Java多版本切换工具
Java多版本切换时，需要每次手动的修改系统环境，这很麻烦， Jenv是一款Java多版本切换工具
下载Releases的最新版本
Jenv使用方法
相关命令：
jenv -help
JEnv is changing your environment variables. This process could take longer but it happens only when a jenv executable is found in your path
"jenv list" List all registered Java-Envs.
"jenv add <name> <path>" Adds a new Java-Version to JEnv which can be refferenced by the given name
"jenv remove <name>" Removes the specified Java-Version from JEnv
"jenv change <name>" Applys the given Java-Version globaly for all restarted shells and this one
"jenv use <name>" Applys the given Java-Version locally for the current shell
"jenv local <name>" Will use the given Java-Version whenever in this folder. Will set the Java-version for all subfolders as well
"jenv link <executable>" Creates shortcuts for executables inside JAVA_HOME. For example "javac"
"jenv uninstall <name>" Deletes JEnv and restores the specified java version to the system. You may keep your config file
"jenv autoscan [--yes|-y] ?<path>?" Will scan the given path for java installations and ask to add them to JEnv. Path is optional and "--yes|-y" accepts defaults.
踩坑
- 使用
jenv更改 JDK 版本后，java版本会更改，但是不会改变javac版本，会出现Java版本为11，而javac版本仍为1.8，当手动javac对.java文件编译为.class文件后，使用java命令运行.class文件会报错。
这时手动修改
JAVA_HOME环境变量是没有用的，需要将PATH环境变量中javac文件路径提前到第一个。
