No errors, but crashing - JOptionPane - JavaFX

问题

I am trying to get a pop-up message when the cake node is clicked on. It prints to the console, but "JOptionPane.showMessageDialog(null,"Test");" crashes the program when I click on the cake (no errors). Any ideas?

class Cake extends Item {

double dx=3,dy=1.6;

Cake(String imageFile, double x, double y) {
    super(imageFile, x, y);
}


@Override
public void move() {
    this.setX(this.getX()+dx);

    if(this.getX()>749 || this.getX()<-20) {
        dx=-dx;
    }

    this.setY(this.getY()+dy);

    if(this.getY()>530 || this.getY()<0) {
        dy=-dy;
    }


}


@Override
public void collision() {
    //System.out.println("Cake");
    JOptionPane.showMessageDialog(null,"Test");


}

}

回答1:

Don't use Swing's JOptionPane in a JavaFX application. Use Dialog, or in this case an Alert instead:

@Override
public void collision() {
    //System.out.println("Cake");

    Alert alert = new Alert(Alert.AlertType.INFORMATION);
    alert.setHeaderText("Test");
    alert.showAndWait();
}

来源：https://stackoverflow.com/questions/37631357/no-errors-but-crashing-joptionpane-javafx