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法律研究如何在Java 9中获取JShell文档？
Java 9 引入了一个名为 **JShell** 的新的交互式工具。此工具可用于执行表达式、类、接口、枚举等。
JShell 中提供了包含完整信息的详细文档，以及其内部命令及其各种选项的使用方法。可以使用两个命令访问此文档：“** /help**” 和 “** /?**”。JShell 的文档不仅限于其内部控制的信息，还包括 **Javadoc**。
在下面的代码片段中，可以使用“** /help**”命令获取结果。
jshell> /help | Type a Java language expression, statement, or declaration. | Or type one of the following commands: | /list [<name or id>|-all|-start] | list the source you have typed | /edit <name or id> | edit a source entry referenced by name or id | /drop <name or id> | delete a source entry referenced by name or id | /save [-all|-history|-start] <file> | Save snippet source to a file. | /open <file> | open a file as source input | /vars [<name or id>|-all|-start] | list the declared variables and their values | /methods [<name or id>|-all|-start] | list the declared methods and their signatures | /types [<names or id>|-all|-start] | list the declared types | /imports | list the imported items | /exit | exit jshell | /env [-class-path <path> ] [-module-path <path>] [-add-modules <modules>] ... | view or change the evaluation context | /reset [-class-path <path>] [-module-path <path>] [-add-modules <modules>]... | reset jshell | /reload [-restore] [-quiet] [-class-path <path>] [-module-path <path>]... | reset and replay relevant history -- current or previous (-restore) | /history | history of what you have typed | /help [<command>|<subject>] | get information about jshell | /set editor|start|feedback|mode|prompt|truncation|format ... | set jshell configuration information | /? [<command>|<subject> ] | get information about jshell | /! | re-run last snippet | / | re-run snippet by id | /- | re-run n-th previous snippet | For more information type '/help' followed by the name of a command or a subject. | For example '/help /list' or '/help intro'. | | Subjects: | | intro | an introduction to the jshell tool | shortcuts | a description of keystrokes for snippet and command completion, | information access, and automatic code generation | context | the evaluation context options for /env /reload and /reset
**JShell** 打印不同的现有内部命令，并简要介绍其功能，并提供对其用法的更详细说明。为此，我们只需输入命令：“** /help**” 后跟要详细了解的命令名称（例如，“** /set**” 命令）。
jshell> /help /set | | /set | | Set jshell configuration information, including: | the external editor to use, the start-up definitions to use, a new feedback mode, | the command prompt, the feedback mode to use, or the format of output. | | /set editor [-wait] ... | Specify the command to launch for the /edit command. | The <command> is an operating system dependent string. | | /set start <file> | The contents of the specified become the default start-up snippet s and commands. | | /set feedback <mode> | Set the feedback mode describing displayed feedback for entered snippets and commands. | | /set mode <mode>[<old-mode>] -command|-quiet|-delete | Create or update a user-defined feedback mode, optionally copying from an existing mode. | | /set prompt <mode>"<prompt>" "<continuation-prompt>" | Set the displayed prompts for a given feedback mode. | | /set truncation <mode> <length> <selector> ... | Set the maximum length of a displayed value. | | /set format <mode> <field> "<format>" ... | Configure a feedback mode by setting the format of a field when the selector matches. | | /set | Show editor, start, and feedback settings as /set commands. | To show the settings of any of the above, omit the set value. | | To get more information about one of these forms, use /help with the form specified. | For example: /help /set format
我们需要找到在此第三部分中输入的命令，无论是修改 JShell 的返回值（** /set feedback**），修改默认编辑器（** /set editor**），还是修改 JShell 的启动方式（** /set start**）。
jshell> /help /set feedback | Set the feedback mode describing displayed feedback for entered snippets and commands: | | /set feedback [-retain] <mode> | | Retain the current feedback mode for future sessions: | | /set feedback -retain | | Show the feedback mode and list available modes: | | /set feedback | | Where <mode> is the name of a previously defined feedback mode. | You may use just enough letters to make it unique. | User-defined modes can be added, see '/help /set mode' | | When the -retain option is used, the setting will be used in this and future | runs of the jshell tool. | | The form without <mode> or -retain displays the current feedback mode and available modes.
更新于： 2020年4月14日
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