Javafx使用不同窗格切换场景

我有一个类场景库，我想用它来切换场景。当我运行应用程序时，在PaneOne

private SceneLibrary SceneLibrary=new SceneLibrary（）上有错误和错误在场景中
private sceneOne=new Scene（new PaneOne（），300500）。我不能使用静态场景

public class SceneLibrary {
    private Stage primaryStage;
    private Scene sceneOne = new Scene(new PaneOne(),300,500);
    private Scene sceneTwo = new Scene(new PaneTwo(),400,500);

    public void setPrimaryStage(Stage primaryStage){
        this.primaryStage = primaryStage;
    }

    public void switchToOne(){
        primaryStage.setScene(sceneOne);
    }

    public void switchToTwo(){
        primaryStage.setScene(sceneTwo);
    }
}

我的PaneOne课程：

public class PaneOne extends AnchorPane {
    private SceneLibrary sceneLibrary = new SceneLibrary();
    public PaneOne() {
        Button button = new Button();
        this.getChildren().add(button);

        button.setOnAction(new EventHandler<ActionEvent>() {
            public void handle(ActionEvent event) {
                sceneLibrary.switchToTwo();
            }
        });
    }
}

共享
场景库的实例
：

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        SceneLibrary sceneLibrary = new SceneLibrary();
        sceneLibrary.setPrimaryStage(primaryStage);
        sceneLibrary.switchToOne();//set scene one to the stage 
        primaryStage.show();
    }

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

class PaneOne extends AnchorPane {

    public PaneOne(SceneLibrary sceneLibrary) {
        Button button = new Button("Switch To Scene 2");
        this.getChildren().add(button);
        button.setOnAction(event -> sceneLibrary.switchToTwo());
    }
}

class PaneTwo extends AnchorPane {

    public PaneTwo(SceneLibrary sceneLibrary) {
        Button button = new Button("Switch To Scene 1");
        this.getChildren().add(button);
        button.setOnAction(event -> sceneLibrary.switchToOne());
    }
}

class SceneLibrary {

    private Stage primaryStage;
    private final Scene sceneOne = new Scene(new PaneOne(this),300,500);
    private final Scene sceneTwo = new Scene(new PaneTwo(this),400,500);

    public void setPrimaryStage(Stage primaryStage){
        this.primaryStage = primaryStage;
    }

    public void switchToOne(){
        primaryStage.setScene(sceneOne);
    }

    public void switchToTwo(){
        primaryStage.setScene(sceneTwo);
    }
}

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        SceneLibrary sceneLibrary = new SceneLibrary();
        sceneLibrary.setPrimaryStage(primaryStage);
        sceneLibrary.switchToOne();//set scene one to the stage 
        primaryStage.show();
    }

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

class PaneOne extends AnchorPane {

    public PaneOne(SceneLibrary sceneLibrary) {
        Button button = new Button("Switch To Scene 2");
        this.getChildren().add(button);
        button.setOnAction(event -> sceneLibrary.switchToTwo());
    }
}

class PaneTwo extends AnchorPane {

    public PaneTwo(SceneLibrary sceneLibrary) {
        Button button = new Button("Switch To Scene 1");
        this.getChildren().add(button);
        button.setOnAction(event -> sceneLibrary.switchToOne());
    }
}

class SceneLibrary {

    private Stage primaryStage;
    private final Scene sceneOne = new Scene(new PaneOne(this),300,500);
    private final Scene sceneTwo = new Scene(new PaneTwo(this),400,500);

    public void setPrimaryStage(Stage primaryStage){
        this.primaryStage = primaryStage;
    }

    public void switchToOne(){
        primaryStage.setScene(sceneOne);
    }

    public void switchToTwo(){
        primaryStage.setScene(sceneTwo);
    }
}