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What are the different "/vars" commands in JShell in Java 9?
JShell is an interactive command-line tool introduced in Java 9. It is also called a REPL tool that takes input, evaluates it, and prints output to the user.
In the JShell tool, it's possible to list all variables created by using the internal command "/vars". We have different "/vars" commands available in the JShell tool as listed below.
/vars /vars [ID] /vars [Variable_Name] /vars -start /vars -all
- /vars: This command allows to us display the list of all active variables of the current session.
- /vars [ID]: This command displays the variable and its value, corresponding to the entered ID. This ID corresponds to the name of the variable that JShell assigned to expression ($ 1, $ 2…).
- /vars [Variable_Name]: This command displays the variable [Variable_Name] and its value.
- /vars -start: This command allows us to display all variables that we have added to the JShell startup script.
- /vars - all: This command displays the list of all active, inactive, and loaded variables at startup.
In the below code snippet, created expression and variable. Then we can able to apply different "/vars" commands.
C:\Users\User>jshell | Welcome to JShell -- Version 9.0.4 | For an introduction type: /help intro jshell> 2 + 4 $1 ==> 6 jshell> /vars | int $1 = 6 jshell> int x = 20 x ==> 20 jshell> /vars | int $1 = 6 | int x = 20 jshell> /vars $1 | int $1 = 6 jshell> /vars x | int x = 20 jshell> /vars -all | int $1 = 6 | int x = 20 jshell> /drop x | dropped variable x jshell> /vars -all | int $1 = 6| int x = (not-active)
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