LoanCalculatorFrame2

class LoanCalculatorPanel extends JPanel implements ActionListener
{
    private JTextField loanAmountField,
                       numberOfYearsField,
                       yearlyInterestField,
                       monthlyPaymentField;
    private JLabel loanAmountText,
                   yearlyInterestRateText,
                   numberOfYearsText,
                   monthlyPaymentText,
                   none,
                   calculate;
    private JButton calculateButton,
                    exitButton;
    private JRadioButton loanAmountButton,
                         monthlyPaymentButton;

    public LoanCalculatorPanel()
    {
        JPanel displayPanel = new JPanel();
        displayPanel.setLayout(new GridBagLayout()); //GridLayout (0,2,10,10)
        GridBagConstraints c = new GridBagConstraints();

        loanAmountText = new JLabel("Loan Amount: ");
        c.weightx = 1;
        c.weighty = 1;
        c.insets = new Insets(10, 10, 10, 10);
        c.gridx = 0;
        c.gridy = 0;
        displayPanel.add(loanAmountText, c);

        loanAmountField = new JTextField(15);
        c.gridx = 1;
        c.gridy = 0;
        c.fill = GridBagConstraints.HORIZONTAL;
        c.weightx = 0.5;
        displayPanel.add(loanAmountField, c);

        yearlyInterestRateText = new JLabel("Yearly Interest Rate: ");
        c.gridx = 0;
        c.gridy = 1;
        displayPanel.add(yearlyInterestRateText, c);

        yearlyInterestField = new JTextField(15);
        c.gridx = 1;
        c.gridy = 1;
        c.fill = GridBagConstraints.HORIZONTAL;
        //c.weightx = 0.5;
        displayPanel.add(yearlyInterestField, c);

        numberOfYearsText = new JLabel("Number of Years: ");
        c.gridx = 0;
        c.gridy = 2;
        displayPanel.add(numberOfYearsText, c);

        numberOfYearsField = new JTextField(15);
        c.gridx = 1;
        c.gridy = 2;
        c.fill = GridBagConstraints.HORIZONTAL;
        //c.weightx = 0.5;
        displayPanel.add(numberOfYearsField, c);

        monthlyPaymentText = new JLabel("Monthly Payment: ");
        c.gridx = 0;
        c.gridy = 3;
        displayPanel.add(monthlyPaymentText, c);

        monthlyPaymentField = new JTextField(15);
        c.gridx = 1;
        c.gridy = 3;
        c.fill = GridBagConstraints.HORIZONTAL;
        //c.weightx = 0.5;
        displayPanel.add(monthlyPaymentField, c);


        JPanel calculatePanel = new JPanel();
        calculatePanel.setLayout(new FlowLayout(FlowLayout.RIGHT));

        calculateButton = new JButton("Calculate");
        calculateButton.addActionListener(this);
        calculatePanel.add(calculateButton);

        exitButton = new JButton("Exit");
        exitButton.addActionListener(this);
        calculatePanel.add(exitButton);

        JPanel monthlyPaymentPanel = new JPanel();
        monthlyPaymentPanel.setLayout(new GridBagLayout()); //GridLayout(0, 2, 10, 10));

        monthlyPaymentPanel.setBorder(BorderFactory.createEtchedBorder(javax.swing.border.EtchedBorder.RAISED, java.awt.Color.white, java.awt.Color.lightGray));

        calculate = new JLabel ("Calculate:");
        c.insets = new Insets(10, 10, 10, 10);
        c.gridx = 0;
        c.gridy = 0;
        c.ipadx = 5;
        c.ipady = 5;
        monthlyPaymentPanel.add(calculate, c);


        monthlyPaymentButton = new JRadioButton("Monthly Payment");
        monthlyPaymentButton.addActionListener(this);
        c.gridx = 0;
        c.gridy = 1;
        monthlyPaymentPanel.add(monthlyPaymentButton, c);

        loanAmountButton = new JRadioButton("Loan Amount");
        loanAmountButton.addActionListener(this);
        c.gridx = 1;
        c.gridy = 1;
        monthlyPaymentPanel.add(loanAmountButton, c);

        this.setLayout(new BorderLayout(10, 10));
        this.add(displayPanel, BorderLayout.CENTER);
        this.add(calculatePanel, BorderLayout.SOUTH);
        this.add(monthlyPaymentPanel, BorderLayout.NORTH);
    }