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Java can be used in Jupyter notebooks within VS Code by following these steps:

1. Install Java Development Kit (JDK) on your system and ensure that the Java PATH Variable is set.

2. Install the Java extension in VS Code.

3. Install the Jupyter Notebook extension in VS Code.

4. Open a new Jupyter Notebook file in VS Code.

5. Click on the "Kernel" dropdown menu in the top right corner of the notebook editor and select "Java".

6. Now, you can start writing Java code in the notebook cells and run them using the "Run Cell" button or by pressing "Shift + Enter".

7. You can also install additional Java libraries using the "!pip install" command in a notebook cell. For example, "!pip install jupyterlab-java".