MAC 多版本JDK并存解决方案

1.sudo vi .bash_profile

2.填入如下内容

# JDK 6                                                                                              

export JAVA_6_HOME=`/usr/libexec/java_home -v 1.6`                                                   
# JDK 7                                                                                              
export JAVA_7_HOME=`/usr/libexec/java_home -v 1.7`                                                   
# JDK 8                                                                                              
export JAVA_8_HOME=`/usr/libexec/java_home -v 1.8`                                                   
                                                                                                     
#defalult JDK 8                                                                                      
export JAVA_HOME=$JAVA_8_HOME                                                                        
                                                                                                     
# use alias set JDK version                                                                          
alias jdk6="export JAVA_HOME=$JAVA_6_HOME"                                                           

alias jdk7="export JAVA_HOME=$JAVA_7_HOME"

alias jdk8="export JAVA_HOME=$JAVA_8_HOME" 

3.source .bash_profile