[JAVA] How to install the language used in Ubuntu and how to build the environment

# install in one time
sudo apt install autoconf bison build-essential libssl-dev libreadline-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm-dev

# install rbenv
# rbenv is tool to manage a few of ruby versions and enable to change ruby ver. project by project.
git clone https://github.com/rbenv/rbenv.git ~/.rbenv
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
echo 'eval "$(rbenv init -)"' >> ~/.bashrc
source ~/.bashrc
git clone https://github.com/rbenv/ruby-build.git "$(rbenv root)"/plugins/ruby-build

# Install ruby
rbenv install --list
rbenv install 2.〇.〇
rbenv global 2.〇.〇

# Instal yarn
# Rails6 needs webpacker, and Webpacker needs yarn to install
curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
sudo apt update
sudo apt install yarn

# Install Rails
gem install rails --no-document

# install webpacker
# inner App
rails webpacker:install

sudo apt install -y ruby ruby-dev build-essential
sudo apt install yarn

sudo gem install rails

# first, install nodejs and npm
sudo apt install -y nodejs npm

# install n-package
sudo npm install n -g

# by n-package, install node
sudo n stable

# uninstal old nodejs and npm, and re-login
sudo apt purge -y nodejs npm
exec $SHELL -l

# confirm
node -v

sudo apt install build-essential

# install rust
curl https://sh.rustup.rs -sSf | sh

# add the pass
source $HOME/.cargo/env

sudo apt update
sudo apt install git
sudo apt install openjdk-11-jdk

# confirmation
java --version

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