mac jdk 6设置

新装的mac 系统10.10 ,jdk是1.8,因为一些工具要使用 jdk 6,以下是设置过程

查看版本

java -version

查看java是再哪:在/usr/bin/java

whereis java
cd /usr/bin
ls -all | grep java
lrwxr-xr-x 1 root wheel 74 9 23 00:23 java -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java
lrwxr-xr-x 1 root wheel 75 9 23 00:23 javac -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/javac
lrwxr-xr-x 1 root wheel 77 9 23 00:23 javadoc -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/javadoc
lrwxr-xr-x 1 root wheel 75 9 23 00:23 javah -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/javah
lrwxr-xr-x 1 root wheel 75 9 23 00:23 javap -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/javap
lrwxr-xr-x 1 root wheel 76 9 23 00:23 javaws -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/javaws

都是软链接

cd /System/Library/Frameworks/JavaVM.framework/Versions/
ls -all
drwxr-xr-x 11 root wheel 374 9 23 00:23 .
drwxr-xr-x 11 root wheel 374 9 23 00:23 ..
lrwxr-xr-x 1 root wheel 10 9 23 00:23 1.4 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 9 23 00:23 1.4.2 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 9 23 00:23 1.5 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 9 23 00:23 1.5.0 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 9 23 00:23 1.6 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 9 23 00:23 1.6.0 -> CurrentJDK
drwxr-xr-x 7 root wheel 238 9 23 00:23 A
lrwxr-xr-x 1 root wheel 1 9 23 00:23 Current -> A
lrwxr-xr-x 1 root wheel 59 9 23 00:23 CurrentJDK -> /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents

Current 指向了A,A是1.8的

我自己安装的1.6 在CurrentJDK,删除以前的软链接,执java的数据类型行CurrentJDK,就Ok了,如果要还原到1.8 就重新建立软链接

sudo rm -rf Current

ln -s CurrentJDK Current

ls -all
total 64
drwxr-xr-x 11 root wheel 374 9 23 00:32 .
drwxr-xr-x 11 root wheel 374 9 23 00:23 ..
lrwxr-xr-x 1 root wheel 10 9 23 00:23 1.4 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 9 23 00:23 1.4.2 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 9 23 00:23 1.5 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 9 23 00:23 1.5.0 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 9 23 00:23 1.6 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 9 23 00:23 1.6.0 -> CurrentJDK
drwxr-xr-x 7 root wheel 238 9 23 00:23 A
lrwxr-xr-x 1 root wheel 10 9 23 00:32 Current -> CurrentJDK
lrwxr-xr-x 1 root wheel 59 9 23 00:23 CurrentJDK -> /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents

java -version
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-466.1-11M4716)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-466.1, mixed mode)

 Mac JDK 1.6 安装 :是否有毒,自行判断,因为xcodeGoast,心里有点怕怕的。