ubuntu16.04安装jdk11

1. 下载jdk11，地址   https://www.oracle.com/java/technologies/javase-jdk11-downloads.html

2. 解压 tar -xzvf jdk-11.0.12_linux-x64_bin.tar.gz

3. 移动到自己“喜欢”的路径 sudo mv jdk-11.0.12 /usr/local/share/

4. 创建环境变量脚本【这里单独创建了,当前shell生效哦，没有使用/etc/profile等】sudo gedit /etc/profile.d/javajdk.sh

5. 添加如下内容

export PATH=$PATH:/usr/local/share/jdk-11.0.12/bin
export JAVA_HOME=/usr/local/share/jdk-11.0.12
export J2SDKDIR=/usr/local/share/jdk-11.0.12

6. source一下，使变量生效

source /etc/profile.d/javajdk.sh

7. 检测一下

 8. 永久生效

修改  ~/.bashrc