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我正在尝试创建一个 java 学习 android 应用程序。它应该有一个供用户使用的代码游乐场；可以运行简单的java代码。我将用户代码保存在 java 代码中并尝试运行它。我正在使用 JANINO ，但问题是我无法加载包括用户代码在内的外部类。这是我的代码；

String UsersCodeInput;
public void Run() throws FileNotFoundException, IOException
{

    File sourcepath = new File(Environment.getExternalStorageDirectory()+"/MainFolder");
    File JavaFile = new File(sourcepath.getPath()+"A.java");
    FileOutputStream fos = new FileOutputStream(JavaFile);
    fos.write(UsersCodeInput.getBytes());
    fos.close();
    // now Users Code is Saved.
    //trying to run it by means of janino :

    ClassLoader cl = new JavaSourceClassLoader(
        this.getClass().getClassLoader(),  // parentClassLoader
        new File[] {sourcepath}, //our sourceFolder
        "UTF-8" //Encodeing                    
    );

    try
    {
        // problem is here. next line is not working well; throws classNotFound.
        Object o = cl.loadClass(".A").newInstance();
        //the class implements runnable.
        ((Runnable) o).run();
    }
    catch (ClassNotFoundException e)
    {Toast.makeText(this,e.getCause().toString(),Toast.LENGTH_SHORT).show();}
    catch (InstantiationException e)
    {Toast.makeText(this,e.getCause().toString(),Toast.LENGTH_SHORT).show();}
    catch (IllegalAccessException e)
    {Toast.makeText(this,e.getCause().toString(),Toast.LENGTH_SHORT).show();}

}

这是 JANINOs 教程；阅读“源代码编译器”部分 http://janino-compiler.github.io/janino/

谢谢。

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