If statement 如何使用HandleButtoAction和if语句使更多按钮工作

我使用if和else语句成功地实现了两个按钮。如果我添加另一条if/else语句，程序将不再工作。如何添加更多语句，以便GUI中的其他按钮正常工作？我还有大约7个按钮要编码

 package finalgui;

import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;   
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Stage;


public class FXMLDocumentController{

@FXML
private Button btnViewSPC;
@FXML
private Button btnBack;

@FXML
private void handleButtonAction(ActionEvent event) throws IOException{
Stage stage;
Parent root;
if(event.getSource()==btnViewSPC) {
    //get reference to the button's stage
    stage=(Stage) btnViewSPC.getScene().getWindow();
    //load up next scene
    root = FXMLLoader.load(getClass().getResource("addviewdel.fxml"));
}
else{
    stage=(Stage) btnBack.getScene().getWindow();
    root = FXMLLoader.load(getClass().getResource("FinalGUI.fxml"));
}
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}

}

---

当然，您可以使用多个

if

语句来取消多个按钮的语言

Object source = event.getSource();
if (source == button1) {
    ...
} else if (source == button2) {
     ...
} else if (source == button2) {
     ...
}
...
else {
     ...
}

但是就个人而言，我更喜欢使用

userData

属性将数据与

按钮关联：

@FXML
private void initialize() {
    btnViewSPC.setUserData("addviewdel.fxml");
    btnViewSPC.setUserData("FinalGUI.fxml");
    ...
}

@FXML
private void handleButtonAction(ActionEvent event) throws IOException {
    Node source = (Node) event.getSource();

    Stage stage = (Stage) source.getScene().getWindow();
    Parent root = FXMLLoader.load(getClass().getResource(source.getUserData().toString()));

    Scene scene = new Scene(root);
    stage.setScene(scene);
    stage.show();
}


或者使用不同的方法处理来自不同按钮的事件。您仍然可以向控制器添加“帮助器方法”，以避免重复所有代码：

@FXML
private void handleButtonAction1(ActionEvent event) throws IOException {
    showStage(event, "addviewdel.fxml");
}

@FXML
private void handleButtonAction2(ActionEvent event) throws IOException {
    showStage(event, "FinalGUI.fxml");
}

...

private void showStage(ActionEvent event, String fxmlResource) throws IOException {
    Node source = (Node) event.getSource();

    Stage stage = (Stage) source.getScene().getWindow();
    Parent root = FXMLLoader.load(getClass().getResource(fxmlResource));

    Scene scene = new Scene(root);
    stage.setScene(scene);
    stage.show();
}

当然，您可以使用多个
if
语句来取消多个按钮的语言

Object source = event.getSource();
if (source == button1) {
    ...
} else if (source == button2) {
     ...
} else if (source == button2) {
     ...
}
...
else {
     ...
}

但是就个人而言，我更喜欢使用
userData
属性将数据与
按钮关联：

@FXML
private void initialize() {
    btnViewSPC.setUserData("addviewdel.fxml");
    btnViewSPC.setUserData("FinalGUI.fxml");
    ...
}

@FXML
private void handleButtonAction(ActionEvent event) throws IOException {
    Node source = (Node) event.getSource();

    Stage stage = (Stage) source.getScene().getWindow();
    Parent root = FXMLLoader.load(getClass().getResource(source.getUserData().toString()));

    Scene scene = new Scene(root);
    stage.setScene(scene);
    stage.show();
}


或者使用不同的方法处理来自不同按钮的事件。您仍然可以向控制器添加“帮助器方法”，以避免重复所有代码：

@FXML
private void handleButtonAction1(ActionEvent event) throws IOException {
    showStage(event, "addviewdel.fxml");
}

@FXML
private void handleButtonAction2(ActionEvent event) throws IOException {
    showStage(event, "FinalGUI.fxml");
}

...

private void showStage(ActionEvent event, String fxmlResource) throws IOException {
    Node source = (Node) event.getSource();

    Stage stage = (Stage) source.getScene().getWindow();
    Parent root = FXMLLoader.load(getClass().getResource(fxmlResource));

    Scene scene = new Scene(root);
    stage.setScene(scene);
    stage.show();
}