REPL : Java developers new friend
summary
JShell is a Java 9 REPL bundled with the JDK that evaluates snippets, creates implicit results like $1 for quick reuse, and accepts slash commands such as /vars, /imports and /open; it edits and removes snippets, adds external files and jars to the classpath, and launches a simple HttpServer by attaching a HelloHandler and serving a curl response on localhost:8080 (the demo returns "hello ducks"). Tips include default imports, editing in an external editor, and exporting session history.
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