从groovy中访问java类 [英] access a java class from within groovy
问题描述
我有一个简单的java类:
I have a simple java class:
package test;
class Hello {
public static void main(String[] args) {
System.out.println("Hi");
}
}
我做了一个
javac Hello.java
问题:现在我想从一个groovy脚本(access.groovy)访问这个类...
Problem: Now I would like to access this class from a groovy script (access.groovy) ...
import test.*
Hello.main(null)
但是
but
groovy -cp . access.groovy
会导致 MissingPropertyException
。我做错了什么?
will result in a MissingPropertyException
. What am I doing wrong?
推荐答案
您的课程 Hello
需要宣布为公开可从其他软件包访问。作为一种动态语言,Groovy无法识别这样的错误,并最终寻找一个名为 Hello
的变量。
Your class Hello
needs to be declared as public to be accessible from other packages. As a dynamic language, Groovy can't identify such errors and ends up looking for a variable named Hello
.
使用通配符导入通常是一个糟糕的主意;在这种情况下,使用 import test.Hello;
会给你一个更好的错误信息。
It's generally a bad idea to use wildcard imports; in this case, using import test.Hello;
would have given you a better error message.
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