Converter by Ademir Sehic & Hasan Muratovic

package homenew;
import javafx.application.Application;
import javafx.geometry.HPos;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;

public class homeneww extends Application {
    @Override
    public void start(Stage myStage) {

        myStage.setTitle("Converter");

        GridPane rootNode = new GridPane();
        rootNode.setPadding(new Insets(15));
        rootNode.setHgap(5);
        rootNode.setVgap(5);
        rootNode.setAlignment(Pos.CENTER);

        Scene myScene = new Scene(rootNode, 250, 150);

        rootNode.add(new Label("Enter km/h:"), 0, 0);
        TextField firstValue = new TextField();
        rootNode.add(firstValue, 1, 0);

        double secondValue= 0.621371192;
        rootNode.add(new Label("Speed in mp/h is: "), 0, 3);
        Button aButton = new Button("Convert");
        rootNode.add(aButton, 1, 2);
        GridPane.setHalignment(aButton, HPos.LEFT);
        TextField result = new TextField();
        result.setEditable(false);
        rootNode.add(result, 1, 3);

        aButton.setOnAction(e -> {
            double value1 = Integer.valueOf(firstValue.getText());

            double r = value1 * secondValue;
            result.setText(String.valueOf(r));
        });

        myStage.setScene(myScene);

        myStage.show();
    }

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

}