我是 Javafx 的新手，我剛剛下載了 JDK 12 并遵循了教程，它有效但對我不起作用，（我正在使用模塊來要求 javafx.controls）這里是代碼：在我的主類中：我在 SOFlow 中嘗試了很多解決方案但沒有結果，我嘗試了：1）將 public 關鍵字添加到我的類中 2）刪除了主要方法仍然不起作用幫助？package com.teachersdunet.hellojavafx;import javafx.application.Application;import javafx.stage.Stage;public class HelloApp extends Application { public static void main(String[] args) { Application.launch(args); } @Override public void start(Stage primaryStage) throws Exception { }}這是執行后的錯誤：Exception in Application constructorException in thread "main" 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:567) at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)Caused by: java.lang.RuntimeException: Unable to construct Application instance: class com.teachersdunet.hellojavafx.HelloApp at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:890) at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195) at java.base/java.lang.Thread.run(Thread.java:835)Caused by: java.lang.IllegalAccessException: class com.sun.javafx.application.LauncherImpl (in module javafx.graphics) cannot access class com.teachersdunet.hellojavafx.HelloApp (in module com.teachersdunet.hellojavafx) because module com.teachersdunet.hellojavafx does not export com.teachersdunet.hellojavafx to module javafx.graphics ... 1 more
2 回答
牛魔王的故事
TA貢獻1830條經驗 獲得超3個贊
解決方案幾乎在堆棧跟蹤中提到；問題縮小到它告訴您缺少的導出的程度：
...
Caused by: java.lang.IllegalAccessException: class com.sun.javafx.application.LauncherImpl (in module javafx.graphics) cannot access class com.teachersdunet.hellojavafx.HelloApp (in module com.teachersdunet.hellojavafx) because module com.teachersdunet.hellojavafx does not export com.teachersdunet.hellojavafx to module javafx.graphics
...
將以下行添加到com.teachersdunet.hellojavafx模塊中：
module com.teachersdunet.hellojavafx {
...
exports com.teachersdunet.hellojavafx;
}
或者只授予對單個模塊的訪問權限：
module com.teachersdunet.hellojavafx {
...
exports com.teachersdunet.hellojavafx to javafx.graphics;
}
胡子哥哥
TA貢獻1825條經驗 獲得超6個贊
你會收到這樣的錯誤，因為你沒有在 start 方法中調用任何東西。您必須設置Scene并提供FXML文件的目錄。
我已經更正了你的代碼。
package com.teachersdunet.hellojavafx;
import javafx.application.Application;
import javafx.stage.Stage;
public class HelloApp extends Application {
@Override
public void start(Stage primaryStage) throws Exception {
try {
Parent root = FXMLLoader.load(getClass().getResource("directory_of_your_fxml_file"));
Scene scene = new Scene(root);
primaryStage.setScene(scene);
primaryStage.show();
} catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}
我希望這有幫助。
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