Install multiple versions of the JDK at the same time under Mac

After JDK8 GA, the small partners like to rush, have been eager to experience a Java8 lambda and other new features, but the current Java enterprise application of the main version is JDK6, JDK7. Therefore, I need to have jdk8,jdk7,jdk6 on my computer at the same time. JDK6 and JDK7 mainly do some product code verification, as well as play some of their own open-source projects, JDK8 is purely early adopters, who called us a hate programmer.
The target can be easily switched to the corresponding Java version by command ' Jdk6 ', ' jdk7 ', ' jdk8 ', and the default initial setting is Jdk7, at the command line.
Practices
1. Install all the JDK first:
* Mac comes with JDK6, installed in directory:/system/library/java/javavirtualmachines/1.6.0.jdk/. * Jdk7,jdk8 will need to download and install the corresponding version on the Oracle website. The default path for your own JDK installation is:/LIBRARY/JAVA/JAVAVIRTUALMACHINES/JDK1.8.0.JDK
2. Configure the path to Java_home in the bash configuration file in the user directory BASHRC:

Shell Code

1. Export java_6_home=/system/library/java/javavirtualmachines/1.6. 0.jdk/contents/home
2. Export JAVA_7_HOME=/LIBRARY/JAVA/JAVAVIRTUALMACHINES/JDK1. 7.0.jdk/contents/home
3. Export JAVA_8_HOME=/LIBRARY/JAVA/JAVAVIRTUALMACHINES/JDK1. 8.0.jdk/contents/home
4. 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 the alias command to dynamically switch Java_home configuration

Shell Code

1. Alias jdk8=' export java_home= $JAVA _8_home '
2. Alias jdk7=' export java_home= $JAVA _7_home '
3. 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 '

Authentication

Shell Code

2. Cnxnliu:versions xnliu$ java-version
4. Java version "1.6.0_65"
6. Java (TM) SE Runtime Environment (build 1.6.0_65-b14-462-11m4609)
8. Java HotSpot (TM) 64-bit Server VM (build 20.65-b04-462, Mixed mode)
10. Cnxnliu:versions xnliu$ Jdk8
12. Cnxnliu:versions xnliu$ java-version
14. Java version "1.8.0"
16. Java (TM) SE Runtime Environment (build 1.8. 0-b132)
18. Java HotSpot (TM) 64-bit Server VM (Build 25.0-b70, Mixed mode)
20. Cnxnliu:versions xnliu$

Install multiple versions of the JDK at the same time under Mac