What modifiers cannot be used in top-level declarations in JShell in Java 9?

JShell is an interactive tool for learning the Java language and prototyping Java code. It is a REPL (Read-Evaluate-Print-Loop) that immediately evaluates statements, statements and expressions## once entered. #, and print the results immediately in JShell. This tool is run from the command line prompt.

public, protected, private, static, and final Not allowed in top-level declarations, and may be ignored with a warning. Keywords like synchronized, native, abstract, and default top-level methods are not allowed and may raise mistake.

final and static variables. It prints a warning message to the user that reads "Modifier 'final' or 'static' not permitted in top-level declarations, ignored". The Chinese translation of

C:\Users\User\>jshell
| Welcome to JShell -- Version 9.0.4
| For an introduction type: /help intro

jshell> final int x = 0
| Warning:
| Modifier 'final' not permitted in top-level declarations, ignored
| final int x = 0;
| ^---^
x ==> 0

jshell> x = 1
x ==> 1

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is:

jshell> static String str = "Tutorix"
| Warning:
| Modifier 'static' not permitted in top-level declarations, ignored
| static String str = "Tutorix";
| ^----^
str ==> "Tutorix"

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