缺少JavaFX应用程序类 [英] Missing JavaFX application class

问题描述

我有这样的Java代码:

I have java code like this:

package mypackage;

import javafx.application.Application;
import javafx.stage.Stage;

public class MyApp extends Application{
    public static void main(String args[]){
        launch(args);
    }
    public void start(Stage primaryStage){
        primaryStage.show();
    }
}

，我已经在~/myjava/src/mypackage/MyApp.class对其进行了编译. 然后，当我从

and I've compiled it at ~/myjava/src/mypackage/MyApp.class . then, when I'm running from

~$ java -cp myjava/src mypackage/MyApp

为什么会出现错误，如:

why getting error like:

Missing JavaFX application class mypackage/MyApp

我正在使用JDK 8.

I'm using JDK 8.

推荐答案

这是因为您使用目录路径而不是完全限定的类名来调用应用程序.完全限定的类名由包名和类名组成.您的情况是mypackage.MyApp.

That is because you are calling your application with a directory path instead of the fully qualified classname. The fully qualified classname is composed from the package name and the class name. In your case this is mypackage.MyApp.

假定编译的类与源.java文件位于同一文件夹中，请按以下方式调用它:

Assuming that your compiled class resides in the same folder as the source .java file, call it this way:

java -cp myjava/src mypackage.MyApp

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