新人问题 JavaFx的Stage跳转问题

package cn.learn.filewriter;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.GridPane;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class Filewriter extends Application {
private Stage stage = new Stage();
private Stage stage1 = new Stage();
private Stage stage2 = new Stage();
private final int SCREENWIDTH = 333;
private final int SCREENHEIGHT = 300;

public void start(Stage primaryStage) {
    GridPane borderPane = new GridPane();
    Button btBack = new Button("OK");
    Text text=new Text("Stage");

    borderPane.add(btBack, 0, 0);
    borderPane.add(text, 0, 1);
    Scene scene = new Scene(borderPane, SCREENWIDTH, SCREENHEIGHT);
    stage.setScene(scene);
    stage.setTitle("Bank");
    stage.show();

    btBack.setOnAction(e -> fun1());
}

public void fun1() {
    GridPane borderPane = new GridPane();
    Button btBack = new Button("Back");
    Button btOk=new Button("OK");
    Text text=new Text("Stage1");


    borderPane.add(btBack, 5, 5);
    borderPane.add(btOk, 1, 5);
    borderPane.add(text, 0, 1);
    Scene scene = new Scene(borderPane, SCREENWIDTH, SCREENHEIGHT);
    stage1.setScene(scene);
    stage1.setTitle("Bank");
    stage1.show();

    btOk.setOnAction(e->fun2());

}

public void fun2() {
    GridPane borderPane = new GridPane();
    Button btBack = new Button("Back");
    Text text=new Text("Stage2");

    borderPane.add(btBack, 0, 0);
    borderPane.add(text, 0, 1);
    Scene scene = new Scene(borderPane, SCREENWIDTH, SCREENHEIGHT);
    stage2.setScene(scene);
    stage2.setTitle("Bank");
    stage2.show();

    btBack.setOnAction(e -> start(stage1));
}

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

}
比如这段代码
我想Stage2的back回到Stage1
应该怎么实现？
谢谢大家！

有人吗这个问题搞不是很懂

你试着不要把Stage2定义在方法里，而是定义在class类里，就是在primaryStage之前定义好，执行的跳转的时候不是func()方法执行而是stage2.show()，跳转回primarStage也是一样的操作。stage2.close();primaryStage.show().

用stage重新设置scene