1. /usr/libexec/java_home -V
    1. Matching Java Virtual Machines (2):
    2.     1.8.321.07 (x86_64) "Oracle Corporation" - "Java" /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
    3.     1.8.0_321 (x86_64) "Oracle Corporation" - "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_321.jdk/Contents/Home
    4. /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
    1. /Library/Java/JavaVirtualMachines/jdk1.8.0_321.jdk/Contents/Home
    1. JAVA_HOME=JDK的绝对路径
    3. PATH=$JAVA_HOME/bin:$PATH:.
    5. CLASSPATH=$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar:.
    7. export JAVA_HOME
    9. export PATH
    11. export CLASSPATH
    1. echo $JAVA_HOME

    :::info 经过测试得出，修改环境变量对应的JDK版本，可以达到修改默认JDK版本的效果。 :::