从另一个方法获取输出

Question

这是我第一次在这里提问，我对JAVA知之甚少。

我需要将HexOld方法的输出转换为Extract方法。我尝试使用getter和setter但似乎没有用。下面是我的代码

public HexOld() throws FileNotFoundException, IOException{
EventQueue.invokeLater(new Runnable() {

        @Override
        public void run() {
            try {
                UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
            } catch (ClassNotFoundException ex) {
            } catch (InstantiationException ex) {
            } catch (IllegalAccessException ex) {
            } catch (UnsupportedLookAndFeelException ex) {
            }

            CapturePane capturePane = new CapturePane();
            JFrame frame = new JFrame();     
            JPanel panel = new JPanel();
            JButton start = new JButton ("Start");

            frame.setSize(800, 600);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setLayout(null);
            frame.setLocationRelativeTo(null);
            frame.add(panel);
            frame.setVisible(true);
            panel.add(capturePane);
            panel.setSize(500,700);                                
            panel.add(start);
            start.setLocation(10,20);
            start.setSize(40,40);
            start.setVisible(true);
            start.setLocation(0, 0);               
            start.addActionListener(new ActionListener()
            {
                public void actionPerformed (ActionEvent event)
                {  

                Extract();
                }
            });

            PrintStream ps = System.out;
            System.setOut(new PrintStream(new StreamCapturer("", capturePane, ps)));


            StringBuilder sb = new StringBuilder();


            try (BufferedInputStream is = new BufferedInputStream(new FileInputStream("C:/Temp/images.jpg"))) {
                for (int b; (b = is.read()) != -1;) {
                    String s = Integer.toHexString(b).toUpperCase();
                    if (s.length() == 1) {
                        sb.append('0');
                    }
                    sb.append(s).append(' ');

                }
                int idx = sb.length() - 48;

                while (idx > 0)
                {
                    sb.insert(idx, "-");
                    idx = idx - 48;
                }



            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            String delimiter = "-";
            String[] temp;
            temp = sb.toString().split(delimiter);
            for(int i =0; i < temp.length ; i++)

            System.out.println(temp[i]);                
        } 

    });        

我希望将ths方法的输出转换为此方法

    public void Extract(){

    String str ="What should i put here to get the output from method above?" ;
    Pattern pattern = Pattern.compile("(FF D8.*?FF D9)" );
    Matcher matcher = pattern.matcher(str);
    while (matcher.find()) {

        //System.out.println(matcher.group(1));

        JOptionPane.showMessageDialog(null,matcher.group(1));

        }