Groovy：为什么在同一个包中的类需要导入？ [英] Groovy: Why is Import required for classes in the same package?

问题描述

一个包中的简单Groovy类 com.something

  package com.something 
 
 class A {
} 
  

同一个包中的另一个类

  package com.something 
 
 class B {
 def variable = new A（）/ /不工作，直到我明确地说import com.something.A
} 
  

为什么B类无法访问类A，即使它们都在同一个包中？解析方案

可悲的是，问题确实如此没有真正需要的信息来完全回答它。但我可以告诉以下几点。如果你在那里建立一个目录./com/something/并将A.groovy和B.groovy写出来，然后使用命令行 groovyc ./com/something/A.groovy ./com/something进行编译/B.groovy ，那么这个必须工作。到目前为止，该目录并不重要，但如果您更改为 groovyc ./com/something/B.groovy ，则目录会发生变化，因为现在groovyc必须发现A. groovy并且需要正确的目录结构。

现在，groovyc的ant，gradle和maven版本通常如何工作，是提供一个完整的源代码列表。如果没有这样做，编译可能会失败。但是，如果A和B的根目录不同，并且你不给这两个编译器，那么它肯定会失败。

我不知道这是否是原因，所以我希望将这个答案更多地理解为指向可能错误的指针。希望这有助于

A simple Groovy Class in a package com.something

package com.something

class A {
}

Another class in the same package

package com.something

class B {
    def variable=new A() //DOES NOT WORK TILL I EXPLICITLY say "import com.something.A"
}

Why Class B is not able to access class A, even though they both are in the same package?

解决方案

Sadly the question does not really have the needed information to answer it completely. But I can tell the following. If you make a directory ./com/something/ and out A.groovy and B.groovy in there and then compile them using the commandline groovyc ./com/something/A.groovy ./com/something/B.groovy, then this must work. So far the directory is not really important, but that changes if you change to groovyc ./com/something/B.groovy, because now groovyc has to "discover" A.groovy and requires the correct directory structure for this.

Now, how the ant, gradle and maven version of groovyc normally work is by supplying a complete list of sources. If this is not done, compilation may fail. But if the root directories for A and B are different and you do not give both to the compiler, then it will surely fail.

I cannot know if that is the reason, so I want this answer more understood as a pointer to what might be wrong. Hope this helps

这篇关于Groovy：为什么在同一个包中的类需要导入？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！