是否可能有.java和.scala类之间的循环依赖？ [英] is it possible to have a circular dependency between .java and .scala classes?

问题描述

假设我在.java文件中定义了类A，在.scala文件中定义了类B.

类A使用类B，类B使用类A.

如果我使用java编译器，我将有一个编译错误，因为类B尚未编译。如果我使用scala编译器类A将不会被找到。是否有编译器可以一起编译？

Lets say I have class A defined in .java file, and class B defined in .scala file.
class A use class B and class B use class A.
If I use java compiler I will have a compilation error because class B is not compiled yet. If I use scala compiler class A will not be found. Is there a compiler that can compile both together?

推荐答案

我认为Scala 2.7.2引入了联合编译模式来做到这一点？

I thought that Scala 2.7.2 introduced a joint compilation mode to do exactly this?

您正在使用哪个版本的 scalac ，并且该模式是否已停用？

Which version of scalac are you using, and is it running with this mode disabled?

编辑：等一下，当你说scalac导致A类没有被发现 - 你是否意识到你仍然需要编译纯Java文件与 javac 后来？ Scalac的联合编译模式实际上不会为Java文件生成 *。class 输出，只是将Scala类与其签名进行编译。因此，你仍然需要编译Java文件后，虽然这不应该是 javac 现在Scala类已经编译的问题。

Wait a second, when you say scalac leads to Class A not being found - did you realise that you still need to compile the pure Java files with javac afterwards? Scalac's joint compilation mode doesn't actually produce *.class output for the Java files, merely compiles the Scala classes against their signatures. Hence you still need to compile the Java files afterwards, though this shouldn't be a problem for javac now that the Scala classes have been compiled.

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