尝试在Mac上卸载java失败

我愿意在我的机器上运行Spark shell，它与我的版本（java 11）不兼容，因此需要删除并安装兼容的版本（jdk8）。按指定运行以下命令：

命令运行，但仍存在java 11：

$ java -version
java version "11" 2018-09-25
Java(TM) SE Runtime Environment 18.9 (build 11+28)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11+28, mixed mode)

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不确定是什么原因造成的。

这不会删除JRE或JDK。如果需要查找所有Java安装，只需启动以下命令：

$ /usr/libexec/java_home -V
Matching Java Virtual Machines (6):
    11.0.1, x86_64: "Java SE 11.0.1"    /Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home
    10.0.1, x86_64: "Java SE 10.0.1"    /Library/Java/JavaVirtualMachines/jdk-10.0.1.jdk/Contents/Home
    1.8.0_40, x86_64:   "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_40.jdk/Contents/Home
    1.7.0_11, x86_64:   "Java SE 7" /Library/Java/JavaVirtualMachines/jdk1.7.0_11.jdk/Contents/Home
    1.6.0_37-b06-434, x86_64:   "Java SE 6" /Library/Java/JavaVirtualMachines/1.6.0_37-b06-434.jdk/Contents/Home
    1.6.0_37-b06-434, i386: "Java SE 6" /Library/Java/JavaVirtualMachines/1.6.0_37-b06-434.jdk/Contents/Home

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确保路径上配置的JDK已更新，并且确实不需要删除11

$ /usr/libexec/java_home -V
Matching Java Virtual Machines (6):
    11.0.1, x86_64: "Java SE 11.0.1"    /Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home
    10.0.1, x86_64: "Java SE 10.0.1"    /Library/Java/JavaVirtualMachines/jdk-10.0.1.jdk/Contents/Home
    1.8.0_40, x86_64:   "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_40.jdk/Contents/Home
    1.7.0_11, x86_64:   "Java SE 7" /Library/Java/JavaVirtualMachines/jdk1.7.0_11.jdk/Contents/Home
    1.6.0_37-b06-434, x86_64:   "Java SE 6" /Library/Java/JavaVirtualMachines/1.6.0_37-b06-434.jdk/Contents/Home
    1.6.0_37-b06-434, i386: "Java SE 6" /Library/Java/JavaVirtualMachines/1.6.0_37-b06-434.jdk/Contents/Home