软件包org.apache.commons.lang不存在[Netbeans] [英] package org.apache.commons.lang does not exist [Netbeans]

问题描述

是使用基础知识进行编程的新手，我已将其比作Java.
我想编写一个无需循环即可计算n次幂的数字的代码.大约4天前，我一直在尝试使用"commons lang"中的重复方法.我在此站点和其他站点中找到了很多信息，这些信息有助于我了解如何使用此打包产品.
到目前为止，我下载了commons-lang3-3.1，然后将该文件夹保留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的库中:-

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:-

右键单击库
1然后添加JAR/文件夹
2然后我打开commons-lang3-3.1文件夹
3，然后从4个选择中选择"commons-lang3-3.1.jar":

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:

• 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

    这是用于测试我是否从其他问题之一获得的代码:-

    here is a code that am using to test that i got from one of the the other questions:-

    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.    }
    

    第1行说软件包org.apache.commons.lang不存在.
    第7行说应该检查方法的返回值
    如果我删除第1行，则会在第6行出现找不到符号
    如何成功导入?

    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 symbol at line 6
    How do I get a successfully import ?

    Netbeans的屏幕截图:

    Screenshot of Netbeans:

    推荐答案

    http://commons.apache.org/normal/commons-lang/指出以下内容:

    请注意，Lang 3.0(及后续版本)使用的软件包( org.apache.commons.lang3 )与以前的版本(org.apache.commons.lang)不同.与早期版本同时使用.

    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.

    因此，请相应地更改包装，或者听从理查德·廷格(Richard Tingle)的建议，然后在装订线中单击错误+灯泡图标(显示行号)，然后选择为...添加导入".

    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...".

    import org.apache.commons.lang3.StringUtils;
    

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