我在 JavaFX 中遇到了一个小错误，需要帮助。我想在用户可以选择的范围内生成一个随机数。我选择了一个 slider ，并在用户更改它时获取 Controller 中的值并将其设置为随机数的范围。但是，当我开始检查某些用户输入是否高于或低于该数字时，界限将返回到 100(这是用户不更改 slider 时的默认值)。这是一些代码:
主要:
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
public static Stage pStage;
public static Parent root1;
public static Parent root2;
public static Parent root3;
public static Scene scene1;
public static Scene scene2;
public static Scene scene3;
public Main() {
}
@Override
public void start(Stage stage) throws Exception {
pStage = stage;
root1 = FXMLLoader.load(getClass().getResource("scene1.fxml"));
root2 = FXMLLoader.load(getClass().getResource("scene2.fxml"));
root3 = FXMLLoader.load(getClass().getResource("scene3.fxml"));
scene1 = new Scene(root1);
scene2 = new Scene(root2);
scene3 = new Scene(root3);
stage.setScene(scene1);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Controller :
import javafx.fxml.FXML;
import javafx.scene.control.Label;
import javafx.scene.control.Slider;
import javafx.scene.control.TextField;
public class Controller {
GuessingGame guessingGame = new GuessingGame();
//Hier die Zufallszahl hinsetzen und auf 100 und drüben dann mit Setter und Getter abgreifen
@FXML
private TextField textfield;
@FXML
private Label countText;
@FXML
public Label notification;
@FXML
public Label textBetween;
@FXML
public Slider sliderSettings;
int currentNumber;
@FXML
public void clickedOnExit() {
System.exit(1);
}
@FXML
public void clickedOnSettings() {
Main.pStage.setScene(Main.scene3);
System.out.println(guessingGame.getRandomBound());
}
@FXML
public void sliderSetValue() {
guessingGame.setRandomBound((int) sliderSettings.getValue());
System.out.println(guessingGame.getRandomBound());
}
@FXML
public void clickedBackToMenuSettings() {
Main.pStage.setScene(Main.scene1);
System.out.println(guessingGame.getRandomBound());
}
@FXML
public void clickedOnPlay() {
Main.pStage.setScene(Main.scene2); //Beim wechsel zu szene 2 wird der wert wieder auf 100 gesetzt
System.out.println(guessingGame.getRandomBound());
}
@FXML
public void clickedBackToMenu() {
Main.pStage.setScene(Main.scene1);
}
@FXML
public void enteredTextfield() {
System.out.println(guessingGame.getNumber());
currentNumber = Integer.parseInt(textfield.getText());
GuessingGame.Result checkNumber;
checkNumber = guessingGame.evaluateEnteredNumber(currentNumber);
if (checkNumber == GuessingGame.Result.HIGHER) {
notification.setText("HIGHER");
}
;
if (checkNumber == GuessingGame.Result.LOWER) {
notification.setText("LOWER");
}
;
if (checkNumber == GuessingGame.Result.EQUALS) {
notification.setText("YOU GOT IT!");
textBetween.setText("Congratulations! The number was: " + guessingGame.getNumber());
}
;
textfield.clear();
countText.setText("" + guessingGame.getCounter()); //Gibts ihr eine bessere Lösung?
}
}
游戏:
import java.util.Random;
public class GuessingGame {
Random rand = new Random();
private int number;
private int counter;
//Variable die maxhöhe der Zufallszahl am Anfang auf 100 Stand
private int randomBound = 100;
public enum Result {
EQUALS, HIGHER, LOWER
}
//Random number muss noch implementiert werden, sodass sie im Bound steht
public GuessingGame() {
getNumberToGuess(); //Konstruktor
}
public int getNumberToGuess() {
this.number = rand.nextInt(randomBound); //im bound muss der wert vom slide sein
return number;
}
//Methode für das Spielgeschehen gibt Das Ergebnis wieder obs höher/tiefer/gleich ist
public Result evaluateEnteredNumber(int enteredNumber) {
Result result;
counter++;
if (number > enteredNumber) {
result = Result.HIGHER;
} else if (number < enteredNumber) {
result = Result.LOWER;
} else {
result = Result.EQUALS;
}
return result;
}
//----------------------------------------------------//
//Getter und Setter//
//Setter und Getter für die Zufallszahl
public void setNumber(int newNumber) {
this.number = newNumber;
}
public int getNumber() {
return number;
}
//Setter und Getter für den Versuchzähler
public void setCounter(int newCounter) {
this.counter = newCounter;
}
public int getCounter() {
return counter;
}
//Setter und Getter für Die maxhöhe der Zufallszahl
public void setRandomBound(int newRandomBound) {
randomBound = newRandomBound;
}
public int getRandomBound() {
return randomBound;
}
}
场景1:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<children>
<Button fx:id="exitButton" layoutX="505.0" layoutY="349.0" mnemonicParsing="false" onAction="#clickedOnExit" prefHeight="37.0" prefWidth="81.0" text="Exit" />
<Button fx:id="playButton" layoutX="237.0" layoutY="163.0" mnemonicParsing="false" onAction="#clickedOnPlay" prefHeight="37.0" prefWidth="126.0" text="Play" />
<Button fx:id="settingsButton" layoutX="237.0" layoutY="213.0" mnemonicParsing="false" onAction="#clickedOnSettings" prefHeight="37.0" prefWidth="126.0" text="Settings" />
<Label layoutX="66.0" layoutY="14.0" prefHeight="117.0" prefWidth="469.0" text="GUESSING GAME">
<font>
<Font name="Arial Black" size="49.0" />
</font>
</Label>
</children>
</AnchorPane>
场景2
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<children>
<Label layoutX="72.0" prefHeight="20.0" prefWidth="457.0" text="GUESSING GAME">
<font>
<Font name="Arial Black" size="48.0" />
</font>
</Label>
<Label layoutX="72.0" layoutY="187.0" text="Your guess:">
<font>
<Font name="Arial" size="22.0" />
</font>
</Label>
<Label layoutX="395.0" layoutY="187.0" text="Attempts:">
<font>
<Font name="Arial" size="22.0" />
</font>
</Label>
<TextField fx:id="textfield" layoutX="197.0" layoutY="188.0" onAction="#enteredTextfield" prefHeight="25.0" prefWidth="66.0" />
<Label fx:id="countText" layoutX="496.0" layoutY="188.0" text="0">
<font>
<Font name="Arial" size="22.0" />
</font>
</Label>
<Label layoutX="48.0" layoutY="71.0" text="My number is a random number up to 100! Try to guess it!">
<font>
<Font name="Arial Black" size="16.0" />
</font>
</Label>
<Label fx:id="notification" layoutX="221.0" layoutY="120.0" text="Type a number!">
<font>
<Font name="Arial Black" size="22.0" />
</font>
</Label>
<Label fx:id="textBetween" layoutX="72.0" layoutY="272.0" prefHeight="26.0" prefWidth="356.0" text="Your number is between 0 and 100">
<font>
<Font name="Arial Black" size="17.0" />
</font>
</Label>
<Button fx:id="backToMenu" layoutX="485.0" layoutY="361.0" mnemonicParsing="false" onAction="#clickedBackToMenu" text="Back to Menu" />
</children>
</AnchorPane>
场景3:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.Slider?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<children>
<Slider fx:id="sliderSettings" layoutY="200.0" max="1000.0" minorTickCount="4" onMouseReleased="#sliderSetValue" prefHeight="38.0" prefWidth="592.0" showTickLabels="true" showTickMarks="true" snapToTicks="true" value="100.0" />
<Label layoutX="4.0" layoutY="117.0" prefHeight="47.0" prefWidth="592.0" text="How High can the number you want to guess be?">
<font>
<Font name="Arial Black" size="22.0" />
</font>
</Label>
<Button fx:id="backToMenuSettings" layoutX="497.0" layoutY="361.0" mnemonicParsing="false" onAction="#clickedBackToMenuSettings" text="Back to Menu" />
</children>
</AnchorPane>
现在的问题是:当您与 slider 交互时，随机绑定(bind)数字会发生变化，但是当您单击播放按钮时，随机绑定(bind)会回到 100，并且还会生成一个数字 100...而不是用户的数量决定拥有( slider )
最佳答案
因此将其添加到您的 Controller
@FXML
public void initialize() {
System.out.println(guessingGame);
}
在你的输出中你会注意到这一点
sample.GuessingGame@29794acb
sample.GuessingGame@6cc12f4f
sample.GuessingGame@757b7ff5
本质上，由于在 fxml 中为每个场景配置了相同的 Controller ，因此每个场景都将获得自己的实例，从而获得自己的 GuessingGame 实例。
有几种方法可以解决这个问题 - 我个人的建议是将 Controller 分开，因为 fxml Controller 可能很快就会失控。
无论哪种方式，都要在 Controller 外部初始化 GuessingGame 并将其传入。
当然，您可以保留单个 Controller 模型并将其传递到所有三个场景中。但是这样您就不会将操作配置到 fxml 中。
希望这有帮助。
关于java - 如何修复JavaFX中值发生变化的错误？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/60019567/