Javac-d标志不能创建文件夹。-Javac-dflagcantcreatefolder

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It's clearly said that the directory must already exist; javac will not create it.

显然，这个目录必须已经存在;javac不会创建它。

-d directory

- d目录

Set the destination directory for class files. The directory must already exist; javac will not create it. If a class is part of a package, javac puts the class file in a subdirectory reflecting the package name, creat‐ ing directories as needed. For example, if you specify -d /home/myclasses and the class is called com.mypackage.MyClass, then the class file is called /home/myclasses/com/mypackage/MyClass.class. If -d is not specified, javac puts each class files in the same directory as the source file from which it was generated.

为类文件设置目标目录。目录必须已经存在;javac不会创建它。如果类是包的一部分，javac将类文件放在子目录中，该子目录反映包名，根据需要创建目录。例如，如果您指定-d /home/myclass，并且该类被称为com.mypackage。然后类文件被称为/home/myclasses/com/mypackage/MyClass.class。如果没有指定-d, javac将每个类文件放在与生成它的源文件相同的目录中。

Note: The directory specified by -d is not automatically added to your user class path.

注意:-d指定的目录不会自动添加到用户类路径中。