blocks|key|669985|text|最有可能的是，您只安装了一个jdk，因此所有软链接都指向同一jdk。但是，如果您确实安装了多个jdks，则需要选择要与/Application/Utilities中的“Java+Preferences”应用程序一起使用的jdks。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|669986|顺便说一句，软链接是从终端使用ln+-s命令创建的。|offset|length|style|CODE|669987|entityMap^0|0|F|5|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Most possibly you only have one jdk installed, thus all the soft links points to the same jdk. If you however did have multiple jdks installed you would need to choose which one to use with the 'Java Preferences' app in your /Application/Utilities.

Soft links are by the way created with the <code>ln -s</code> command from Terminal.

blocks|key|887184|text|对于不同类型的JDK或安装，您将有不同的路径。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|887185|在Mac+OS+X+Mavericks上，我找到的路径如下：|887186|1)内置JRE默认值：|887187|+/Library/Internet\+Plug-Ins/JavaAppletPlugin.plugin/Contents/Home|code-block|syntax|javascript|887188|2)从苹果下载JDK：|887189|+/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/|887190|3)从Oracle下载JDK：|887191|/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home|887192|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|H|7|Z|8|@]|9|@]|A|$I|J]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|H|7|11|8|@]|9|@]|A|$I|J]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

For different types of JDKs or installations, you will have different paths.

On Mac OS X Mavericks, the path I found as following:

1) Built-in JRE default:

<pre><code> /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
</code></pre>

2) JDKs downloaded from Apple:

<pre><code> /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/
</code></pre>

3) JDKs downloaded from Oracle:

<pre><code>/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home
</code></pre>

blocks|key|670094|text|只需运行以下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|670095|$+brew+update
$+brew+install+jenv
$+echo+'export+PATH="$HOME/.jenv/bin:$PATH"'+>>+~/.bash_profile
$+echo+'eval+"$(jenv+init+-)"'+>>+~/.bash_profile
$+source+~/.bash_profile

$+jenv+add+/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/
++oracle64-1.8.0.45+added
++1.8.0.45+added
++1.8+added

$+jenv+add+/Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home
++oracle64-1.7.0.79+added
++1.7.0.79+added
++1.7+added

$+jenv+versions
*+system+(set+by+/Users/wanluwang/.jenv/version)
++1.7
++1.7.0.79
++1.8
++1.8.0.45
++oracle64-1.7.0.79
++oracle64-1.8.0.45

$+java+-version
++java+version+"1.8.0_45"
++Java(TM)+SE+Runtime+Environment+(build+1.8.0_45-b14)
++Java+HotSpot(TM)+64-Bit+Server+VM+(build+25.45-b02,+mixed+mode)

$+jenv+global+oracle64-1.7.0.79

$+java+-version
++java+version+"1.7.0_79"
++Java(TM)+SE+Runtime+Environment+(build+1.7.0_79-b15)
++Java+HotSpot(TM)+64-Bit+Server+VM+(build+24.79-b02,+mixed+mode)|code-block|syntax|javascript|670096|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|$]]

Just run following commands:

<pre><code>$ brew update
$ brew install jenv
$ echo 'export PATH="$HOME/.jenv/bin:$PATH"' &gt;&gt; ~/.bash_profile
$ echo 'eval "$(jenv init -)"' &gt;&gt; ~/.bash_profile
$ source ~/.bash_profile

$ jenv add /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/
 oracle64-1.8.0.45 added
 1.8.0.45 added
 1.8 added

$ jenv add /Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home
 oracle64-1.7.0.79 added
 1.7.0.79 added
 1.7 added

$ jenv versions
* system (set by /Users/wanluwang/.jenv/version)
 1.7
 1.7.0.79
 1.8
 1.8.0.45
 oracle64-1.7.0.79
 oracle64-1.8.0.45

$ java -version
 java version "1.8.0_45"
 Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
 Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

$ jenv global oracle64-1.7.0.79

$ java -version
 java version "1.7.0_79"
 Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
 Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)
</code></pre>

blocks|key|670139|text|来自Apple+Technical+Q&A的Java问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|670140|用户首选项|670141|在Mac上，Java运行时提供了Mac首选项API和目录支持的java.util.prefs+API。只需使用这个纯Java+API，就可以读取和存储Mac+OS+X属性列表文件中~/Library/Preferences中的应用程序首选项。对于可能已经具有自己的首选项格式的应用程序，这些首选项也应该存储在~/Library/Preferences目录中。通过创建路径为System.getProperty("user.home")+%2B+"/Library/Preferences/“%2B+"com.example.your.Application”的文件，可以从Java代码访问该目录。应该对所有用户具有全局首选项的应用程序可以驻留在/Library/Preferences中，但是非管理员用户不能写入该目录。|670142|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

From Apple Technical Q&amp;A Java Questions:

User Preferences

On Mac OS X, the Java runtime provides the java.util.prefs API which is backed by the standard Mac OS X Preferences API and directories. Simply using this pure Java API reads and stores your application's preferences in ~/Library/Preferences in a Mac OS X property list file. For applications that may already have their own preferences format, these preferences should be stored in the ~/Library/Preferences directory as well. This directory can be reached from Java code by creating a file with the path of System.getProperty("user.home") + "/Library/Preferences/" + "com.example.your.Application". An application that should have global preferences across all users could instead reside in /Library/Preferences, however this directory is not writable by non-admin users.

blocks|key|670213|text|在.bash_profile中设置$JAVA_HOME=$(/usr/libexec/java_home|type|unstyled|depth|inlineStyleRanges|entityRanges|data|670214|或者导出JAVA_HOME=$(/usr/libexec/java_home)；|670215|echo+$JAVA_HOME|670216|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

set $JAVA_HOME=$(/usr/libexec/java_home)
in your .bash_profile

or export JAVA_HOME=$(/usr/libexec/java_home);

echo $JAVA_HOME

I have trouble understanding (actual paths vs links) for multiple java versions on my Mac OSX. Normally in windows if I have multiple versions installed in my machine, I can just take the path of which ever version I want and use it. But in MAC OS X I undertand that there is something called links that is being pointed to CurrentJDK, and if I want to use a different version I will need to change the link to CurrentJdk right? But what is confusing for me is that as you can see below all my versions are pointing to the same CurrentJDK which means all versions point to current version? I was expecting only one of them would be pointing to CurrentJDK and I could just change it to which ever one I need which is not the case here. All I need to know is how to find the bin(Commands) folder path for each version, so that I can just use it to point to CurrentJDK? Also tell me how to change the link to CurrentJDK.

<pre><code>$ java -version

java version "1.6.0_24"
Java(TM) SE Runtime Environment (build 1.6.0_24-b07-334-10M3326)
Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02-334, mixed mode)

$ pwd

/System/Library/Frameworks/JavaVM.framework/Versions


$ ls -l

lrwxr-xr-x 1 root wheel 5 Mar 20 11:12 1.3 -&gt; 1.3.1
drwxr-xr-x 3 root wheel 102 Dec 2 2009 1.3.1
lrwxr-xr-x 1 root wheel 10 Mar 20 11:12 1.4 -&gt; CurrentJDK
lrwxr-xr-x 1 root wheel 10 Mar 20 11:12 1.4.2 -&gt; CurrentJDK
lrwxr-xr-x 1 root wheel 10 Mar 20 11:12 1.5 -&gt; CurrentJDK
lrwxr-xr-x 1 root wheel 10 Mar 20 11:12 1.5.0 -&gt; CurrentJDK
lrwxr-xr-x 1 root wheel 10 Mar 20 11:12 1.6 -&gt; CurrentJDK
lrwxr-xr-x 1 root wheel 10 Mar 20 11:12 1.6.0 -&gt; CurrentJDK
drwxr-xr-x 10 root wheel 340 Mar 20 11:13 A
lrwxr-xr-x 1 root wheel 1 Mar 20 11:12 Current -&gt; A
lrwxr-xr-x 1 root wheel 59 Mar 20 11:12 CurrentJDK -&gt; /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents
</code></pre>

Mac OS X 10.6.7 Java Path Current JDK confusing

Java

在我的Mac OSX上，我很难理解多个java版本的(实际路径和链接)。通常在windows中，如果我的机器上安装了多个版本，我可以选择我想要的任何版本的路径并使用它。但是在MAC中，我理解到有一个叫做链接的东西是指向CurrentJdk的，如果我想使用一个不同的版本，我需要把链接改为CurrentJDK，对吧？但令我...

问Mac OS X 10.6.7 Java Path当前JDK令人困惑
EN

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Mac OS X 10.6.7 Java Path当前JDK令人困惑EN

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Mac OS X 10.6.7 Java Path当前JDK令人困惑
EN