jdk-11.0.12_linux-x64_bin.tar.gz
2.安装sudo mkdir /usr/local/mysoftware
sudo tar zxvf jdk-11.0.12_linux-x64_bin.tar.gz -C /usr/local/mysoftware
3.配置环境变量sudo vim /etc/profile
在文件最后添加下列内容：
export JAVA_HOME=/usr/local/mysoftware/jdk-11.0.12
export JAVA_BIN=$JAVA_HOME/bin
export JAVA_LIB=$JAVA_HOME/lib
export CLASSPATH=.:$JAVA_LIB/tools.jar:$JAVA_LIB/dt.jar
export PATH=$JAVA_BIN:$PATH
source /etc/profile
5.检查是否安装完成java -version
