我已经安装了从oracle网站下载的JDK 7u7。但是安装完成后，终端仍然显示java版本6
$java -version
java version "1.6.0_35"
Java(TM) SE Runtime Environment (build 1.6.0_35-b10-428-11M3811)
Java HotSpot(TM) 64-Bit Server VM (build 20.10-b01-428, mixed mode)
你知道为什么Java 7没有出现吗?
答:
好的，问题已经解决了。以下是答案:
我发现我的终端有一个.bash_profile, java主变量被设置为1.6
export JAVA_HOME="/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home"
所以这就是每次我打开新终端窗口时导致问题的行。
只要去掉这条线就能解决问题。您仍然需要遵循@aleroot所说的，但如果这对您不起作用，请检查.bash_profile(或.bashrc)设置文件，以查看您之前是否导出过任何java版本。
自从El Capitan之后，由于引入了新的“无根”策略，很难删除/usr/bin/java符号链接。
因此，我简单地将最新java版本的路径(在我的情况下，这是/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin)添加到我的.bashrc文件的path中:
# Use latest java version
export PATH=/Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin:$PATH
要为当前会话重新加载.bashrc文件，请运行source ~/。Bashrc在壳里。您只需要对在更改.bashrc文件之前已经启动的会话执行此操作。
当你在shell中使用java时，现在使用的是最新版本。
基本问题:/usr/bin/java最初指向OSX自己提供的(/System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java)
我们需要将它指向JDK安装程序下载的那个。以下步骤适用于OSX 10.10.4 Yosemite。
Open System Preferences -> select Java. The Java window opens.
Click on Java tab at the top. Click on 'View' button.
The Java Runtime Environment Settings tab opens as below:
Double click on the Path item and copy the path (cmd+c). This is the latest one installed by the JDK installer/updater. In my case, the path was /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java
Open terminal. In this step, we are going to point (symbolic link, ln -s command) the system java binary to the latest one, which we discovered in the previous step. Run the below command:
sudo ln -s /Library/Internet\ Plug-Ins/JavaAppletPlugin。插件/内容/ Home / bin / java /usr/bin/java
这是它。要验证，只需运行
java - version
在终端上。它应该输出您安装/更新到的最新版本。
在我的案例中，问题是Oracle将它安装到与我习惯的位置不同的位置。
从Oracle下载:http://java.com/en/download/mac_download.jsp?locale=en
Verify that it's installed properly by looking in System Prefs:
Command-Space to open Spotlight, type 'System Preferences', hit enter.
Click Java icon in bottom row. After the Java Control Panel opens, click 'Java' tab, 'View...', and verify that your install worked. You can see a 'Path' there also, which you can sub into the commands below in case they are different than mine.
Verify that the version is as you expect (sub in your path as needed):
/Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java -version
Create link from /usr/bin/java to your new install
sudo ln -fs /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java /usr/bin/java
Sanity check your version:
java -version
