better help sooner, post an [SSCCE](http://sscce.org/). An SSCCE can have more than one class, but they all must be in the same source file, with only one of the classes (the one with `main` method) declared `public`.
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      1. POWhat's wrong with my Dialog box and how should I change arraylist from different class and on separate .java file?
      1. USAndrew Thompson
 

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