Is there a way to remove imports in JShell?

Question

I'm discovering JShell and I discovered the imports added in by default:

jshell> /imports
|    import java.io.*
|    import java.math.*
|    import java.net.*
|    import java.nio.file.*
|    import java.util.*
|    import java.util.concurrent.*
|    import java.util.function.*
|    import java.util.prefs.*
|    import java.util.regex.*
|    import java.util.stream.*

After doing that I added my own import using the following command:

import java.lang.Math

Is there a way to remove the latter import without killing the active session/restarting?

I've tried to issue the /edit command, remove the import, click accept and click exit, but that didn't do the trick.

As stated in the comments, /reset removes the import, but it also removes anything else previously input in the session. Is there a specific way to ONLY remove the import statement?

@MarounMaroun Indeed, but that also removes every other active stuff. — Thibstars, Oct 18 '17 at 11:17
@MarounMaroun Reset would not remove default imports. @ Thibstars is that what you intend to do? — Naman, Oct 18 '17 at 15:59
@nullpointer No, I'm just looking to remove the import I added myself. I've added an answer myself now that suits my needs. — Thibstars, Oct 18 '17 at 16:24

score 5 · Accepted Answer · edited Oct 18 '17 at 16:32

After some searching, I managed to find a solution. It's a combination of /list (to know which line to remove) and /drop.

/drop [name[ name...]|id[ id...]]

Drops a snippet, making it inactive. Provide either the name or the ID of an import, class, method, or variable. For more than one snippet, separate the names and IDs with a space. Use the /list command to see the IDs of code snippets.

jshell> import java.lang.Math

jshell> /list

   1 : import java.lang.Math;

jshell> /drop 1

jshell> /imports
|    import java.io.*
|    import java.math.*
|    import java.net.*
|    import java.nio.file.*
|    import java.util.*
|    import java.util.concurrent.*
|    import java.util.function.*
|    import java.util.prefs.*
|    import java.util.regex.*
|    import java.util.stream.*

score 0 · Answer 2 · answered Nov 12 '21 at 11:03

For those who are searching for a way to auto-import the common libraries:

jshell JAVASE

That will import ~200 packages automatically. Like we havent't had seen enough of unworldly design decisions in the Java world, a smile may disappear when addressing the first List:

jshell> List<Duration> durations = new ArrayList<>();
|  Error:
|  reference to List is ambiguous
|    both class java.awt.List in java.awt and interface java.util.List in java.util match
|  List<Duration> durations = new ArrayList<>();
|  ^--^
|  Error:
|  reference to Duration is ambiguous
|    both class javax.xml.datatype.Duration in javax.xml.datatype and class java.time.Duration in java.time match
|  List<Duration> durations = new ArrayList<>();
|       ^------^

That can be fixed, but one needs to create a startup script:

Start jshell JAVASE
Show imports: /imports
Copy that to a file, remove all lines with java.awt and other unwanted imports
Save these imports to a file jshell-imports
Start jshell jshell-imports

jshell> List<Duration> durations = new ArrayList<>();
durations ==> []

Of course, the file has to be recreated for each Java update.

Is there a way to remove imports in JShell?

2 Answers2

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