Description:Java SE 9 is the latest update to the Java Platform(General Availability on 21 September 2017). This release includes much awaited new features like the modularization of the Java Platform, better performance, support for new standards, and many other improvements.

1.$ sudo add-apt-repository ppa:webupd8team/java      //添加ppa下载源

2.$ sudo apt-get update    //更新源服务器以获得最新软件包
3.$ sudo apt-get install oracle-java9-installer

4.wenj16@wenj16-Lenovo-YOGA-710-14IKB:/opt$ java -version