Operation . This application accepts user entries and validates them according to the specifications below . If the data is valid, this app displays the data in a dialog box. Then, when the user clicks OK in the dialog box, the application clears the text fields, so the user can make another entry .

If the data is not valid, this app displays a dialog box with an appropriate error message and attempts to move the focus to the text field with the invalid data Specifications

The Name field is required . The Age field is required and must be a valid integer value . The Sales field is required and must be a valid double value .

Create a class named SwingValidator to perform the validation. This class should contain these methods

boolean isNotEmpty (JTextField field, String fieldName)

boolean isInteger (JTextField field, String fieldName)

boolean isDouble (JTextField field, String fieldName)