Remove JDK Instructions

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### 🔧 **To Remove a Specific JDK (e.g., Java 11 or Java 17):**

First, list installed Java versions:

sudo update-alternatives --config java

Then, uninstall the unwanted version. For example:

– To remove **Java 11**:

sudo apt remove openjdk-11-jdk

– To remove **Java 17**:

sudo apt remove openjdk-17-jdk

You can also remove the runtime only (JRE):

sudo apt remove openjdk-11-jre
sudo apt remove openjdk-17-jre

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### 🧹 Optional Cleanup

sudo apt autoremove

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Let me know which version you want to keep, and I’ll give you the exact command.

– They were **manually installed**, not through APT.
– Or their directories were **not removed** during uninstall.

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### ✅ To Completely Remove a JDK from `/usr/lib/jvm`:

1. **Check what's in the folder**:

ls -l /usr/lib/jvm

You’ll probably see:

java-11-openjdk-amd64
   java-17-openjdk-amd64
   openjdk-11
   openjdk-17

2. **Delete the one you don’t want**:
For example, to delete **Java 11**:

sudo rm -rf /usr/lib/jvm/java-11-openjdk-amd64 /usr/lib/jvm/openjdk-11

Or to delete **Java 17**:

sudo rm -rf /usr/lib/jvm/java-17-openjdk-amd64 /usr/lib/jvm/openjdk-17

3. **Clean up alternatives if needed**:

sudo update-alternatives --remove-all java
   sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-17-openjdk-amd64/bin/java 1

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Let me know which JDK you want to **keep**, and I’ll tailor the command accordingly.