jshell: Add Modules

There are two way to add modules to jshell.

 

Add module at the time of launching jshell

Syntax

jshell --add-modules module1 module2 …. moduleN

 

Example

jshell --add-modules java.logging

 

Add module using /env command

Syntax

env --add-modules module1 module2 …. moduleN

 

Example

/env --add-modules java.logging

 

Follow below steps to add logging module and work with it.

 

Step 1: Open terminal and execute the command jshell.

$jshell
|  Welcome to JShell -- Version 10.0.2
|  For an introduction type: /help intro

jshell>

 

Step 2: Add logging module by executing below command.

/env --add-modules java.logging

jshell> /env --add-modules java.logging
|  Setting new options and restoring state.

jshell> 

 

Step 3: Import logging package by executing below command.

import java.util.logging.*;

 

Step 4: Get an instance of Logger by executing below statement.

Logger logger = Logger.getLogger("demo");

 

Step 5: Use methods of Logger to log the information.

jshell> import java.util.logging.*;

jshell> Logger logger = Logger.getLogger("demo");
logger ==> java.util.logging.Logger@887af79                

jshell> logger.info("Hello World")
Apr 28, 2020 12:31:10 PM REPL.$JShell$13 do_it$
INFO: Hello World

 

 

 

 

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