Simple JavaFX FXML Calculator Using Bindings

	package application;
	import javax.annotation.PostConstruct;
	import javafx.beans.binding.Bindings;
	import javafx.beans.binding.NumberBinding;
	import javafx.beans.property.DoubleProperty;
	import javafx.beans.property.SimpleDoubleProperty;
	import javafx.fxml.FXML;
	import javafx.scene.control.TextField;
	import javafx.util.StringConverter;
	import javafx.util.converter.DoubleStringConverter;
	public class CalculatorController{
	@FXML
	private TextField number1TextField;
	@FXML
	private TextField number2TextField;
	@FXML
	private TextField sumTextField;
	@FXML
	private TextField difTextField;
	@FXML
	private TextField multTextField;
	@FXML
	private TextField divTextField;
	// private NumberBinding sum, dif, mult, div;
	private DoubleProperty num1, num2, suma, dif, mult, div;
	// @PostConstruct
	@FXML
	private void initialize(){
	num1 = new SimpleDoubleProperty(1);
	num2 = new SimpleDoubleProperty(2);
	suma = new SimpleDoubleProperty();
	dif = new SimpleDoubleProperty();
	mult = new SimpleDoubleProperty();
	div = new SimpleDoubleProperty();
	suma.bind(num1.add(num2));
	dif.bind(num1.subtract(num2));
	mult.bind(num1.multiply(num2));
	div.bind(num1.divide(num2));
	StringConverter<? extends Number> converter = new DoubleStringConverter();
	Bindings.bindBidirectional(number1TextField.textProperty(), num1, (StringConverter<Number>)converter);
	Bindings.bindBidirectional(number2TextField.textProperty(), num2, (StringConverter<Number>)converter);
	Bindings.bindBidirectional(sumTextField.textProperty(), suma, (StringConverter<Number>)converter);
	Bindings.bindBidirectional(difTextField.textProperty(), dif, (StringConverter<Number>)converter);
	Bindings.bindBidirectional(multTextField.textProperty(), mult, (StringConverter<Number>)converter);
	Bindings.bindBidirectional(divTextField.textProperty(), div, (StringConverter<Number>)converter);
	}
	}

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