title: GUI Save Feature so that when the GUI is closed, when it reopens it has the same data visible
body: <blockquote>
    <p>GUI Save Feature so that when the GUI is closed, when it reopens it has the same data visible. Right now the GUI works fine, and the logic segment is unfinished but that doesn't affect the problem at hand. Thanks lads.   </p>
  </blockquote>
  
  <pre><code>    import java.awt.*; 
  import java.awt.event.*;
      import javax.swing.*; 
      import java.text.NumberFormat;
      import java.lang.Math;
  
      public class abdul { 
  
          public static void main(String[] args) { 
              JFrame frame = new FutureValueFrame(); 
          frame.setVisible(true); } }
  
      class FutureValueFrame extends JFrame {
          public FutureValueFrame() { 
          setTitle("Loan Calculator");
          setSize(300, 300); 
          centerWindow(this); 
          setResizable(false);
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
          JPanel panel = new FutureValuePanel(); 
          this.add(panel); } 
          private void centerWindow(Window w) { 
              Toolkit tk = Toolkit.getDefaultToolkit(); 
              Dimension d = tk.getScreenSize(); 
              setLocation((d.width-w.getWidth())/2, (d.height-w.getHeight())/2); } }
  
      class FutureValuePanel extends JPanel implements ActionListener {
          private JTextField paymentText, rateText, yearsText, loanText;
          private JLabel paymentLabel, rateLabel, yearsLabel, loanLabel; 
          private JButton calculateButton, exitButton, paymentButton, loanButton;
  
          public FutureValuePanel() { // display panel 
          JPanel displayPanel = new JPanel();
          displayPanel.setLayout( new FlowLayout(FlowLayout.RIGHT));
  
  
           loanLabel = new JLabel("Loan Amount:");
          displayPanel.add(loanLabel); 
          //hello
          loanText = new JTextField(10);
          displayPanel.add(loanText);
  
          //////
  
  
  
          ///////
          rateLabel = new JLabel("Yearly Interest Rate:"); 
          displayPanel.add(rateLabel); 
  
          rateText = new JTextField(10);
          displayPanel.add(rateText); 
  
  
      ////////
          yearsLabel = new JLabel("Number of Years:"); 
          displayPanel.add(yearsLabel);
  
          yearsText = new JTextField(10);
          displayPanel.add(yearsText); 
  
  
  
      ////////
          paymentLabel = new JLabel("Monthly Payment:"); 
          displayPanel.add(paymentLabel); 
          //hello
          paymentText = new JTextField(10); 
          displayPanel.add(paymentText);  
  
  
      // button panel
      JPanel buttonPanel = new JPanel();
      JPanel alphaPanel = new JPanel();
      ;
      buttonPanel.setLayout( new FlowLayout(FlowLayout.RIGHT));
      alphaPanel.setLayout( new FlowLayout(FlowLayout.RIGHT));
  
      // calculate button 
      calculateButton = new JButton("Calculate");
      calculateButton.addActionListener(this);
      buttonPanel.add(calculateButton); 
  
      paymentButton = new JButton("Monthly Payment");
      paymentButton.addActionListener(this);
      alphaPanel.add(paymentButton);
  
  
      loanButton = new JButton("Loan Amount");
      loanButton.addActionListener(this);
      alphaPanel.add(loanButton);
  
  
      // exit button
      exitButton = new JButton("Exit");
      exitButton.addActionListener(this); 
      buttonPanel.add(exitButton); 
      // add panels to main panel
      this.setLayout(new BorderLayout());
      this.add(displayPanel, BorderLayout.CENTER);
      this.add(buttonPanel, BorderLayout.SOUTH); 
      this.add(alphaPanel, BorderLayout.NORTH);
      }
  
      public void actionPerformed(ActionEvent e) {
  
          Object source = e.getSource(); 
          if(source == exitButton) {
              System.exit(0);}
          if (source == paymentButton){
              paymentText.setEditable(false);
              paymentText.setFocusable(false);
              paymentText.setText(null);
              loanText.setEditable(true);
              loanText.setFocusable(true);
              }
  
          if (source == loanButton){
              loanText.setEditable(false);
              loanText.setFocusable(false); 
              loanText.setText(null);
              paymentText.setEditable(true);
              paymentText.setFocusable(true);
          }
          if (source == calculateButton){
              NumberFormat currency = NumberFormat.getCurrencyInstance();
              //  paymentText.setText(currency.format(Double.parseDouble(loanText.getText())));
              if()
              String the = currency.format(Double.parseDouble(loanText.getText()));
                          paymentText.setText(the);
  
              }
  
          }
  
          }
  </code></pre>