How to modify JShell's default editor in Java 9?

JShell Implementation of REPL (read-evaluate-print loop) that reads code from the command line >, evaluates the given code snippet and print the result back to us.

In JShell, you can use JShell Editor Pad从默认的 JShell 编辑器编辑代码>. We can also use the "/set" command to modify the default editor in order to define another editor. This editor can be used when the "/edit" command is launched. In order to do this, we simply launch the "/set editor [editor]" command.

Suppose we want to set the Notepad application as the default program for editing code, then just type the command: "/set editor notepad.exe".

<strong>jshell> /set editor
|  /set editor -default

jshell> int i = 20
i ==> 20

jshell> double j = 30.0
j ==> 30.0

jshell> /set editor notepad.exe
|  Editor set to: notepad.exe

jshell> /edit</strong>

Now, if we want to use the "/edit" command to modify the code entered in the command prompt, we can open a Notepad application as follows.

If we can modify the JShell editor by entering <. because the program does not exist or path is incorrect when we execute jshell cannot display error message executing>/edit" command. When trying to open the editor we just get an error message as shown below.

<strong>jshell> /set editor emacs
|  Editor set to: emacs

jshell> /set editor
|  /set editor emacs

jshell> /edit
|  Edit Error: process IO failure: Cannot run program "emacs": CreateProcess error=2,
  The system cannot find the file specified</strong>

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