java 下载时，经常会看到有两个版本：
比如
http://www.oracle.com/technetwork/cn/java/javase/downloads/jdk8-downloads-2133151-zhs.html

Java SE Development Kit 8u171
Java SE Development Kit 8u172

那我们究竟应该下载哪个版本比较好呢。

简单来说，奇数版本是修复了之前的严重错误的版本。经过了很多测试。
下一代奇数版本，将包括上一代偶数版本所修复的全部bug。

偶数版本，修复了之前严重错误和额外错误的版本。仍需要机构再多测试。

查看网站讨论链接：https://www.reddit.com/r/java/comments/8d3i9e/jdk_8u171_vs_jdk_8u172/?st=jhk8n1q9&sh=49328aa6

官方说明链接:
http://www.oracle.com/technetwork/java/javase/cpu-psu-explained-2331472.html

Java CPU and PSU Releases Explained

October 14, 2014

Starting with the release of Java SE 7 Update 71 (Java SE 7u71) in October 2014, Oracle will release a Critical Patch Update (CPU) at the same time as a corresponding Patch Set Update (PSU) for Java SE 7.

Which Java version should I choose: the CPU or the PSU?

Oracle strongly recommends that all Java SE users upgrade to the latest CPU release available for a release family. Most users should choose the CPU release.

Users should only use the corresponding PSU release if they are being impacted by one of the additional bugs fixed in that version as noted in the release notes.

The subsequent CPU release will contain all of the fixes from the current PSU. For this reason, organizations should test the current PSU in their environment in anticipation of these fixes being included in the next CPU.

What is the difference between a Java CPU and PSU release?

Java SE Critical Patch Updates (CPU) contain fixes to security vulnerabilities and critical bug fixes. Oracle strongly recommends that all Java SE users upgrade to the latest CPU releases as they are made available. Java SE CPU releases are odd numbered versions (i.e. 7u71, 7u65 – see more on Java SE version numbering schemes here).

Java SE Patch Set Updates (PSU) contain all of fixes in the corresponding CPU, as well as additional non-critical fixes. Java PSU releases should only be used if you are being impacted by one of the additional bugs fixed in that version. The release notes call out the additional fixes available in Java SE PSU releases.

Is the cadence of CPU releases changing?

As before, Java SE CPU releases are scheduled for release on the Tuesday closest to the 17th day of January, April, July and October under the normal Oracle Critical Patch Update schedule.

Starting in October 2014 with the release of Java SE 7u71 (CPU) and Java SE 7u72 (PSU), Oracle plans to additionally release a corresponding PSU release along with each CPU release for Java SE 7. PSU releases provide organizations and developers with access to non-critical fixes in addition to the critical fixes contained in the corresponding CPU.

Resources and Additional Information:

发布说明：release note
http://www.oracle.com/technetwork/java/javase/8u-relnotes-2225394.html

This page lists all the release notes for public releases and Bundled Patch Release (BPR) builds of JDK 8.

BPR builds are available only as commercial offerings to Oracle customers.

For a complete listing of release notes for all JDK 8 update releases in a single page, see Release Notes for JDK 8 and JDK 8 Update Releases. This page compiles information for many releases (loading this page through slow connections will take longer than loading release notes for individual releases).

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