for loop (i) variable used outside the loop or possible solution?

Question

I am trying to find a way for my startTextFieldListener to gain access to some variables in my for loop. Is there a way to do this? I'm sorry if there is an easy solution to this but I am not quite sure how to work around this. I have seen some examples but I did not know how to apply it to my program. Any help would be greatly appreciated.

public class TextArea1{

JTextArea text;
JFrame frame;
JTextField textField;
public int k;
public ArrayList aList;
public String correctAnswer;

public static void main (String [] args) {
    TextArea1 gui = new TextArea1();

    gui.go();
}
private String textLine;

public void go() {
    frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JPanel panel = new JPanel();
    textField = new JTextField("");
    textField.addActionListener(new startTextFieldListener(aList));
    JButton startButton  = new JButton ("Start!");
    startButton.addActionListener(new startButtonListener(aList));


    text = new JTextArea (30, 60);
    text.setLineWrap(true);

    JScrollPane scroller = new JScrollPane(text);
    scroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
    scroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);

    panel.add(scroller);

    frame.getContentPane().add(BorderLayout.CENTER, panel);
    frame.getContentPane().add(BorderLayout.WEST, startButton);
    frame.getContentPane().add(BorderLayout.SOUTH, textField);      
    frame.setSize(350, 300);
    frame.setVisible(true);
}       



class startButtonListener implements ActionListener {
 ArrayList aList;
 startButtonListener(ArrayList passedInList)
 {
      aList = passedInList;
 }

 @Override
public void actionPerformed(ActionEvent event) {
     String fileName = "test.txt";
    String line;
    ArrayList aList = new ArrayList();

    try {
         try (BufferedReader input = new BufferedReader (new FileReader(fileName))) {
             if (!input.ready())   {
                 throw new IOException();

             }

             while ((line = input.readLine()) !=null) {
                 aList.add(line);
             }}
    } catch (IOException e) {
        System.out.println(e);

    }

    int sz = aList.size();

       for (int k = 0; k< sz; k++) {          

        String correctAnswer = aList.get(k).toString();

    text.append(aList.get(k).toString());
    text.append("\n");
       }   
}
}       
    class startTextFieldListener implements ActionListener {
         startTextFieldListener(ArrayList passedInList)
         {
             aList = passedInList;
         }




         @Override
        public void actionPerformed(ActionEvent event) {
            text.getText();
             if (text.getText().equals(correctAnswer)) {
                JOptionPane.showMessageDialog(null, "Hooray!");
             }

             else if (!text.getText().equals(correctAnswer)) {
                JOptionPane.showMessageDialog(null, "Wrong!");


             }

            }



             }
        }

Answer 1

You could attempt to do this by trying to make the variables accessible to the entire class.

To implement this, you can add the variable declaration where you have declared your User Interface items, after the class declaration.

You could then access this variable in another class.

Example Code:

public class TextArea1{

JTextArea text;
JFrame frame;
JTextField textField;

public int sampleIntToBeUsed;

You could also implement this with various get/set methods.

How to Make a Constructor: (Put the name of the class with no return type)

class startButtonListener implements ActionListener {
     ArrayList aList;
     startButtonListener(ArrayList passedInList)
     {
          aList = passedInList;
     }

New Second ActionListener

class startTextFieldListener implements ActionListener {
     String correctAnswer;
     startTextFieldListener(String answer)
     {
         correctAnswer = answer;
     }

         @Override
        public void actionPerformed(ActionEvent event) {
             if (text.getText().equals(correctAnswer)) {
                JOptionPane.showMessageDialog(null, "Hooray!");
             }

             else {
                JOptionPane.showMessageDialog(null, "Wrong!");
             }

          }
     }
    }