JDK 今天发布几个早期更新预览版本，分别是：

Early Access build for JDK 9 b48 <https://jdk9.java.net/download/>
改进记录 <http://www.java.net/download/jdk9/changes/jdk9-b48.html>

Early Access build for JDK 8u40 b23 <http://jdk8.java.net/download.html>
改进记录 <http://www.java.net/download/jdk8u40/changes/jdk8u40-b23.html>

Early Access build for JDK 7u80 b05 <https://jdk7.java.net/download.html>
改进记录<http://download.java.net/jdk7u80/changes/jdk7u80-b05.html>