1. Delete in Control Panel. (But after I uninstalled it like this, Java didn't uninstall completely).
2. Find the installation directory of Java and delete the Java folder directly.
3. Delete the registry. Type Regedit in Run, open the registry editor, find HKEY_LOCAL_MACHINE/SOFTWARE/JavaSoft, and delete all the JavaSoft folders and their subdirectories.
4. Delete the environment variable, how if you want to reinstall it, you only need to modify the environment variable.
In addition, Sun also provides an uninstallation tool. The website ishttps://java.com/en/download/uninstalltool.jspBut I haven't tried this software, you can try it.
JavaUninstallTool download:
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