Clash Royale CLAN TAG#URR8PPP

How do i prevent a Dialog from closing after button pressed?

After i return from the Dialog i want to use the values from the fields from the dialog and create a aobject to return. I do however want to test those values before i go back to the main screen. How do i prevent going back to the main screen when i use the ok button when the values are not ok? (using showandwait)

(DialogController Class)
public ProcedureBerekening processresults()
String oneSs = oneSsField.getText().replace(",",".").trim();
double oneSsDouble = Double.parseDouble(oneSs);
System.out.println(oneSsDouble);
String oneScoop = oneScoopField.getText().trim();
int oneScoopInt = Integer.parseInt(oneScoop);

String totalWeight = totalWeightField.getText().trim();
int totalWeightInt = Integer.parseInt(totalWeight);

String sampleWeight = sampleWeightField.getText().trim();
int sampleWeightInt = Integer.parseInt(sampleWeight);


ProcedureBerekening temp = ProcedureBerekening.createNewProcedureBerekening(oneSsDouble,sampleWeightInt,totalWeightInt,oneScoopInt);
return temp;

(Controller class)
Optional<ButtonType> result = dialog.showAndWait();
if(result.isPresent()&&result.get()==ButtonType.OK)
NewCalculationController controller = fxmlLoader.getController();
ProcedureBerekening newCalculation = controller.processresults();



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