卸載步驟
輸入
sudo rm -fr /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin
sudo rm -fr /Library/PreferencesPanes/JavaControlPanel.prefpane
查找當前版本
輸入：ls /Library/Java/JavaVirtualMachines/
輸出：jdk-9.0.1.jdk
sudo rm -rf /Library/Java/JavaVirtualMachines/jdk-9.0.1.jdk