How to make program reset back to the beginning with a loop

Question

I have a simple money conversion program that allows the user to enter in one of three textfields in order to have their amount be converted into USD. I want the user to be able to enter information as many times as they want, so I've created a JButton called continueButton , but I'm having trouble making loop correctly and reset the program.

Question: How can I write a loop statement to make this program start at the beginning, allowing the user to enter numbers again?

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);
        } 

        }

}

Answer 1

Suggestions:

• Use just one JTextField input window.
• Prompt with a JLabel to the left of this window.
• Have either three conversion JButtons, one for each currency
• Or one conversion JButton and 3 JRadioButtons to allow the user to select which currency to convert to.
• There's no need to loop or reset. Just simply do the conversion and display it each time the button is pressed -- that's it.