参考：https://github.com/SpencerPark/IJava
一、环境（java核心需要jdk9以上支持，可在https://www.oracle.com/java/technologies/javase-jdk15-downloads.html下载）
已安装java，版本如下：
[root@localhost ~]# java -version
java version "15.0.1" 2020-10-20
Java(TM) SE Runtime Environment (build 15.0.1+9-18)
Java HotSpot(TM) 64-Bit Server VM (build 15.0.1+9-18, mixed mode, sharing)
二、java核心下载：
(python) [root@localhost ~]# wget https://github.com/SpencerPark/IJava/releases/download/v1.2.0/ijava-1.2.0.zip
三、安装过程
1、解压：
(python) [root@localhost ~]# unzip ijava-1.2.0.zip
生成java目录和install.py安装文件
2、执行安装：
(python) [root@localhost ~]# python install.py --sys-prefix
install.py:164: DeprecationWarning: replace is ignored. Installing a kernelspec always replaces an existing installation
install_dest = KernelSpecManager().install_kernel_spec(
Installed java kernel into "/root/miniconda3/envs/python/share/jupyter/kernels/java"
3、查看安装核心情况
(python) [root@localhost ~]# jupyter kernelspec list
Available kernels:
java /root/miniconda3/envs/python/share/jupyter/kernels/java
python3 /root/miniconda3/envs/python/share/jupyter/kernels/python3
4、移除核心
(python) [root@localhost ~]# jupyter kernelspec remove java
5、模拟运行核心
(python) [root@localhost ~]# jupyter console --kernel=python3 #模拟运行python3核心
Jupyter console 6.2.0
Python 3.8.5 | packaged by conda-forge | (default, Sep 16 2020, 18:01:20)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.19.0 -- An enhanced Interactive Python. Type '?' for help.
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(python) [root@localhost ~]# jupyter console --kernel=java #模拟运行java核心
Jupyter console 6.2.0
Python 3.8.5 | packaged by conda-forge | (default, Sep 16 2020, 18:01:20)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.19.0 -- An enhanced Interactive Python. Type '?' for help.
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