我遇到一个问题，我似乎无法使用fxml从javafx中的新表单返回值。
我正在尝试一种具有4个与Connect 4游戏相关的功能的主要形式 开始游戏，查看玩家，查看游戏，查看玩家游戏
当我启动程序时，弹出主菜单，然后我想单击“开始游戏”按钮。 打开后，它将提示您输入用户1的信息。 然后弹出一个有关玩家信息的新表格。
我遇到的问题是，单击接受按钮后，类中的变量变为空 我尝试通过实例get方法从主菜单类进行访问，并且还返回到主类。
在ShowAndWait行之后，变量似乎被清空了。 在winodow之后，我如何以c＃方式检索变量信息
package Homework_5;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
import java.util.ArrayList;
public class Connect4Window extends Application {
ArrayList<Connect4Game> games = new ArrayList<>();
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("FXML_Files/MainMenu.fxml"));
primaryStage.setTitle("Connect 4");
primaryStage.setScene(new Scene(root));
primaryStage.show();
}
}
MainMenu类
package Homework_5.FXML_Java_Classes;
import Homework_5.DataClasses.PersonData;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
public class MainMenu {
@FXML
private Button btnViewGames;
@FXML
private Button btnViewPlayers;
@FXML
private Button btnStartGame;
@FXML
private Button btnViewPlayerGames;
@FXML
void startGame(ActionEvent event) {
Alert alert = new Alert(Alert.AlertType.NONE, "Please enter player 1 info");
alert.setHeaderText(null);
alert.setTitle("Player 1 info");
alert.showAndWait();
PlayerInfo playerInfo = new PlayerInfo();
playerInfo.Show();
System.out.println(playerInfo.getTxtName()); //Shows null
System.out.println(playerInfo.isInfoAccepted()); //Shows null
System.out.println(playerInfo.getChkComputer()); //Shows null
System.out.println(playerInfo.getColor()); //Shows null
}
@FXML
void viewPlayers(ActionEvent event) {
System.out.println("view players");
}
@FXML
void viewPlayerGames(ActionEvent event) {
System.out.println("view playergames");
}
@FXML
void viewGames(ActionEvent event) {
System.out.println("view games");
}
}
玩家信息类
package Homework_5.FXML_Java_Classes;
import Homework_5.DataClasses.PersonData;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.paint.Color;
import javafx.stage.Modality;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
public class PlayerInfo {
@FXML
private Button btnAccept;
@FXML
private ColorPicker colorColorPicker;
@FXML
private CheckBox chkComputer;
@FXML
private TextField txtName;
@FXML
private Button btnClear;
private boolean infoAccepted = false;
public PlayerInfo(){
}
public PersonData Show()
{
try{
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("../FXML_Files/PlayerInfo.fxml"));
Parent root1 = fxmlLoader.load();
Stage stage = new Stage();
stage.initModality(Modality.WINDOW_MODAL);
stage.setTitle("Enter Player Information");
stage.setScene(new Scene(root1));
stage.showAndWait();
return new PersonData(txtName.getText(), colorColorPicker.getValue(), chkComputer.isSelected());
} catch (Exception e)
{
e.printStackTrace();
}
return null;
}
@FXML
void Accept(ActionEvent event) {
if (txtName.getText().isEmpty()) {
Alert alert = new Alert(Alert.AlertType.WARNING, "The name field is blank!\n\nPlease enter a name.");
alert.setHeaderText(null);
alert.setTitle("Name Blank");
alert.showAndWait();
} else {
infoAccepted = true;
Stage stage = (Stage) btnAccept.getScene().getWindow();
stage.close();
}
}
@FXML
void Clear(ActionEvent event) {
txtName.clear();
colorColorPicker.setValue(Color.WHITE);
chkComputer.setSelected(false);
}
public Color getColor() {
return colorColorPicker.getValue();
}
public boolean getChkComputer() {
return chkComputer.isSelected();
}
public String getTxtName() {
return txtName.getText();
}
public boolean isInfoAccepted() {
return infoAccepted;
}
}
MainMenu fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.*?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<AnchorPane prefHeight="81.0" prefWidth="442.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="Homework_5.FXML_Java_Classes.MainMenu">
<children>
<Button fx:id="btnStartGame" layoutX="14.0" layoutY="14.0" mnemonicParsing="false" onAction="#startGame" prefHeight="55.0" prefWidth="86.0" text="Start Game" />
<Button fx:id="btnViewPlayers" layoutX="110.0" layoutY="14.0" mnemonicParsing="false" onAction="#viewPlayers" prefHeight="55.0" prefWidth="86.0" text="View Players" />
<Button fx:id="btnViewPlayerGames" layoutX="302.0" layoutY="14.0" mnemonicParsing="false" onAction="#viewPlayerGames" prefHeight="55.0" prefWidth="127.0" text="View Player Games" />
<Button fx:id="btnViewGames" layoutX="206.0" layoutY="14.0" mnemonicParsing="false" onAction="#viewGames" prefHeight="55.0" prefWidth="86.0" text="View Games" />
</children>
</AnchorPane>
玩家信息fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<AnchorPane prefHeight="201.0" prefWidth="213.0" rotate="-0.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="Homework_5.FXML_Java_Classes.PlayerInfo">
<children>
<Button fx:id="btnAccept" cancelButton="true" layoutX="14.0" layoutY="165.0" mnemonicParsing="false" onAction="#Accept" text="Accept" />
<Button fx:id="btnClear" layoutX="156.0" layoutY="165.0" mnemonicParsing="false" onAction="#Clear" text="Clear" />
<CheckBox fx:id="chkComputer" layoutX="57.0" layoutY="126.0" mnemonicParsing="false" text="Computer" />
<ColorPicker fx:id="colorColorPicker" layoutX="57.0" layoutY="81.0" />
<TextField fx:id="txtName" layoutX="57.0" layoutY="41.0" />
<Label contentDisplay="CENTER" layoutX="14.0" layoutY="14.0" text="Please Enter User Information below" />
<Label layoutX="14.0" layoutY="45.0" text="Name:" />
<Label layoutX="14.0" layoutY="85.0" text="Color:" />
</children>
</AnchorPane>
答案 0 :(得分：0)
您调用The honour roll students are:
----------------------------------------------------------------------
Devin Agorhom 83.75
Jevon Ahn 84.125
Chandler Akahira 82.5
Stas Al-Turki 84.25
...
-----------------------------------------------------------------------
The subject award winners are:
-----------------------------------------------------------------------
English: Josiah Gower with 99
Math: Carson Whicher with 99
Geography: Ismaila LeBlanc with 100
Science: Jonathan Emes with 100
Gym: Woo Taek (James) Irvine with 100
History: Tami Easterbrook with 100
Art: Nathan Bryson with 100
Music: Jamie Bates with 100
的{{1}}实例不是与PersonInfo一起使用的实例。如果提供了Show()属性，则PlayerInfo.fxml将创建控制器类的新实例。要访问此实例，请在调用FXMLLoader之后使用fx:controller的{{1}}方法。
您可以例如创建一个FXMLLoader方法来加载并使用它来创建控制器：
getControllerload()static或者，您可以使用public class PlayerInfo {
@FXML
private Parent root1;
public static PlayerInfo create() throws Exception {
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("../FXML_Files/PlayerInfo.fxml"));
fxmlLoader.load();
return fxmlLoader.getController();
}
public PersonData Show() {
Stage stage = new Stage();
stage.initModality(Modality.WINDOW_MODAL);
stage.setTitle("Enter Player Information");
stage.setScene(new Scene(root1));
stage.showAndWait();
return new PersonData(txtName.getText(), colorColorPicker.getValue(), chkComputer.isSelected());
}
...
}
并从“控制器”的构造函数中加载fxml，请参见custom component approach in Introduction to FXML