A mounting step
1. official website to download jdk
https://www.oracle.com/technetwork/java/javase/downloads/index.html
Check Accept License Agreement, clickjdk-8u221-macosx-x64.dmg Download
2. Install
Double-click the downloaded jdk
Pop-up window, and then double-click jdk
Pop-up window, click Continue
The installation is complete, click Close
3. Verify
command + space, input ter, carriage return
Enter java -version
Jdk version information that is displayed successful installation
Second, the uninstall procedure
输入
sudo rm -fr /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin
Enter the password
sudo rm -fr /Library/PreferencesPanes/JavaControlPanel.prefpane
Find the current version
enter: ls / Library / Java / JavaVirtualMachines /
Output: jdk1.8.0_221.jdk
sudo rm -rf /Library/Java/JavaVirtualMachines/jdk1.8.0_221.jdk