A base notebook to install the IJava kernel (and ipc proxy) in google colab. Based on https://gist.github.com/tueda/a200b3f747d0fc864be8b4dd09be5a1e

IJava.ipynb

{
  "nbformat": 4,
  "nbformat_minor": 0,
  "metadata": {
    "colab": {
      "name": "IJava.ipynb",
      "provenance": []
    },
    "kernelspec": {
      "name": "java",
      "display_name": "Java"
    },
    "language_info": {
      "name": "java"
    },
    "gpuClass": "standard"
  },
  "cells": [
    {
      "cell_type": "markdown",
      "source": [
        "[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/gist/SpencerPark/447de114fcd3e6a272dc140809462e30)"
      ],
      "metadata": {
        "id": "grpzdqlQ0rsL"
      }
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "id": "IrB2Kt3NqXec"
      },
      "outputs": [],
      "source": [
        "%%sh\n",
        "# Install java kernel\n",
        "wget -q https://github.com/SpencerPark/IJava/releases/download/v1.3.0/ijava-1.3.0.zip \n",
        "unzip -q ijava-1.3.0.zip \n",
        "python install.py\n",
        "\n",
        "# Install proxy for the java kernel\n",
        "wget -qO- https://gist.github.com/SpencerPark/e2732061ad19c1afa4a33a58cb8f18a9/archive/b6cff2bf09b6832344e576ea1e4731f0fb3df10c.tar.gz | tar xvz --strip-components=1\n",
        "python install_ipc_proxy_kernel.py --kernel=java --implementation=ipc_proxy_kernel.py"
      ]
    },
    {
      "cell_type": "code",
      "source": [
        "System.out.println(\"Are you ready?:\");\n",
        "\n",
        "BufferedReader buffer = new BufferedReader(new InputStreamReader(System.in));\n",
        "String line = buffer.readLine();\n",
        "\n",
        "if (!line.equalsIgnoreCase(\"yessir\"))\n",
        "  throw new IllegalArgumentException(\"'yessir' is the only acceptable answer.\");\n",
        "\n",
        "String id = display(\"<b>Countdown:</b> 3\", \"text/html\");\n",
        "for (int i = 3; i >= 0; i--) {\n",
        "    updateDisplay(id, \"<b>Countdown:</b> \" + i, \"text/html\");\n",
        "    Thread.sleep(1000L);\n",
        "}\n",
        "render(\"<b>Liftoff!</b>\", \"text/html\")"
      ],
      "metadata": {
        "id": "H1zYoTexsONt"
      },
      "execution_count": null,
      "outputs": []
    }
  ]
}