每个jdk的升级版本包括奇数版本和偶数版本，如Java 8 Update 73 (8u73)和Java 8 Update 74 (8u74)。应该怎选择哪个版本？
生产环境选8u73；测试环境可选8u74；
Each release has an odd (CPU) and an even (PSU) number. So in this case, 73 is the CPU (critical fixes) and 74 is the PSU (critical plus non-critical fixes)
General recommendation from oracle in a production environment is to use the CPU releases and start testing the PSU release in your test environments to prepare for the next CPU which will contain the previous PSU plus any new critical updates.
jre、server jre、jdk三个版本如何选择？
Which Java package do I need?
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Software Developers: JDK (Java SE Development Kit). For Java Developers. Includes a complete JRE plus tools for developing, debugging, and monitoring Java applications.
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Administrators running applications on a server: Server JRE (Server Java Runtime Environment) For deploying Java applications on servers. Includes tools for JVM monitoring and tools commonly required for server applications, but does not include browser integration (the Java plug-in), auto-update, nor an installer. Learn more
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End user running Java on a desktop: JRE: (Java Runtime Environment). Covers most end-users needs. Contains everything required to run Java applications on your system.
