【JAVA】mac配置java环境变量

如果用bash，修改~/.bash_profile 或 ~/.profile；

如果用zsh，修改～/.zshrc

修改这些文件之后，重修打开terminal，配置不会丢 

首先确保已经安装了jdk：

## check the present running java
which java

## check java version
java -version

以zsh为例：

## check all the available jdk
 2 /usr/libexec/java_home -V
 3 
 4 ## check the top jdk
 5 /usr/libexec/java_home
 6 
 7 ## check some jdk (eg. version 1.7)
 8 /usr/libexec/java_home -v 1.7
 9 
10 ## edit .zshrc to set java_home variable
11 vim ~/.zshrc
12 
13 ## add the following line into the file
14 export JAVA_HOME=$(/usr/libexec/java_home)
15 
16 ## you can also use the following line to set the variable, which is not recommended, only for older mac os.
17 ## export JAVA_HOME=/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
18 
19 ##let the configuration in .zshrc take effect
20 source ~/.zshrc
21 
22 ## check if configure succeed
23 echo $JAVA_HOME