java 为什么我不能导入 org.apache.commons.lang.StringUtils？
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How come I can't import org.apache.commons.lang.StringUtils?
提问by user3435009
I added the common lang jar file in the classpath, but when I compile it says:
我在类路径中添加了 common lang jar 文件，但是当我编译它时说：
error: package org.apache.commons.lang does not exist
错误：包 org.apache.commons.lang 不存在
I tried to follow the steps described below:
我尝试按照下面描述的步骤操作：
http://oopbook.com/java-classpath-2/classpath-in-jcreator/
http://oopbook.com/java-classpath-2/classpath-in-jcreator/
but I don't it doesn't work. Is it the editor that's not working properly or is it something else?
但我不知道这是行不通的。是编辑器工作不正常还是其他原因？
回答by azurefrog
Between major versions 2 and 3 apache changed the package naming scheme on their classes from langto lang3.
在主要版本 2 和 3 之间，apache 将其类的包命名方案从lang更改为lang3。
Notice on the download site that for version 2.6 you are downloading "commons-lang-2.6" and for version 3.3.2 you are downloading "commons-lang3-3.3.2".
请注意，在下载站点上，对于 2.6 版，您正在下载“commons- lang-2.6”，对于 3.3.2 版，您正在下载“commons- lang3-3.3.2”。
Also, if you check out the current API docyou'll see the new naming structure.
此外，如果您查看当前的 API 文档，您将看到新的命名结构。
All you need to do is update your import statement to match the new package structure and your compiler will be able resolve it correctly.
您需要做的就是更新您的导入语句以匹配新的包结构，您的编译器将能够正确解析它。
