blocks|key|125816|text|搜索环境变量。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|125817|📷|atomic|offset|length|125818|​|125819|打开“编辑系统环境变量”。然后点击“环境变量”。|125820|125821|125822|在“用户变量”下，单击“路径”，然后单击“编辑”。|125823|125824|125825|找到您的Java路径，然后单击“编辑”。|125826|125827|125828|然后粘贴java安装文件夹的路径。大多数情况下，您可以在类似于下面的路径中找到它。C:\Program+Files\Java\jdk-12.0.2\bin|125829|然后单击OK。现在，在开始菜单中，键入cmd。打开命令提示符。输入java+-version如果你做得对，它应该显示如下所示。|125830|125831|125832|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/45b58e0b4b276d11d9ff1db7032b2b8f.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/ca88686d499b930e7f8072d978de595b.png|2|https://ask.qcloudimg.com/http-save/yehe-900000/64347d875e38c69202e794b8d48d6622.png|3|https://ask.qcloudimg.com/http-save/yehe-900000/b9d713d471614d481baf99520ba3affd.png|4|https://ask.qcloudimg.com/http-save/yehe-900000/dffdf2bd87a51e18f6b7f7ff1f323e51.png^0|0|0|1|0|0|0|0|0|1|1|0|0|0|0|1|2|0|0|0|0|1|3|0|0|0|0|0|1|4|0|0^^$0|@$1|2|3|4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1I|8|@]|9|@$E|1J|F|1K|1|1L]]|A|$]]|$1|G|3|H|5|6|7|1M|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|1N|8|@]|9|@]|A|$]]|$1|K|3|C|5|D|7|1O|8|@]|9|@$E|1P|F|1Q|1|1R]]|A|$]]|$1|L|3|H|5|6|7|1S|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1T|8|@]|9|@]|A|$]]|$1|O|3|C|5|D|7|1U|8|@]|9|@$E|1V|F|1W|1|1X]]|A|$]]|$1|P|3|H|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|S|3|C|5|D|7|20|8|@]|9|@$E|21|F|22|1|23]]|A|$]]|$1|T|3|H|5|6|7|24|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|25|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|26|8|@]|9|@]|A|$]]|$1|Y|3|C|5|D|7|27|8|@]|9|@$E|28|F|29|1|2A]]|A|$]]|$1|Z|3|H|5|6|7|2B|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|2C|8|@]|9|@]|A|$]]]|11|$12|$5|13|14|15|A|$16|17|18|-4]]|19|$5|13|14|15|A|$16|1A|18|-4]]|1B|$5|13|14|15|A|$16|1C|18|-4]]|1D|$5|13|14|15|A|$16|1E|18|-4]]|1F|$5|13|14|15|A|$16|1G|18|-4]]]]

Search environment variables.
<a href="https://i.stack.imgur.com/IiQI3.png" rel="noreferrer"><img src="https://i.stack.imgur.com/IiQI3.png" alt="enter image description here"></a>

open the "edit the system environment variables".
then click on "environment variables".
<a href="https://i.stack.imgur.com/nA5Ap.png" rel="noreferrer"><img src="https://i.stack.imgur.com/nA5Ap.png" alt="enter image description here"></a>

Under "User variables" click on "Path" then "Edit".
<a href="https://i.stack.imgur.com/DY5IP.png" rel="noreferrer"><img src="https://i.stack.imgur.com/DY5IP.png" alt="enter image description here"></a>

Find your Java path and click "Edit".
<a href="https://i.stack.imgur.com/KM2hL.png" rel="noreferrer"><img src="https://i.stack.imgur.com/KM2hL.png" alt="enter image description here"></a>

then paste the path of your java installation folder.
Mostly you can find it on a path similar to this.
C:\Program Files\Java\jdk-12.0.2\bin

Then click OK.
now in the start menu, type cmd.
open the command prompt.
type
java -version
If you did it right,it should show something like this.
<a href="https://i.stack.imgur.com/G4yfe.png" rel="noreferrer"><img src="https://i.stack.imgur.com/G4yfe.png" alt="enter image description here"></a>

blocks|key|343212|text|对我来说，它在系统变量path的开头放入，：之后开始工作:--|type|unstyled|depth|inlineStyleRanges|entityRanges|data|343213|📷|atomic|offset|length|343214|​|343215|343216|343217|343218|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/6d0cf3423a6a93939dcef29995e994c2.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/f2b9b3cfc68e936dfc927e77f93e80c9.png^0|0|0|1|0|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@$E|Y|F|Z|1|10]]|A|$]]|$1|G|3|H|5|6|7|11|8|@]|9|@]|A|$]]|$1|I|3|H|5|6|7|12|8|@]|9|@]|A|$]]|$1|J|3|C|5|D|7|13|8|@]|9|@$E|14|F|15|1|16]]|A|$]]|$1|K|3|H|5|6|7|17|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S|T|-4]]|U|$5|O|P|Q|A|$R|V|T|-4]]]]

For me its start working after putting ,: in the starting of the system variable path :-- 
<img src="https://i.stack.imgur.com/w7GDm.png" alt="enter image description here">

<img src="https://i.stack.imgur.com/1ZfdF.png" alt="enter image description here">

blocks|key|125410|text|我的解决方案是在JAVA_HOME和Path中放置相同的值(+JDK+bin文件夹的路径|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|125411|​|125412|📷|atomic|125413|125414|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/a5137f46b7091057548f0896c6f78c03.jpeg|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/23eb8667203b001bbdc318901663dbfb.jpeg^0|8|9|I|4|0|0|0|1|0|0|0|1|1|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|12|8|@]|D|@$9|13|A|14|1|15]]|E|$]]|$1|K|3|I|5|J|7|16|8|@]|D|@$9|17|A|18|1|19]]|E|$]]|$1|L|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S|T|-4]]|U|$5|O|P|Q|E|$R|V|T|-4]]]]

My solution was to put same value (path to JDK bin folder) in <code>JAVA_HOME</code> and <code>Path</code>

<img src="https://i.stack.imgur.com/Hk7QVm.png" alt="JAVA_HOME"> 
<img src="https://i.stack.imgur.com/LoBnUm.png" alt="Path">

blocks|key|125293|text|在我的例子中，PATH被正确设置，但是PATHEXT被我用.exe扩展错误地清除了。这就是为什么window在命令提示符下找不到java或任何.exe应用程序原因。希望它能帮助到一些人。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|125294|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my case, PATH was properly SET but PATHEXT has been cleared by me by mistake with .exe extension. That why window can't find java or anything .exe application from command prompt. Hope it can help someone.

blocks|key|125445|text|我也有同样的问题。只需安装与您计算机完全相同的java即可。如果你的PC是64位的，那么安装64位的java。如果是32位，则反之亦然:)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|125446|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I had the same problem. Just Install the exact bit of java as of your computer. If your PC is 64 bit then install 64 bit java. If it is 32 bit then vice versa :)

blocks|key|343380|text|不知道为什么，但在我的例子中，原因是因为我运行的是Anaconda终端，而不是CMD。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|343381|在我使用CMD并更新路径设置后，上面的所有评论都提到了我这边解决了这个问题。|343382|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Not sure why, but in my case, the reason was because I was running Anaconda terminal instead of the CMD.

After I use CMD and update the path settings as mentioned by all comments above the issue solved on my side.

blocks|key|343749|text|在更新了环境变量后，我在Windows10中打开了一个新的命令提示符，而没有关闭旧的环境变量(为了让我的命令方便且懒惰地再次键入)，新的cmd窗口仍然引用了以前版本的Java。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|343750|然后，一旦我关闭了所有以管理员权限运行的cmd提示符，新的java版本就会得到反映。|343751|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I opened a new command prompt in Windows 10 after updating the environment variables without closing the old one(To have my commands handy and lazy to type again)
Still, the new cmd window was referring to the previous version of Java.
Then once I closed the all cmd prompts that ran with admin privileges, the new java version was getting reflected.

blocks|key|343118|text|如果您在Windows+Box中安装了cygwin，或者使用UNIX+Shell，则|type|unstyled|depth|inlineStyleRanges|entityRanges|data|343119|Issue+bash#which+java|code-block|syntax|javascript|343120|这将告诉您java是否在您的类路径中。|343121|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

if you have cygwin installed in the Windows Box, or using UNIX Shell then 

<pre><code>Issue bash#which java
</code></pre>

This will tell you whether java is in your classpath or NOT.

blocks|key|343685|text|如果您在用户变量下设置了环境变量(JAVA_HOME和PATH)，命令提示符(以管理员身份运行)将无法识别java。为此，您需要在系统变量下设置环境变量。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|343686|entityMap^0|H|9|R|4|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

If you have set the environment variables (<code>JAVA_HOME</code> and <code>PATH</code>) under user variables, command prompt (run as administrator) will not identify java. For that you need to set environment variables under system variables.

blocks|key|125921|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|125922|系统变量:+PATH+=+jdk安装的/bin文件夹|125923|https://docs.oracle.com/javase/10/install/installation-jdk-and-jre-microsoft-windows-platforms.htm|offset|length|125924|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|2Q|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@$F|R|G|S|1|T]]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|E]]]]

Try this:
System variables:
PATH = /bin folder of your jdk install
<a href="https://docs.oracle.com/javase/10/install/installation-jdk-and-jre-microsoft-windows-platforms.htm" rel="nofollow noreferrer">https://docs.oracle.com/javase/10/install/installation-jdk-and-jre-microsoft-windows-platforms.htm</a>

blocks|key|125975|text|对于仍然有问题的人，只需要一些额外的信息，而不是编辑java的path变量，删除路径的那部分(只删除java!!)并创建一个指向tpo的新变量jdk/jre。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|125976|这似乎对我很有效。|125977|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Just some extra information for people that have still problems,
instead of editing the path variable of java, delete that part of the path(only the java!!)
and make a new variable pointing tpo the jdk/jre.
this seemed to work for me.

When trying to check the current version of Java in which I am running, I received the error &quot;java is not recognized as an internal or external command, operable program or batch file.&quot;.
I am running Windows 7 OS and have downloaded the latest JDK and felt I may have accidentally deleted the java from machine as before I was able to check the Java version using the command &quot;java -version&quot;.
What software must I download to get Java working on my machine again?
EDIT:
I have managed to get Java running from my cmd again after ensuring all environment variables pointed to the current Java SDK.

'Java' is not recognized as an internal or external command

当尝试检查我正在运行的Java的当前版本时，我收到错误消息"java不被识别为内部或外部命令、可操作程序或批处理文件。“我正在运行Windows7操作系统，并下载了最新的JDK，我觉得我可能不小心从机器上删除了java，就像以前使用命令"java -version“检查Java版本一样。我必须下载什么软件才能让Java在我的机器上再次工作？编辑：在确保所有环境变量都指向当前的Java SDK之后，

问“‘Java”未被识别为内部或外部命令
EN

回答 11

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问“‘Java”未被识别为内部或外部命令EN

回答 11

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问“‘Java”未被识别为内部或外部命令
EN