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JavaFX - 如何創(chuàng)建StackPane

我們想知道如何創(chuàng)建StackPane。 
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.layout.Region;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

public class Main extends Application {

    @Override public void start(Stage stage) {
      Group group = new Group();
        Scene scene = new Scene(group); 

        StackPane stack = new StackPane();
        stack.setMaxSize(Region.USE_PREF_SIZE, Region.USE_PREF_SIZE);
        stack.getChildren().addAll(new Rectangle(100,100,Color.BLUE));
        
        group.getChildren().add(stack);
        
        stage.setTitle("Welcome to JavaFX!"); 
        stage.setScene(scene); 
        stage.sizeToScene(); 
        stage.show(); 
    }

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