Writing New System Software(borud.no)

    package helloworld;
     
    import javafx.application.Application;
    import javafx.event.ActionEvent;
    import javafx.event.EventHandler;
    import javafx.scene.Scene;
    import javafx.scene.control.Button;
    import javafx.scene.layout.StackPane;
    import javafx.stage.Stage;
     
    public class HelloWorld extends Application {
        public static void main(String[] args) {
            launch(args);
        }
        
        @Override
        public void start(Stage primaryStage) {
            primaryStage.setTitle("Hello World!");
            Button btn = new Button();
            btn.setText("Say 'Hello World'");
            btn.setOnAction(new EventHandler<ActionEvent>() {
     
                @Override
                public void handle(ActionEvent event) {
                    System.out.println("Hello World!");
                }
            });
            
            StackPane root = new StackPane();
            root.getChildren().add(btn);
            primaryStage.setScene(new Scene(root, 300, 250));
            primaryStage.show();
        }
    }

    #include <QtWidgets>
    
    int main(int argc, char** argv) {
        QApplication app{argc, argv};
    
        QPushButton button{"Say 'Hello World'"};
        button.setWindowTitle("Hi");
        QObject::connect(&button, &QPushButton::clicked, [] {
            puts("Hello world !");
        });
    
        button.setMinimumSize({300, 250});
        button.show();

        return app.exec();
    }

    StackPane root = new StackPane();

    StackPane root;

    auto root = StackPane{foo, bar};

    https://stackoverflow.com/questions/18400210/java-8-where-is-trifunction-and-kin-in-java-util-function-or-what-is-the-alt