JavaFX and Scene Builder - Calculator

Controller.java

package sample;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.TextField;
import javafx.scene.text.Text;

public class Controller {

    @FXML
    private TextField textField;

    @FXML
    private Text savedNumbers;

    private String firstNumber = "";

    private String currentNumber = "";

    private String calculationType;

    @FXML
    void addAction(ActionEvent event) {
        calculationSetup("+");
    }

    @FXML
    void minusAction(ActionEvent event) {
        calculationSetup("-");
    }

    @FXML
    void divideAction(ActionEvent event) {
        calculationSetup("/");
    }

    @FXML
    void multiplicationAction(ActionEvent event) {
        calculationSetup("*");
    }

    public void calculationSetup(String calculationType){
        this.calculationType = calculationType;
        firstNumber = currentNumber;
        currentNumber = "";
        savedNumbers.setText(firstNumber + " " + calculationType);
    }

    @FXML
    void calculate(ActionEvent event) {
        int firstNumberInt = Integer.parseInt(firstNumber);
        int secondNumberInt = Integer.parseInt(currentNumber);

        switch (calculationType) {
            case "+" -> {
                int calculatedNumber = firstNumberInt + secondNumberInt;
                savedNumbers.setText(firstNumber + " + " + currentNumber + " = " + calculatedNumber);
                textField.setText(String.valueOf(calculatedNumber));
            }
            case "-" -> {
                int calculatedNumber = firstNumberInt - secondNumberInt;
                savedNumbers.setText(firstNumber + " - " + currentNumber + " = " + calculatedNumber);
                textField.setText(String.valueOf(calculatedNumber));
            }
            case "/" -> {
                double calculatedNumber = firstNumberInt / (double)secondNumberInt;
                savedNumbers.setText(firstNumber + " / " + currentNumber + " = " + calculatedNumber);
                textField.setText(String.valueOf(calculatedNumber));
            }
            case "*" -> {
                int calculatedNumber = firstNumberInt * secondNumberInt;
                savedNumbers.setText(firstNumber + " * " + currentNumber + " = " + calculatedNumber);
                textField.setText(String.valueOf(calculatedNumber));
            }
        }
    }

    @FXML
    void clearTextField(ActionEvent event) {
        currentNumber = "";
        textField.setText("");
        savedNumbers.setText("");
    }

    @FXML
    void button0Clicked(ActionEvent event) {
        if(!currentNumber.equals("")){
            addNumber("0");
        }
    }

    @FXML
    void button1Clicked(ActionEvent event) {
        addNumber("1");
    }

    @FXML
    void button2Clicked(ActionEvent event) {
        addNumber("2");
    }

    @FXML
    void button3Clicked(ActionEvent event) {
        addNumber("3");
    }

    @FXML
    void button4Clicked(ActionEvent event) {
        addNumber("4");
    }

    @FXML
    void button5Clicked(ActionEvent event) {
        addNumber("5");
    }

    @FXML
    void button6Clicked(ActionEvent event) {
        addNumber("6");
    }

    @FXML
    void button7Clicked(ActionEvent event) {
        addNumber("7");
    }

    @FXML
    void button8Clicked(ActionEvent event) {
        addNumber("8");
    }

    @FXML
    void button9Clicked(ActionEvent event) {
        addNumber("9");
    }

    public void updateTextField(){
        textField.setText(currentNumber);
    }

    public void addNumber(String number){
        currentNumber += number;
        updateTextField();
    }
}

Main.java

package sample;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
        primaryStage.setTitle("Hello World");
        primaryStage.setScene(new Scene(root));
        primaryStage.show();
    }


    public static void main(String[] args) {
        launch(args);
    }
}

sample.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.FlowPane?>
<?import javafx.scene.layout.VBox?>
<?import javafx.scene.text.Font?>
<?import javafx.scene.text.Text?>


<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="300.0" xmlns="http://javafx.com/javafx/15.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
   <children>
      <TextField fx:id="textField" editable="false" layoutX="25.0" layoutY="15.0" nodeOrientation="RIGHT_TO_LEFT" prefHeight="75.0" prefWidth="250.0" text="0">
         <font>
            <Font size="40.0" />
         </font>
      </TextField>
      <FlowPane layoutX="25.0" layoutY="125.0" prefHeight="180.0" prefWidth="180.0">
         <children>
            <Button mnemonicParsing="false" onAction="#button1Clicked" prefHeight="60.0" prefWidth="60.0" text="1">
               <font>
                  <Font size="25.0" />
               </font>
            </Button>
            <Button layoutX="10.0" layoutY="10.0" mnemonicParsing="false" onAction="#button2Clicked" prefHeight="60.0" prefWidth="60.0" text="2">
               <font>
                  <Font size="25.0" />
               </font>
            </Button>
            <Button layoutX="70.0" layoutY="10.0" mnemonicParsing="false" onAction="#button3Clicked" prefHeight="60.0" prefWidth="60.0" text="3">
               <font>
                  <Font size="25.0" />
               </font>
            </Button>
            <Button layoutX="130.0" layoutY="10.0" mnemonicParsing="false" onAction="#button4Clicked" prefHeight="60.0" prefWidth="60.0" text="4">
               <font>
                  <Font size="25.0" />
               </font>
            </Button>
            <Button layoutX="10.0" layoutY="70.0" mnemonicParsing="false" onAction="#button5Clicked" prefHeight="60.0" prefWidth="60.0" text="5">
               <font>
                  <Font size="25.0" />
               </font>
            </Button>
            <Button layoutX="70.0" layoutY="70.0" mnemonicParsing="false" onAction="#button6Clicked" prefHeight="60.0" prefWidth="60.0" text="6">
               <font>
                  <Font size="25.0" />
               </font>
            </Button>
            <Button layoutX="130.0" layoutY="70.0" mnemonicParsing="false" onAction="#button7Clicked" prefHeight="60.0" prefWidth="60.0" text="7">
               <font>
                  <Font size="25.0" />
               </font>
            </Button>
            <Button layoutX="10.0" layoutY="130.0" mnemonicParsing="false" onAction="#button8Clicked" prefHeight="60.0" prefWidth="60.0" text="8">
               <font>
                  <Font size="25.0" />
               </font>
            </Button>
            <Button layoutX="70.0" layoutY="130.0" mnemonicParsing="false" onAction="#button9Clicked" prefHeight="60.0" prefWidth="60.0" text="9">
               <font>
                  <Font size="25.0" />
               </font>
            </Button>
            <Button layoutX="70.0" layoutY="10.0" mnemonicParsing="false" onAction="#button0Clicked" prefHeight="60.0" prefWidth="60.0" text="0">
               <font>
                  <Font size="25.0" />
               </font>
            </Button>
            <Button mnemonicParsing="false" onAction="#calculate" prefHeight="60.0" prefWidth="60.0" text="=">
               <font>
                  <Font size="25.0" />
               </font>
            </Button>
            <Button mnemonicParsing="false" onAction="#clearTextField" prefHeight="60.0" prefWidth="60.0" text="C">
               <font>
                  <Font size="25.0" />
               </font>
            </Button>
         </children>
      </FlowPane>
      <VBox layoutX="215.0" layoutY="125.0" prefHeight="240.0" prefWidth="60.0">
         <children>
            <Button mnemonicParsing="false" onAction="#addAction" prefHeight="60.0" prefWidth="60.0" text="+">
               <font>
                  <Font size="25.0" />
               </font>
            </Button>
            <Button layoutX="10.0" layoutY="70.0" mnemonicParsing="false" onAction="#minusAction" prefHeight="60.0" prefWidth="60.0" text="-">
               <font>
                  <Font size="25.0" />
               </font>
            </Button>
            <Button layoutX="10.0" layoutY="130.0" mnemonicParsing="false" onAction="#divideAction" prefHeight="60.0" prefWidth="60.0" text="/">
               <font>
                  <Font size="25.0" />
               </font>
            </Button>
            <Button layoutX="10.0" layoutY="172.0" mnemonicParsing="false" onAction="#multiplicationAction" prefHeight="60.0" prefWidth="60.0" text="*">
               <font>
                  <Font size="25.0" />
               </font>
            </Button>
         </children>
      </VBox>
      <Text fx:id="savedNumbers" layoutX="30.0" layoutY="30.0" strokeType="OUTSIDE" strokeWidth="0.0" />
   </children>
</AnchorPane>

very helpful. clean

wonderful