Processing Text Input

• Use JTextField components to provide space for user input
  final int FIELD_WIDTH = 10; // In characters
  final JTextField rateField = new JTextField(FIELD_WIDTH);
• Place a JLabel next to each text field
  JLabel rateLabel = new JLabel("Interest Rate: ");
• Supply a button that the user can press to indicate that the input is ready for processing
  
• The button's actionPerformed method reads the user input from the text fields (use getText)

  class AddInterestListener implements ActionListener
  {
     public void actionPerformed(ActionEvent event)
     {
        double rate = Double.parseDouble(rateField.getText());
        . . .
     }
  }