public final class Main extends javafx.application.Application
{

  public static double celsiusAusKelvin( final double temperaturInCelsius )
  { return temperaturInCelsius - 273.15; }

  public static double kelvinAusCelsius( final double temperaturInCelsius )
  { return temperaturInCelsius + 273.15; }

  public void start( final javafx.stage.Stage window )
  {

    final javafx.scene.control.TextField text = new javafx.scene.control.TextField( "10"  );
    final javafx.scene.control.TextField text1 = new javafx.scene.control.TextField( "-263.15"  );
    final javafx.scene.control.Button button = new javafx.scene.control.Button( "Celsius in Kelvin" );
    final javafx.scene.control.Button button1 = new javafx.scene.control.Button( "Kelvin in Celsius" );

    final javafx.scene.layout.HBox hbox = new javafx.scene.layout.HBox();
    hbox.getChildren().add( text );
    hbox.getChildren().add( button );
    final javafx.scene.layout.HBox hbox1 = new javafx.scene.layout.HBox();
    hbox1.getChildren().add( text1 );
    hbox1.getChildren().add( button1 );
    final javafx.scene.layout.VBox vbox = new javafx.scene.layout.VBox();
    vbox.getChildren().add( hbox );
    vbox.getChildren().add( hbox1 );

    text.setOnAction
    ( e ->
      { text1.setText
        ( java.lang.String.valueOf
          ( kelvinAusCelsius( java.lang.Double.valueOf( text.getText() ).doubleValue() ))); });

    button.setOnAction
    ( e ->
      { text1.setText
        ( java.lang.String.valueOf
          ( kelvinAusCelsius( java.lang.Double.valueOf( text.getText() ).doubleValue() ))); });

    text1.setOnAction
    ( e ->
      { text.setText
        ( java.lang.String.valueOf
          ( celsiusAusKelvin( java.lang.Double.valueOf( text1.getText() ).doubleValue() ))); });

    final javafx.scene.Scene scene = new javafx.scene.Scene( vbox );
    window.setScene( scene );
    window.show(); }}