foreword
Since the latest jdk version was 17 before September this year, I downloaded and installed it, but when I started my local tomcat, I found that jdk17 was used, but the project was jdk8, so I need to switch to jdk8, then there is That's why this article was born.
1. View the default installation path of my JDK
2. Modify the configuration file
vim ~/.bash_profile
I added the following configuration at the top of the file
#JAVA
export JAVA_17_HOME=/Library/Java/JavaVirtualMachines/jdk-17.0.4.jdk/Contents/Home
export JAVA_8_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_333.jdk/Contents/Home
#默认JDK1.8
export JAVA_HOME=$JAVA_8_HOME
#alias命令动态切换JDK版本
alias jdk8="export JAVA_HOME=$JAVA_8_HOME"
alias jdk17="export JAVA_HOME=$JAVA_17_HOME"
In the English input method, press the ESC key, and enter :wq!the modification of the saved file, and then use the following command to make the operation take effect
source ~/.bash_profile
3. View and switch jdk version
Use java -versionto view the current version
java version "1.8.0_333"
Java(TM) SE Runtime Environment (build 1.8.0_333-b02)
Java HotSpot(TM) 64-Bit Server VM (build 25.333-b02, mixed mode)
Switch to jdk17, console input jdk17, use java -versionto view the current version
java version "17.0.4" 2022-07-19 LTS
Java(TM) SE Runtime Environment (build 17.0.4+11-LTS-179)
Java HotSpot(TM) 64-Bit Server VM (build 17.0.4+11-LTS-179, mixed mode, sharing)
Or switch to jdk8, use jdk8the command, and then execute it source ~/.bash_profileto switch to jdk8!
---------------------The more you know, the more you don't know----------------