Install Multiple JDK versions at the same time on Mac, and multiple jdk versions on mac

Install Multiple JDK versions at the same time on Mac, and multiple jdk versions on mac

After JDK 8 GA, We were eager to try out new features such as Java 8 Lambda. However, the main version of Java enterprise-level applications is JDK 6 and JDK 7. Therefore, I need to have JDK8, JDK7, and jdk6. JDK 6 and JDK 7 are mainly used for product code verification and their own open-source projects. JDK 8 is an early adopter. Who is the old programmer.
TargetIn the command line, you can easily switch to the corresponding Java version by running the command 'jdk6', 'jdk7', and 'jdk8'. The default value is jdk7.
Practice
1. First install all JDk:
* The built-in JDK 6 for Mac is installed in the/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/directory. * For JDK 7 and JDK 8, you need to download and install the corresponding version on the Oracle official website. The default JDK installation path is/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk.
2. Configure the JAVA_HOME path in the bash configuration file. bashrc in the user directory:

Shell code

Export JAVA_6_HOME =/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

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

export JAVA_6_HOME=/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Homeexport JAVA_7_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0.jdk/Contents/Homeexport JAVA_8_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Homeexport JAVA_HOME=$JAVA_7_HOME

3. Create an alias command to dynamically switch the configuration of JAVA_HOME

Shell code

Alias jdk8 = 'export JAVA_HOME = $ JAVA_8_HOME'

Alias jdk7 = 'export JAVA_HOME = $ JAVA_7_HOME'

Alias jdk6 = 'export JAVA_HOME = $ JAVA_6_HOME'

alias jdk8='export JAVA_HOME=$JAVA_8_HOME'alias jdk7='export JAVA_HOME=$JAVA_7_HOME'alias jdk6='export JAVA_HOME=$JAVA_6_HOME'

* Verify *

Shell code

CNxnliu: Versions xnliu $ java-version

Java version "1.6.0 _ 65"

Java (TM) SE Runtime Environment (build 1.6.0 _ 65-b14-462-11M4609)

Java HotSpot (TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode)

CNxnliu: Versions xnliu $ jdk8

CNxnliu: Versions xnliu $ java-version

Java version "1.8.0"

Java (TM) SE Runtime Environment (build 1.8.0-b132)

Java HotSpot (TM) 64-Bit Server VM (build 25.0-b70, mixed mode)

CNxnliu: Versions xnliu $