package basicdemo;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import org.netbeans.validation.api.builtin.Validators;
import org.netbeans.validation.api.ui.ValidationGroup;
import org.netbeans.validation.api.ui.ValidationPanel;
public class Main {
  public static void main(String[] args) {
    //This is our actual UI
    JPanel inner = new JPanel();
    JLabel lbl = new JLabel("Enter a URL");
    JTextField f = new JTextField();
    f.setColumns(40);

    //Setting the component name is important - it is used in
    //error messages
    f.setName("URL");

    inner.add(lbl);
    inner.add(f);

    //Create a ValidationPanel - this is a panel that will show
    //any problem with the input at the bottom with an icon
    ValidationPanel panel = new ValidationPanel();
    panel.setInnerComponent(inner);
    ValidationGroup group = panel.getValidationGroup();

    //This is all we do to validate the URL:
    group.add(f, Validators.REQUIRE_NON_EMPTY_STRING,
            Validators.NO_WHITESPACE,
            Validators.URL_MUST_BE_VALID);

    //Convenience method to show a simple dialog
    if (panel.showOkCancelDialog("URL")) {
      System.out.println("User clicked OK.  URL is " + f.getText());
      System.exit(0);
    } else {
      System.err.println("User clicked cancel.");
      System.exit(1);
    }
  }
}