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class "Pane (fra JavaFX)" as Pane {
}
class Asteroids {
}
Pane <|-- Asteroids
class SpaceObject {
}
Asteroids *-right-> "*" SpaceObject: spaceObjects

class Asteroids1 {
}
class Asteroids2 {
}
class Asteroids3 {
}

Asteroids <|-- Asteroids1
Asteroids <|-- Asteroids2
Asteroids2 <|-- Asteroids3

public static void main(String[] args) {
   AsteroidsProgram.main(new String[]{inheritance.Asteroids1.class.getName()}); // lager en String-tabell med klassenavnet som eneste element
}

package inheritance;

import java.util.ArrayList;
import java.util.List;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Point2D;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.util.Duration;

public class Asteroids extends Pane implements EventHandler<KeyEvent>  {

	private List<SpaceObject> spaceObjects;
    
    protected void add(SpaceObject so, double x, double y) {
        so.translate(x, y);
        getChildren().add(so);
        spaceObjects.add(so);
    }
    public void init() {
        spaceObjects = new ArrayList<SpaceObject>();
    }

	public void run() {
		// setter opp simuleringstakt
        Timeline tickTimer = new Timeline(new KeyFrame(Duration.millis(50), new EventHandler<ActionEvent>() {
    		private int tickCount = 0;
            @Override
            public void handle(ActionEvent event) {
                tick(tickCount++);
            }
        }));
        tickTimer.setCycleCount(Timeline.INDEFINITE);
        tickTimer.play();
        requestFocus();
        setOnKeyPressed(this);
        setOnKeyTyped(this);
    }

	// kalles når spesialtaster som pilene trykkes
	protected void handleKey(KeyCode keyCode) {
    }

	/*
     * Used for pausing or stepping
     */
    private int steps = -1;
    
    protected void handleKey(String character) {
        if ("+".equals(character)) {
            zoom(2);
        } else if ("-".equals(character)) {
            zoom(0.5);
        } else if (" ".equals(character)) {
            // toggle steps
            steps = (steps < 0 ? 0 : -1);
        } else if (">".equals(character)) {
            // one step
            steps = 1;
        }
    }

	private void zoom(double factor) {
        setScaleX(getScaleX() * factor);
        setScaleY(getScaleY() * factor);
    }
    
    @Override
    public void handle(KeyEvent keyEvent) {
        if (keyEvent.getCode() == KeyCode.UNDEFINED) {
            handleKey(keyEvent.getCharacter());
        } else {
            handleKey(keyEvent.getCode());
        }
    }

	private void tick(int tickCount) {
        
        if (steps == 0) {
            return;
        } else if (steps > 0) {
            steps--;
        }

		// accelerate due to gravity

		// lag en (dobbel) løkke her, som
		// håndterer gravitasjonskraften for alle par i spaceObjects-lista 

        // move all objects
        for (SpaceObject spaceObject : spaceObjects) {
            spaceObject.tick();
        }

        // check for collision
		// lag en (dobbel) løkke her, som
		// sjekker for og håndterer kollisjoner for alle par i spaceObjects-lista
    }

	public void handleGravity(SpaceObject spaceObject1, SpaceObject spaceObject2) {
		// regn ut avstanden mellom spaceObject1 og spaceObject2 (bruk getCenter-metoden),
		// beregn den gjensidige gravitasjonskraften basert på formelen
		// masse1 * masse2 / avstand ^ 2, og
		// påfør kraften med SpaceObject.applyForce-metoden
    }

	//

	public static void main(String[] args) {
   		AsteroidsProgram.main(new String[]{inheritance.Asteroids.class.getName()}); // lager en String-tabell med klassenavnet som eneste element
	}
}

package inheritance;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class AsteroidsProgram extends Application {
    private int width = 800, height = 600;
    @Override
    public void start(Stage stage) throws Exception {
        String paneClassName = getParameters().getRaw().get(0);
        final Asteroids asteroidsPane = (Asteroids) Class.forName(paneClassName).newInstance();
        asteroidsPane.setPrefSize(width, height);
        Scene scene = new Scene(asteroidsPane, width, height, Color.BLACK);
        stage.setScene(scene);
        stage.show();
        Platform.runLater(new Runnable() {
            @Override
            public void run() {
                asteroidsPane.init();
                asteroidsPane.run();
            }
        });
    }
    
    public static void main(String[] args) {
        launch(AsteroidsProgram.class, args);
    }
}