Java Swing: Implementing a validity check of input values

Question

In my Swing application, the user must insert numbers and values, before switching to the next window. Now as a clean program should, I check every input if its valid or not

Answer 1

One solution would be to use Swing's InputVerifier to validate input for every JTextField used. As the validation functionality is the same for each field, a single instance could be used for all components:

public class MyNumericVerifier extends InputVerifier {
    @Override
    public boolean verify(JComponent input) {
       String text = ((JTextField) input).getText();
       try {
          Integer.parseInt(text);
       } catch (NumberFormatException e) {
          return false;
       }

       return true;
    }
}

InputVerifier verifier = new MyNumericVerifier()
textField1.setInputVerifier(verifier);