I'm in the process of writing a program, and I get to the part(which I've commented below) and I try to do
if(userInput.get() != "")
It still executes the code inside the if statement if I leave the dialog box blank and press "ok" or enter. So it would say:
"You did not enter numeric information"
instead of
"You did not enter any information"
like in the outer else statement.
I tried with null and it didn't work either. What am I doing wrong here?
import java.util.Optional;
import javafx.application.*;
import javafx.event.*;
import javafx.geometry.Pos;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.input.*;
import javafx.scene.layout.*;
import javafx.scene.paint.*;
import javafx.scene.shape.*;
import javafx.scene.text.*;
import javafx.stage.*;
import javafx.stage.Stage;
public class QuizDialogBox extends Application {
public void start(Stage primaryStage) {
TextInputDialog inputDialog = new TextInputDialog();
inputDialog.setHeaderText(null);
inputDialog.setTitle("Grams to Ounces");
inputDialog.setContentText("Enter number of Grams: ");
Alert errorAlert = new Alert(AlertType.ERROR);
Optional<String> userInput = inputDialog.showAndWait();
if((userInput.get() != "") && userInput.isPresent()) //the part thats not working
{
String userInputString = userInput.get();
System.out.println("{" + userInputString + "}");
if(isNumeric(userInputString))
{
int userNumber = Integer.parseInt(userInputString);
System.out.println(userNumber);
}
else
{
errorAlert.setContentText("You did not enter numeric information");
errorAlert.showAndWait();
}
}
else
{
errorAlert.setContentText("You did not enter any information");
errorAlert.showAndWait();
}
}
public static void main(String args[]) {
launch(args);
}
public static boolean isNumeric(String string) {
boolean isNumber = false;
try
{
Integer.parseInt(string);
isNumber = true;
}
catch(NumberFormatException ex) {
}
return isNumber;
}
}
