问如何用循环使程序复位回到开头

EN

public class MoneyConversionPanel extends JPanel {

    JLabel yenLabel = new JLabel();
    JLabel poundLabel = new JLabel();
    JLabel euroLabel = new JLabel();
    JTextField yenText = new JTextField("Enter Yen amount here:");
    JTextField poundText = new JTextField("Enter Pound amount here:");
    JTextField euroText = new JTextField("Enter Euro amount here:");
    JButton continueButton = new JButton("Click to reset");
    JButton yenButton = new JButton("Convert");
    JButton poundButton = new JButton("Convert");
    JButton euroButton = new JButton ("Convert");
    MoneyConversion userInput;

    public MoneyConversionPanel()
    {

    Dimension dimension = new Dimension(1200,1000);

    setPreferredSize(dimension);

    setBackground(Color.cyan);

    yenButton.addActionListener(new buttonListener());

    add(yenLabel);
    add(poundLabel);
    add(euroLabel);
    add(yenText);
    add(poundText);
    add(continueButton);
    continueButton.setVisible(false);
    add(euroText);
    add(yenButton);
    add(poundButton);
    add(euroButton);

}

    private class buttonListener implements ActionListener
    {
        double conversionDouble;
        NumberFormat costFmt = NumberFormat.getCurrencyInstance();


        @Override
        public void actionPerformed(ActionEvent e) {

    do {

        for(int i = 0; i < 1; i++)
        {
        if(e.getSource() == yenButton)

        {
            userInput = new MoneyConversion(Double.parseDouble(yenText.getText()));
            conversionDouble = userInput.convertYen();
            yenLabel.setText("" + costFmt.format(conversionDouble));
            continueButton.setVisible(true);
        }

        else if(e.getSource() == poundButton)
        {
            userInput = new MoneyConversion(Double.parseDouble(poundText.getText()));
            conversionDouble = userInput.convertPounds();
            poundLabel.setText("" + costFmt.format(conversionDouble));
            continueButton.setVisible(true);
        }

        else if(e.getSource() == euroButton)
        {
            userInput = new MoneyConversion(Double.parseDouble(euroText.getText()));
            conversionDouble = userInput.convertEuro();
            euroLabel.setText("" + costFmt.format(conversionDouble));
            continueButton.setVisible(true);
        }
        }

    } while(e.getSource() == continueButton);
        } 

        }

}