জাভা ৯-এ JShell ডকুমেন্টেশন কিভাবে পাওয়া যায়?

JShell ডকুমেন্টেশন অ্যাক্সেস

জাভা ৯-এ একটি নতুন ইন্টারেক্টিভ টুল হিসেবে JShell পরিচিত করা হয়েছে। এই টুলটি এক্সপ্রেশন, ক্লাস, ইন্টারফেস, এনাম ইত্যাদি এক্সিকিউট করতে ব্যবহৃত হয়।

JShell-এ বিস্তারিত ডকুমেন্টেশন দুটি কমান্ড দিয়ে পাওয়া যায়: /help এবং /?। JShell-এর ডকুমেন্টেশন শুধু ইন্টারন্যাল কমান্ডের তথ্য দেয় না, এছাড়া Javadoc-ও অন্তর্ভুক্ত থাকে।

/help কমান্ডের আউটপুট উদাহরণ

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 বিভিন্ন ইন্টারন্যাল কমান্ড তালিকা করে এবং সংক্ষিপ্ত विवরণ দেয়। কোনো নির্দিষ্ট কমান্ডের বিস্তারিত জানতে /help এর পর সেই কমান্ডের নাম লিখলে হয় (যেমন /help /set)।

/help /set কমান্ডের আউটপুট

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

/help /set feedback কমান্ডের আউটপুট

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.