您可以从Alert实例窃取DialogPane，并将其添加到常规Stage。一个节点一次只能是一个场景的根，因此您需要首先替换警报场景的根：
public class AlertWithIcon
extends Application {
@Override
public void start(Stage stage) {
Alert alert = new Alert(Alert.AlertType.CONFIRMATION,
"Are you sure you want to delete this item?",
ButtonType.YES, ButtonType.NO);
alert.setHeaderText("Delete Item");
DialogPane pane = alert.getDialogPane();
ObjectProperty<ButtonType> result = new SimpleObjectProperty<>();
for (ButtonType type : pane.getButtonTypes()) {
ButtonType resultValue = type;
((Button) pane.lookupButton(type)).setOnAction(e -> {
result.set(resultValue);
pane.getScene().getWindow().hide();
});
}
pane.getScene().setRoot(new Label());
Scene scene = new Scene(pane);
Stage dialog = new Stage();
dialog.setScene(scene);
dialog.setTitle("Delete Item");
dialog.getIcons().add(new Image("GenericApp.png"));
result.set(null);
dialog.showAndWait();
System.out.println("Result is " + result);
}
}
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