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sudo apt update
sudo apt-get upgrade
sudo apt install build-essential
gcc -v
g++ -v
# 版本是9.3, 安装低版本
# 添加源
sudo gedit /etc/apt/sources.list
'''
deb http://dk.archive.ubuntu.com/ubuntu/ xenial main
deb http://dk.archive.ubuntu.com/ubuntu/ xenial universe
'''
sudo apt update
sudo apt install g++-5 gcc-5
# 设置优先级
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 100 && 
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 100 && 
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-5 100 && 
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-9 100
# 修改gcc/g++ 默认版本， 根据提示输入编号
sudo update-alternatives --config gcc && 
sudo update-alternatives --config g++
# 显示 版本是 5.3.1
gcc -v
g++ -v

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sudo apt install -y autoconf zip libx11-dev libxext-dev libxrender-dev libxtst-dev libxt-dev libcups2-dev libfontconfig1-dev libasound2-dev

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# 使用 java11 作为boot jdk
sudo apt install openjdk-11-jdk
java -version

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# 你的目录
cd /home/lei/CLionProjects/
# download openjdk11 源码
# 使用 git
git clone --depth 1 -b master https://github.com/AdoptOpenJDK/openjdk-jdk11.git
# 或使用 Mercurial
# hg clone http://hg.openjdk.java.net/jdk/jdk11
cd openjdk-jdk11
# 配置编译环境
bash ./configure --with-target-bits=64 --with-debug-level=slowdebug --with-num-cores=4 --with-memory-size=8192 --disable-warnings-as-errors
# 开始编译
make all

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cd build/linux-x86_64-normal-server-slowdebug/
./jdk/bin/java -version

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sudo apt install openjdk-8-jdk
sudo update-alternatives --config java # 修改默认的版本，输入编号
java -version # 显示 8
cd /home/lei/CLionProjects/
git clone --depth 1 -b master https://github.com/AdoptOpenJDK/openjdk-jdk8u.git
cd openjdk-jdk8u
sudo bash ./configure --with-target-bits=64 --with-debug-level=slowdebug --with-num-cores=4 --with-memory-size=8192
make all
build/linux-x86_64-normal-server-slowdebug/jdk/bin/java -version