Java 包 org.apache.commons.lang 不存在 [Netbeans]
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package org.apache.commons.lang does not exist [Netbeans]
提问by Mo Arctic
Am new to programming with basic knowledge and I've taken a liken to Java.
I wanted to write a code that calculates a number to the nth power without using loops. I've been trying to use the repeat method from "commons lang" which i came to know about, about 4 days ago. I Found a lot of info in this site and others that helped me in understanding how to use this packed.
So far I downloaded commons-lang3-3.1 then kept the folder in the same folder as my project and added the jar file to my project's library by:-
我是具有基本知识的编程新手，我将其与 Java 进行了比较。
我想编写一个代码，在不使用循环的情况下计算一个数的 n 次方。我一直在尝试使用大约 4 天前我了解到的“commons lang”中的重复方法。我在这个网站和其他网站上找到了很多信息，这些信息帮助我了解如何使用这个包装。
到目前为止，我下载了 commons-lang3-3.1，然后将该文件夹保存在与我的项目相同的文件夹中，并通过以下方式将 jar 文件添加到我的项目库中：-
right clicking on libraries
1 then Add JAR/Folder
2 then i opened the commons-lang3-3.1 folder
3 and selected "commons-lang3-3.1.jar" from a number of 4 selections:
右键单击库
1 然后添加 JAR/文件夹
2 然后我打开了 commons-lang3-3.1 文件夹
3 并从 4 个选项中选择了“commons-lang3-3.1.jar”：
- commons-lang3-3.1.jar
- commons-lang3-3.1-javadoc.jar
- commons-lang3-3.1-sources.jar
- commons-lang3-3.1-tests.jar
- commons-lang3-3.1.jar
- commons-lang3-3.1-javadoc.jar
- commons-lang3-3.1-sources.jar
- commons-lang3-3.1-tests.jar
here is a code that am using to test that i got from one of the the other questions:-
这是用于测试我从其他问题之一中得到的代码：-
0. package refreshingmemory;
1. import org.apache.commons.lang.StringUtils;
2. public class RefreshingMemory {
3.
4. public static void main(String[] args) {
5. String str = "abc";
6. String repeated = StringUtils.repeat(str, 3);
7. repeated.equals("abcabcabc");
8.
9. }
10. }
line 1 says package org.apache.commons.lang does not exist.
line 7 says Should check the method return value
and if i remove line 1 i get a cannot find symbolat line 6
How do I get a successfully import ?
第 1 行表示包 org.apache.commons.lang 不存在。
第 7 行说应该检查方法返回值
，如果我删除第 1 行，我会在第 6 行得到一个无法找到的符号
如何成功导入？
Screenshot of Netbeans:
Netbeans 截图：
采纳答案by predi
http://commons.apache.org/proper/commons-lang/states the following:
http://commons.apache.org/proper/commons-lang/声明如下：
Note that Lang 3.0 (and subsequent versions) use a different package (org.apache.commons.lang3) than the previous versions (org.apache.commons.lang), allowing it to be used at the same time as an earlier version.
需要注意的是郎3.0（以及后续版本）使用不同的包（org.apache.commons.lang3比以前的版本（org.apache.commons.lang）），使其能够在同一时间较早的版本使用。
So change the package accordingly, or heed Richard Tingle's advice and left click the error+light bulb icon in the gutter (were line numbers are shown) and choose "Add import for...".
因此，相应地更改包，或者听从 Richard Tingle 的建议并左键单击装订线中的错误+灯泡图标（显示行号）并选择“为...添加导入”。
import org.apache.commons.lang3.StringUtils;
