Mac切换JDK

运行/usr/libexec/java_home -V查看已有JDK版本

Matching Java Virtual Machines (2):
    9.0.1, x86_64:      "Java SE 9.0.1" /Library/Java/JavaVirtualMachines/jdk-9.0.1.jdk/Contents/Home
    1.8.0_171, x86_64:  "Java SE 8"     /Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home

/Library/Java/JavaVirtualMachines/jdk-9.0.1.jdk/Contents/Home

选择一个版本设置到zshrc：

export JAVA_HOME=`/usr/libexec/java_home -v 1.8.0_171`