尝试使用扩展版本的 AnchorPane 时实例化和加载异常
Instantiation and Load exception when trying to use an extended version of AnchorPane
对于一个项目，我得到了代码并且不得不将其重构为 FXML，我正在尝试使用一段代码，它是 AnchorPane 的扩展，但是当我将它从 AnchorPane 切换到我的世界时FXML 我在 Scene Builder 中遇到错误，当我 运行 它时。我已经尝试了很多东西，只是有点难过，不知道现在该尝试什么。我注释掉了 World 的原始构造函数，但可以 post 如果它可能相关
世界：
package game;
import javafx.animation.AnimationTimer;
import javafx.scene.Node;
import javafx.scene.layout.AnchorPane;
import java.util.ArrayList;
import java.util.List;
public abstract class World extends AnchorPane {
private AnimationTimer timer;
public void createTimer() {
timer = new AnimationTimer() {
@Override
public void handle(long now) {
act(now);
List<Actor> actors = getObjects(Actor.class);
for (Actor anActor: actors) {
anActor.act(now);
}
}
};
}
public void start() {
createTimer();
timer.start();
}
public void stop() {
timer.stop();
}
public void add(Actor actor) {
getChildren().add(actor);
}
public void remove(Actor actor) {
getChildren().remove(actor);
}
public <A extends Actor> List<A> getObjects(Class<A> cls) {
ArrayList<A> someArray = new ArrayList<A>();
for (Node n: getChildren()) {
if (cls.isInstance(n)) {
someArray.add((A)n);
}
}
return someArray;
}
public abstract void act(long now);
}
FXML
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.image.*?>
<?import javafx.scene.layout.*?>
<?import game.End?>
<?import game.Log?>
<?import game.WetTurtle?>
<?import game.Turtle?>
<?import game.Obstacle?>
<?import game.World?>
<World maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity"
prefHeight="800.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/10.0.2-internal"
xmlns:fx="http://javafx.com/fxml/1" fx:controller="game.Level1Controller">
<ImageView>
<image>
<Image url="@../backgrounds/frogbg.png" />
</image>
</ImageView>
<End layoutX="13.0" layoutY="138.8">
<image>
<Image url="@../end/End.png" />
</image></End>
<End layoutX="141.0" layoutY="138.0">
<image>
<Image url="@../end/End.png" />
</image>
</End>
<End layoutX="269.0" layoutY="138.0">
<image>
<Image url="@../end/End.png" />
</image>
</End>
<End layoutX="398.0" layoutY="138.0">
<image>
<Image url="@../end/End.png" />
</image>
</End>
<End layoutX="528.0" layoutY="138.0">
<image>
<Image url="@../end/End.png" />
</image>
</End>
<Log fitHeight="30.0" layoutY="209.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../log/log3.png" />
</image>
</Log>
<Log fitHeight="30.0" layoutX="220.0" layoutY="209.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../log/log3.png" />
</image>
</Log>
<Log fitHeight="30.0" layoutX="440.0" layoutY="209.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../log/log3.png" />
</image>
</Log>
<WetTurtle fitHeight="45.0" layoutX="600.0" layoutY="252.0" preserveRatio="true">
<image>
<Image url="@../turtle/TurtleAnimation1.png" />
</image>
</WetTurtle>
<WetTurtle fitHeight="45.0" layoutX="400.0" layoutY="252.0" preserveRatio="true">
<image>
<Image url="@../turtle/TurtleAnimation1.png" />
</image>
</WetTurtle>
<WetTurtle fitHeight="45.0" layoutX="200.0" layoutY="252.0" preserveRatio="true">
<image>
<Image url="@../turtle/TurtleAnimation1.png" />
</image>
</WetTurtle>
<Log fitHeight="35.0" layoutY="308.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../log/logs.png" />
</image>
</Log>
<Log fitHeight="35.0" layoutX="440.0" layoutY="308.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../log/logs.png" />
</image>
</Log>
<Log fitHeight="35.0" layoutX="50.0" layoutY="358.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../log/log3.png" />
</image>
</Log>
<Log fitHeight="35.0" layoutX="270.0" layoutY="358.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../log/log3.png" />
</image>
</Log>
<Log fitHeight="35.0" layoutX="490.0" layoutY="358.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../log/log3.png" />
</image>
</Log>
<Turtle fitHeight="45.0" layoutX="500.0" layoutY="402.0" preserveRatio="true">
<image>
<Image url="@../turtle/TurtleAnimation1.png" />
</image></Turtle>
<Turtle fitHeight="45.0" layoutX="300.0" layoutY="402.0" preserveRatio="true">
<image>
<Image url="@../turtle/TurtleAnimation1.png" />
</image>
</Turtle>
<WetTurtle fitHeight="45.0" layoutX="700.0" layoutY="402.0" preserveRatio="true">
<image>
<Image url="@../turtle/TurtleAnimation1.png" />
</image>
</WetTurtle>
<Obstacle fitHeight="28.0" layoutX="500.0" layoutY="511.0" preserveRatio="true">
<image>
<Image url="@../car/car1Left.png" />
</image>
</Obstacle>
<Obstacle fitHeight="35.0" layoutX="500.0" layoutY="557.0" preserveRatio="true">
<image>
<Image url="@../truck/truck2Right.png" />
</image>
</Obstacle>
<Obstacle fitHeight="35.0" layoutY="557.0" preserveRatio="true">
<image>
<Image url="@../truck/truck2Right.png" />
</image>
</Obstacle>
<Obstacle fitHeight="28.0" layoutX="550.0" layoutY="611.0" preserveRatio="true">
<image>
<Image url="@../car/car1Left.png" />
</image>
</Obstacle>
<Obstacle fitHeight="28.0" layoutX="400.0" layoutY="611.0" preserveRatio="true">
<image>
<Image url="@../car/car1Left.png" />
</image>
</Obstacle>
<Obstacle fitHeight="28.0" layoutX="250.0" layoutY="611.0" preserveRatio="true">
<image>
<Image url="@../car/car1Left.png" />
</image>
</Obstacle>
<Obstacle fitHeight="28.0" layoutX="100.0" layoutY="611.0" preserveRatio="true">
<image>
<Image url="@../car/car1Left.png" />
</image>
</Obstacle>
<Obstacle fitHeight="35.0" layoutX="600.0" layoutY="657.0" preserveRatio="true">
<image>
<Image url="@../truck/truck1Right.png" />
</image>
</Obstacle>
<Obstacle fitHeight="35.0" layoutX="300.0" layoutY="657.0" preserveRatio="true">
<image>
<Image url="@../truck/truck1Right.png" />
</image>
</Obstacle>
<Obstacle fitHeight="35.0" layoutY="657.0" preserveRatio="true">
<image>
<Image url="@../truck/truck1Right.png" />
</image>
</Obstacle>
</World>
错误
Exception in Application start method
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:473)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:372)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:941)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:973)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication(LauncherImpl.java:198)
at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: javafx.fxml.LoadException:
/C:/Users/harry/IdeaProjects/Frogger%20Game/out/production/Frogger%20Game/game/fxml/level1.fxml:16
at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2625)
at javafx.fxml/javafx.fxml.FXMLLoader.access0(FXMLLoader.java:105)
at javafx.fxml/javafx.fxml.FXMLLoader$InstanceDeclarationElement.constructValue(FXMLLoader.java:1021)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:754)
at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2722)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3253)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3210)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3179)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3152)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3129)
at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3122)
at Frogger.Game/game.Main.start(Main.java:25)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1(LauncherImpl.java:919)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait(PlatformImpl.java:449)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater(PlatformImpl.java:418)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater(PlatformImpl.java:417)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop(WinApplication.java:175)
... 1 more
Caused by: java.lang.InstantiationException
at java.base/jdk.internal.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:48)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:488)
at java.base/java.lang.Class.newInstance(Class.java:560)
at javafx.fxml/javafx.fxml.FXMLLoader$InstanceDeclarationElement.constructValue(FXMLLoader.java:1019)
... 20 more
Exception running application game.Main
Process finished with exit code 1
World是抽象的，不能构造抽象的实例class.
当你声明一个元素时：
<World ...>
在 FXML 中，当您加载 FXML 文档时，FXMLLoader 将尝试创建 World class 的实例。当它这样做时，它将失败，因为 World 是抽象的，无法实例化。
您的代码或设计中可能还有其他问题，但至少有此处指出的问题。
if i want to make an instance of it but it extend AnchorPane how do i go about that?
你不能，你的 class 层次结构已经由你的 extends 子句定义，除非你改变层次结构设计（例如重新编码 World 所以它不是抽象的），你必须实例化一个具体的子class 的世界。
I have another class that extends world that isn't abstract so i should use that instead i guess?
是的。
对于一个项目，我得到了代码并且不得不将其重构为 FXML，我正在尝试使用一段代码，它是 AnchorPane 的扩展，但是当我将它从 AnchorPane 切换到我的世界时FXML 我在 Scene Builder 中遇到错误，当我 运行 它时。我已经尝试了很多东西，只是有点难过，不知道现在该尝试什么。我注释掉了 World 的原始构造函数，但可以 post 如果它可能相关
世界：
package game;
import javafx.animation.AnimationTimer;
import javafx.scene.Node;
import javafx.scene.layout.AnchorPane;
import java.util.ArrayList;
import java.util.List;
public abstract class World extends AnchorPane {
private AnimationTimer timer;
public void createTimer() {
timer = new AnimationTimer() {
@Override
public void handle(long now) {
act(now);
List<Actor> actors = getObjects(Actor.class);
for (Actor anActor: actors) {
anActor.act(now);
}
}
};
}
public void start() {
createTimer();
timer.start();
}
public void stop() {
timer.stop();
}
public void add(Actor actor) {
getChildren().add(actor);
}
public void remove(Actor actor) {
getChildren().remove(actor);
}
public <A extends Actor> List<A> getObjects(Class<A> cls) {
ArrayList<A> someArray = new ArrayList<A>();
for (Node n: getChildren()) {
if (cls.isInstance(n)) {
someArray.add((A)n);
}
}
return someArray;
}
public abstract void act(long now);
}
FXML
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.image.*?>
<?import javafx.scene.layout.*?>
<?import game.End?>
<?import game.Log?>
<?import game.WetTurtle?>
<?import game.Turtle?>
<?import game.Obstacle?>
<?import game.World?>
<World maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity"
prefHeight="800.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/10.0.2-internal"
xmlns:fx="http://javafx.com/fxml/1" fx:controller="game.Level1Controller">
<ImageView>
<image>
<Image url="@../backgrounds/frogbg.png" />
</image>
</ImageView>
<End layoutX="13.0" layoutY="138.8">
<image>
<Image url="@../end/End.png" />
</image></End>
<End layoutX="141.0" layoutY="138.0">
<image>
<Image url="@../end/End.png" />
</image>
</End>
<End layoutX="269.0" layoutY="138.0">
<image>
<Image url="@../end/End.png" />
</image>
</End>
<End layoutX="398.0" layoutY="138.0">
<image>
<Image url="@../end/End.png" />
</image>
</End>
<End layoutX="528.0" layoutY="138.0">
<image>
<Image url="@../end/End.png" />
</image>
</End>
<Log fitHeight="30.0" layoutY="209.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../log/log3.png" />
</image>
</Log>
<Log fitHeight="30.0" layoutX="220.0" layoutY="209.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../log/log3.png" />
</image>
</Log>
<Log fitHeight="30.0" layoutX="440.0" layoutY="209.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../log/log3.png" />
</image>
</Log>
<WetTurtle fitHeight="45.0" layoutX="600.0" layoutY="252.0" preserveRatio="true">
<image>
<Image url="@../turtle/TurtleAnimation1.png" />
</image>
</WetTurtle>
<WetTurtle fitHeight="45.0" layoutX="400.0" layoutY="252.0" preserveRatio="true">
<image>
<Image url="@../turtle/TurtleAnimation1.png" />
</image>
</WetTurtle>
<WetTurtle fitHeight="45.0" layoutX="200.0" layoutY="252.0" preserveRatio="true">
<image>
<Image url="@../turtle/TurtleAnimation1.png" />
</image>
</WetTurtle>
<Log fitHeight="35.0" layoutY="308.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../log/logs.png" />
</image>
</Log>
<Log fitHeight="35.0" layoutX="440.0" layoutY="308.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../log/logs.png" />
</image>
</Log>
<Log fitHeight="35.0" layoutX="50.0" layoutY="358.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../log/log3.png" />
</image>
</Log>
<Log fitHeight="35.0" layoutX="270.0" layoutY="358.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../log/log3.png" />
</image>
</Log>
<Log fitHeight="35.0" layoutX="490.0" layoutY="358.0" pickOnBounds="true" preserveRatio="true">
<image>
<Image url="@../log/log3.png" />
</image>
</Log>
<Turtle fitHeight="45.0" layoutX="500.0" layoutY="402.0" preserveRatio="true">
<image>
<Image url="@../turtle/TurtleAnimation1.png" />
</image></Turtle>
<Turtle fitHeight="45.0" layoutX="300.0" layoutY="402.0" preserveRatio="true">
<image>
<Image url="@../turtle/TurtleAnimation1.png" />
</image>
</Turtle>
<WetTurtle fitHeight="45.0" layoutX="700.0" layoutY="402.0" preserveRatio="true">
<image>
<Image url="@../turtle/TurtleAnimation1.png" />
</image>
</WetTurtle>
<Obstacle fitHeight="28.0" layoutX="500.0" layoutY="511.0" preserveRatio="true">
<image>
<Image url="@../car/car1Left.png" />
</image>
</Obstacle>
<Obstacle fitHeight="35.0" layoutX="500.0" layoutY="557.0" preserveRatio="true">
<image>
<Image url="@../truck/truck2Right.png" />
</image>
</Obstacle>
<Obstacle fitHeight="35.0" layoutY="557.0" preserveRatio="true">
<image>
<Image url="@../truck/truck2Right.png" />
</image>
</Obstacle>
<Obstacle fitHeight="28.0" layoutX="550.0" layoutY="611.0" preserveRatio="true">
<image>
<Image url="@../car/car1Left.png" />
</image>
</Obstacle>
<Obstacle fitHeight="28.0" layoutX="400.0" layoutY="611.0" preserveRatio="true">
<image>
<Image url="@../car/car1Left.png" />
</image>
</Obstacle>
<Obstacle fitHeight="28.0" layoutX="250.0" layoutY="611.0" preserveRatio="true">
<image>
<Image url="@../car/car1Left.png" />
</image>
</Obstacle>
<Obstacle fitHeight="28.0" layoutX="100.0" layoutY="611.0" preserveRatio="true">
<image>
<Image url="@../car/car1Left.png" />
</image>
</Obstacle>
<Obstacle fitHeight="35.0" layoutX="600.0" layoutY="657.0" preserveRatio="true">
<image>
<Image url="@../truck/truck1Right.png" />
</image>
</Obstacle>
<Obstacle fitHeight="35.0" layoutX="300.0" layoutY="657.0" preserveRatio="true">
<image>
<Image url="@../truck/truck1Right.png" />
</image>
</Obstacle>
<Obstacle fitHeight="35.0" layoutY="657.0" preserveRatio="true">
<image>
<Image url="@../truck/truck1Right.png" />
</image>
</Obstacle>
</World>
错误
Exception in Application start method
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:473)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:372)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:941)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:973)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication(LauncherImpl.java:198)
at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: javafx.fxml.LoadException:
/C:/Users/harry/IdeaProjects/Frogger%20Game/out/production/Frogger%20Game/game/fxml/level1.fxml:16
at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2625)
at javafx.fxml/javafx.fxml.FXMLLoader.access0(FXMLLoader.java:105)
at javafx.fxml/javafx.fxml.FXMLLoader$InstanceDeclarationElement.constructValue(FXMLLoader.java:1021)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:754)
at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2722)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3253)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3210)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3179)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3152)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3129)
at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3122)
at Frogger.Game/game.Main.start(Main.java:25)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1(LauncherImpl.java:919)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait(PlatformImpl.java:449)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater(PlatformImpl.java:418)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater(PlatformImpl.java:417)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop(WinApplication.java:175)
... 1 more
Caused by: java.lang.InstantiationException
at java.base/jdk.internal.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:48)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:488)
at java.base/java.lang.Class.newInstance(Class.java:560)
at javafx.fxml/javafx.fxml.FXMLLoader$InstanceDeclarationElement.constructValue(FXMLLoader.java:1019)
... 20 more
Exception running application game.Main
Process finished with exit code 1
World是抽象的，不能构造抽象的实例class.
当你声明一个元素时：
<World ...>
在 FXML 中，当您加载 FXML 文档时，FXMLLoader 将尝试创建 World class 的实例。当它这样做时，它将失败，因为 World 是抽象的，无法实例化。
您的代码或设计中可能还有其他问题，但至少有此处指出的问题。
if i want to make an instance of it but it extend AnchorPane how do i go about that?
你不能，你的 class 层次结构已经由你的 extends 子句定义，除非你改变层次结构设计（例如重新编码 World 所以它不是抽象的），你必须实例化一个具体的子class 的世界。
I have another class that extends world that isn't abstract so i should use that instead i guess?
是的。