更改 java 版本 (Mac)
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Change java version (Mac)
提问by Grains
I have 2 java versions on my computer:
我的电脑上有 2 个 Java 版本：
/Library/Java/JavaVirtualMachines/jdk1.7.0_07.jdk/Contents/Home
/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
The 1.6.0 is set to default. How can I make my java programs to run 1.7?
1.6.0 设置为默认值。如何让我的 Java 程序运行 1.7？
Tried to add:
尝试添加：
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_07.jdk/Contents/Home
to my .zshrcfile. But this seems to only change the path for my terminals javacommand.
到我的.zshrc文件。但这似乎只会改变我的终端java命令的路径。
Also tried to change the HOME symlink like this:
还尝试像这样更改 HOME 符号链接：
cd /Library/Java
mv Home Home-1.6
ln -s /Library/Java/JavaVirtualMachines/jdk1.7.0_07.jdk/Contents/Home/ Home
This had no effect at all.
这根本没有效果。
Also tried java changer software: http://www.guigarage.com/2013/02/change-java-version-on-mac-os/But no effect.
也试过 java 转换器软件：http: //www.guigarage.com/2013/02/change-java-version-on-mac-os/但没有效果。
Any idea how to start java programs like .app and .jar files with the 1.7 version by just clicking on them?
知道如何通过单击 1.7 版本来启动 .app 和 .jar 文件等 Java 程序吗？
采纳答案by Nicolas Rinaudo
I believe OS X (at least 10.8) uses the following paths:
我相信 OS X（至少 10.8）使用以下路径：
- JRE:
/System/Library/Frameworks/JavaVM.framework/Versions/Current - JDK:
/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK
- JRE：
/System/Library/Frameworks/JavaVM.framework/Versions/Current - JDK：
/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK
Those are symlinks, which you can update to point to your 1.7 installation.
这些是符号链接，您可以更新它们以指向您的 1.7 安装。
You can verify this fairly easily:
您可以很容易地验证这一点：
a) run which javato check which java executable is being executed. In theory, that should be /usr/bin/java.
a) 运行which java以检查正在执行哪个 java 可执行文件。理论上应该是这样/usr/bin/java。
b) run ls -laon your java executable, which should tell you where it points (/System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java
on my machine).
b)ls -la在你的 java 可执行文件上运行，它应该告诉你它指向哪里（/System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java
在我的机器上）。
I think this should sort your .jarexecution issue. If your Java application is wrapped in a .app, I believe it's a bit more complex: if memory serves, the version of java used will depend on the JavaApplicationStubbeing used by the .app.
我认为这应该对您的.jar执行问题进行排序。如果您的Java应用程序被包裹在一个.app，我相信这是一个比较复杂：如果没有记错，JAVA的使用将取决于版本JavaApplicationStub正在使用的.app。
回答by saganas
You can always add into your profileboth on Mac or Linux. Just create if doesn't exist ~/.profile file and there this line:
您始终可以在 Mac 或 Linux 上添加到您的个人资料中。如果不存在，则创建 ~/.profile 文件，然后创建这一行：
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_07.jdk/Contents/Home
This should work .zshrc as well as .bash_profile are loaded only when terminal window is openned and profile when your graphical environment starts up.
回答by user3566154
$ edit ~/.profile
#Java 1.8
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_20.jdk/Contents/Home
export PATH=${PATH}:${JAVA_HOME}
$ java -version
java version "1.8.0_20-ea"
here are the steps:
以下是步骤：
http://ukitech.blogspot.com/2014/04/switching-version-of-java-on-mac.html
http://ukitech.blogspot.com/2014/04/switching-version-of-java-on-mac.html
