eclipse Apache 公共集合的奇怪问题
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Strange issue with Apache common collection
提问by Umesh Awasthi
I am not sure what might be the cause of this issue but i am facing it since morning and seems like i am doing something wrong or i have done something wrong with my Eclipse IDE
我不确定这个问题的原因是什么，但我从早上开始就面临这个问题，似乎我做错了什么，或者我的 Eclipse IDE 做错了什么
i have included Apache commom collection is my project using maven as follow
我已经包括 Apache commom 集合是我使用 maven 的项目，如下所示
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
<version>3.2.1</version>
</dependency>
Depedency is getting included correctly, but when i am trying to use following method of collection util
依赖被正确包含，但是当我尝试使用以下收集 util 方法时
MapUtils.isEmpty(java.util.Map map)
or
MapUtils.isNotEmpty(java.util.Map map)
They are not being shown in the editor and only method i can see under MapUtil is
它们没有显示在编辑器中，我在 MapUtil 下可以看到的唯一方法是
invertMap(java.util.Map map)
i check the import statement in Eclipse and its
我检查了 Eclipse 中的导入语句及其
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.collections.MapUtils;
Not sure where things are going wrong as i have used above utility method number of times, do any one have any clue
不知道哪里出了问题，因为我已经多次使用上述实用程序方法，有没有人有任何线索
采纳答案by Caesar Ralf
Are you sure it's 3.2.1 you are using? Check from where the import is comming from. You maybe having some conflict, because one of your libs is importing another version of apache.commons.
您确定您使用的是 3.2.1 吗？检查导入的来源。您可能有一些冲突，因为您的一个库正在导入另一个版本的 apache.commons。
Try importing "org.apache.commons.collections.MapUtils" and see if there's still a problem.
尝试导入“org.apache.commons.collections.MapUtils”，看看是否还有问题。
回答by randominstanceOfLivingThing
Your import is correct. CollectionUtils ( http://commons.apache.org/collections/apidocs/index.html?org/apache/commons/collections/CollectionUtils.html) has methods
您的导入是正确的。CollectionUtils ( http://commons.apache.org/collections/apidocs/index.html?org/apache/commons/collections/CollectionUtils.html) 有方法
CollectionUtils.isEmpty(java.util.Map map)
CollectionUtils.isNotEmpty(java.util.Map map)
You are just looking int the wrong class MapUtils.
您只是在寻找错误的类 MapUtils。
