blocks|key|758785|text|update-java-alternatives+-l|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|758786|将告诉您哪个java实现是您系统的默认实现，以及它在文件系统中的安装位置。有关更多选项，请查看手册。|unstyled|758787|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>update-java-alternatives -l
</code></pre>

will tell you which java implementation is the default for your system and where in the filesystem it is installed. Check the manual for more options.

blocks|key|974232|text|$+which+java+|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|974233|应该会给你一些类似这样的东西|unstyled|974234|/usr/bin/java|974235|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>$ which java 
</code></pre>

should give you something like

<pre><code>/usr/bin/java
</code></pre>

blocks|key|758716|text|此问题将被移动，但您可以执行以下操作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|758717|which+javac|code-block|syntax|javascript|758718|或|758719|cd+/
find+.+-name+'javac'|758720|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

This question will get moved but you can do the following

<pre><code>which javac
</code></pre>

or

<pre><code>cd /
find . -name 'javac'
</code></pre>

blocks|key|974203|text|使用find来定位它。它应该在/usr下的某个位置：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|974204|find+/usr+-name+java|code-block|syntax|javascript|974205|在运行该命令时，如果有太多“权限被拒绝”消息混淆了实际找到的结果，那么只需将stderr重定向到/dev/null即可|974206|find+/usr+-name+java+2>+/dev/null|974207|entityMap^0|F|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

Use find to located it. It should be under <code>/usr</code> somewhere:

<pre><code>find /usr -name java
</code></pre>

When running the command, if there are too many "Permission denied" message obfuscating the actual found results then, simply redirect stderr to /dev/null

<pre><code>find /usr -name java 2&gt; /dev/null
</code></pre>

blocks|key|974519|text|另一种找到Java文件夹路径的最好方法是在Fedora+Linux中使用alternatives命令(我知道它是针对Ubuntu的，但我是通过谷歌的标题找到这篇文章的)。只是想分享一下，以防像我这样的人在寻找软呢味的答案。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|974520|显示有关java的所有信息|974521|alternatives+--display+java|code-block|syntax|javascript|974522|entityMap^0|10|C|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Another best way to find Java folder path is to use <code>alternatives</code> command in Fedora Linux (I know its for Ubuntu but I hit this post from google just by its headline). Just want to share incase people like me looking for answers for fedora flavour.

To display all information regarding java

<pre><code>alternatives --display java
</code></pre>

blocks|key|974638|text|三步过程:第一步:打开终端->$+whereis+java它会给出如下输出：java:+/usr/bin/java+/usr/share/java+/usr/share/man/man1/java.1.gz|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|974639|第二个：ls+-l+/usr/bin/java它会给出这样的输出：lrwxrwxrwx+1+root+root+22+Feb++9+10:59+/usr/bin/java+->+/etc/alternatives/java|974640|第三：ls+-l+/etc/alternatives/java输出是JDK路径：lrwxrwxrwx+1+root+root+46+Feb++9+10:59+/etc/alternatives/java+->+/usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java|974641|entityMap^0|F|E|12|1T|0|4|J|X|26|0|3|S|14|33|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|K|$]]

Three Step Process:
First:
open Terminal-><code>$ whereis java</code>
it would give output like this:
<code>java: /usr/bin/java /usr/share/java /usr/share/man/man1/java.1.gz</code>

Second:
<code>ls -l /usr/bin/java</code>
It would give output like this:
<code>lrwxrwxrwx 1 root root 22 Feb 9 10:59 /usr/bin/java -&gt; /etc/alternatives/java</code>

Third:
<code>ls -l /etc/alternatives/java</code>
output is the JDK path:
<code>lrwxrwxrwx 1 root root 46 Feb 9 10:59 /etc/alternatives/java -&gt; /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java</code>

blocks|key|974591|text|命令：sudo+update-alternatives+--config+java将找到所有已安装Java版本的完整路径|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|974592|entityMap^0|3|12|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

the command: <code>sudo update-alternatives --config java</code> will find the complete path of all installed Java versions

blocks|key|974714|text|这个问题似乎仍然相关，答案似乎是一个移动的目标。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|974715|在我的debian系统上(buster)：|974716|>+update-java-alternatives+-l
java-1.11.0-openjdk-amd64++++++1111+++++++/usr/lib/jvm/java-1.11.0-openjdk-amd64|code-block|syntax|javascript|974717|但是，如果您实际查看那里，您会看到包系统放置了多个目录和符号链接，以简化将来的维护。|974718|实际的目录是带有另一个符号链接default-java的java-11-openjdk-amd64。还有一个openjdk-11目录，但它似乎只包含一个source.zip文件。|offset|length|style|CODE|974719|鉴于此，仅对Debian而言，我猜测最好的值是/usr/lib/jvm/default-java，因为它应该总是有效的，即使您决定安装完全不同的java版本，甚至切换供应商。|974720|想要知道路径的正常原因是因为某些应用程序需要它，而您可能不希望该应用程序因为您进行了更改版本号的升级而中断。|974721|entityMap^0|0|0|0|0|F|C|S|L|1I|A|0|N|P|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|10|8|@$M|11|N|12|O|P]|$M|13|N|14|O|P]|$M|15|N|16|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|17|8|@$M|18|N|19|O|P]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1A|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|V|$]]

This question still seems relevant, and the answer seems to be a moving target.

On my debian system (buster):

<pre><code>&gt; update-java-alternatives -l
java-1.11.0-openjdk-amd64 1111 /usr/lib/jvm/java-1.11.0-openjdk-amd64
</code></pre>

However, if you actually go look there, you'll see there are multiple directories and symbolic links placed there by the package system to simplify future maintenance.

The actual directory is <code>java-11-openjdk-amd64</code>, with another symlink of <code>default-java</code>. There is also an <code>openjdk-11</code> directory, but it appears to only contain a source.zip file.

Given this, for Debian ONLY, I would guess the best value to use is <code>/usr/lib/jvm/default-java</code>, as this should always be valid, even if you decide to install a totally different version of java, or even switch vendors.

The normal reason to want to know the path is because some application wants it, and you probably don't want that app to break because you did an upgrade that changed version numbers.

blocks|key|758840|text|在OpenSUSE+13.1/13.2+its上：/usr/lib64/jvm/java-1.6.0-openjdk-(version-number)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|758841|version-number可以是1.7.x+1.8.x等，请检查您已安装的软件管理器的版本...|758842|安德烈|758843|entityMap^0|P|1E|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|P|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|K|$]]

on OpenSUSE 13.1/13.2 its: <code>/usr/lib64/jvm/java-1.6.0-openjdk-(version-number)</code> 
version-number can be 1.7.x 1.8.x etc. check software manager witch version you have installed... 

André

blocks|key|974778|text|在Linux+Fedora30上有几个完整的java+JDK版本，特别是包名：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|974779|java-1.8.0-openjdk-devel.x86_64+
java-11-openjdk-devel.x86_64|code-block|syntax|javascript|974780|安装后，可在以下位置找到它们：/usr/lib/jvm|offset|length|style|CODE|974781|要选择完整开发JDK的位置/目录(这与更简单的运行时只有JRE不同)，请查找以下条目：|974782|ls+-ld+java*openjdk*|974783|这里有两个很好的选择，它们是指向特定版本的链接，您必须在其中选择版本：|974784|/usr/lib/jvm/java-1.8.0-openjdk
/usr/lib/jvm/java-11-openjdk|974785|entityMap^0|0|0|F|C|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

On Linux Fedora30 several versions of the full java JDK are available, specifically package names:

<pre><code>java-1.8.0-openjdk-devel.x86_64 
java-11-openjdk-devel.x86_64
</code></pre>

Once installed, they are found in: <code>/usr/lib/jvm</code>

To select the location/directory of a full development JDK (which is different from the simpler runtime only JRE) look for entries:

<pre><code>ls -ld java*openjdk*
</code></pre>

Here are two good choices, which are links to specific versions, where you will have to select the version:

<pre><code>/usr/lib/jvm/java-1.8.0-openjdk
/usr/lib/jvm/java-11-openjdk
</code></pre>

blocks|key|974845|text|这是我执行此命令的最好方法：-|type|unstyled|depth|inlineStyleRanges|entityRanges|data|974846|$(dirname+$(readlink+$(which+javac)))/java_home|code-block|syntax|javascript|974847|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is the best way which worked for me 
Execute this Command:-

<pre><code>$(dirname $(readlink $(which javac)))/java_home
</code></pre>

blocks|key|974902|text|下面的命令在我的debain+10邮箱中起作用了！|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|974903|root@debian:/home/arun#+readlink+-f+$(which+java)
/usr/lib/jvm/java-11-openjdk-amd64/bin/java|code-block|syntax|javascript|974904|entityMap^0|8|9|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

below command worked in my <code>debain 10</code> box!
<pre><code>root@debian:/home/arun# readlink -f $(which java)
/usr/lib/jvm/java-11-openjdk-amd64/bin/java
</code></pre>

I installed JDK using apt-get install but I don't know where my jdk folder is. I need to set the path for that. Does any one have a clue on the location?

Where can I find the Java SDK in Linux after installing it?

我使用apt-get install安装了JDK，但我不知道jdk文件夹在哪里。我需要为它设置路径。有谁知道地点的线索吗？

问在Linux中安装Java SDK后，在哪里可以找到它？
EN

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问在Linux中安装Java SDK后，在哪里可以找到它？
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