A clear and easy-to-understand Java 8 thorough uninstallation and cleaning tutorial

1. Uninstall Java 8 on Windows system

Step 1: Uninstall the program through the control panel

PressWin + R, enter, Enter to open "Programs and Functions".
Find all names in the list containingJava 8、JDK 8orJRE 8entries.
Right-click to select one by one and clickuninstall, follow the prompts to complete the uninstallation.

Step 2: Manually delete residual files

Open File Explorer and delete the following directories (if they exist):
```
C:\Program Files\Java
C:\Program Files (x86)\Java
C:\ProgramData\Oracle\Java
C:\Users\&lt;Your username&gt;\AppData\Local\Java
```
hint:ProgramDataandAppDataIt is a hidden folder, and you need to check "Hide items" in the "View" menu.

Step 3: Clean up environment variables

Right-click "This Computer" → Properties → Advanced System Settings → Environment Variables.
Check the following two items and delete Java-related entries:
- System variables:deleteJAVA_HOME。
- Path variable:delete%JAVA_HOME%\binor similar path.

Step 4: Clean the registry (operate with caution)

PressWin + R, enterregedit, Enter to open the registry editor.
Backup the registry(File → Export).

Delete the following registry key (if it exists):

HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft
HKEY_CURRENT_USER\Software\JavaSoft

2. Uninstall Java 8 on macOS system

Method 1: Uninstall via terminal

Open the Terminal and enter the following command to delete the Java file:

sudo rm -rf /Library/Java/JavaVirtualMachines/jdk-8*.jdk
sudo rm -rf /Library/PreferencePanes/
sudo rm -rf /Library/Internet\ Plug-Ins/

Method 2: Check the Java installed by Homebrew

If installed via Homebrew, run:

brew list | grep jdk    # Find Java package name (such as openjdk@8)brew uninstall openjdk@8

Step 3: Clean up environment variables

Open the configuration file in the user directory (based on the shell used):
```
nano ~/.bash_profile    # or ~/.zshrc, ~/.bashrc
```
Delete or comment outJAVA_HOMEandPATHJava-related lines.

3. Linux system uninstall Java 8

Step 1: Uninstall OpenJDK or Oracle JDK

Uninstall OpenJDK：

sudo apt-get remove openjdk-8-jdk openjdk-8-jre  # Debian/Ubuntu
sudo yum remove java-1.8.0-openjdk               # CentOS/RHEL

Uninstall Oracle JDK：
If you download and install it through the official website, directly delete the installation directory:
```
sudo rm -rf /usr/lib/jvm/jdk1.8.0
```

Step 2: Clean up environment variables

Check and edit the following files to delete Java-related configurations:

sudo nano /etc/environment         # Delete JAVA_HOMEsudo nano /etc//   # Delete or comment related lines

4. Verify whether the uninstallation is successful

Run at a terminal or command prompt:

java -version
javac -version

If displayedcommand not foundOr if the Java 8 version is not found, the uninstallation is successful.

Summarize

Windows: Uninstall the program → Delete the residual files → Clean up environment variables and registry.
macOS: Delete the Java directory → Check Homebrew → Clean the configuration file.
Linux: Uninstall the package → Delete the installation directory → Clean up environment variables.

After following the above steps, Java 8 will be completely cleaned up and will not affect the installation of other versions.

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