MacOS multi-version JDK switching

1. First install all JDk:
* JDK7, JDK8, you need to download and install the corresponding version from Oracle official website.

The default path of the JDK installed by yourself is: /Library/Java/JavaVirtualMachines/jdk1.xxjdk

2. Configure
to create a .bash_profile configuration file (skip this step if you already have this file)

1	touch  ~/.bash_profile

#vimEdit .bash_profile file

1	vim ~/.bash_profile

#If you are not used to the vim command, use the built-in text editor to open it

1	open  ~/.bash_profile

set jdk version

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export  JAVA_7_HOME= /Library/Java/JavaVirtualMachines/jdk1 .7.0.jdk /Contents/Home export  JAVA_8_HOME= /Library/Java/JavaVirtualMachines/jdk1 .8.0.jdk /Contents/Home   export  JAVA_HOME=$JAVA_7_HOME

The alias command dynamically switches the configuration of JAVA_HOME

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alias  jdk7= 'export JAVA_HOME=$JAVA_7_HOME' alias  jdk8=' export  JAVA_HOME=$JAVA_8_HOME’

#Save and execute the following command after the input is completed
#Re-execute the .bash_profile file

1	source  ~/.bash_profile

3. Verify:
Use: jdk7, jdk8 to switch jdk version