How to save current JShell session in Java 9?

Java 9 introduced a new feature to create a new feature called REPL (Read-Evaluate-Print -Loop)'s new featureJShell. It is a command line prompt tool for evaluating Java code without writing a complete program.

When we can enter code or internal commands in JShell, we need to use it during the current session. When we can close JShell and log in again, all the code we entered previously is lost. An internal command has been implemented to save all code entered into a file using the "/save" command.

<strong>/ save [file-path]
/ save -all [file-path]
/ save -history [file-path]
/ save -start [file-path]</strong>

• /save [file-path]: Without arguments, this command saves all active codes entered during the session to the file entered in the second argument middle. Please note that mistyped codes and internal commands are not saved in the file.
• /save -all [file path]: Saves all active code in the file entered as the second argument during the session on error and on startup. Internal orders entered are not recorded.
• /save -history [file path]: Saves all code and commands entered during the session in the file entered in the second argument. Even internal commands are saved in files.
• /save -start: Save all codes started when JShell is started.

In the code snippet below, the code entered in JShell is saved in a different file, depending on the options entered after the "/save" command. We need to save these files in a directory with the extension ".jsh"

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

jshell> int x = 20
x ==> 20

jshell> double y = 30
y ==> 30.0

jshell> public int sum(int a, int b) {
...>       return a + b;
...>    }
| created method sum(int,int)

jshell> String str = "TutorialsPoint"
str ==> "TutorialsPoint"

jshell> /list

1 : int x = 20;
2 : double y = 30;
3 : public int sum(int a, int b) {
       return a + b;
    }
4 : String str = "TutorialsPoint";

jshell> int var = "error"
|   Error:
|   incompatible types: java.lang.String cannot be converted to int
|   int var = "error";
|   ^-----^

jshell> /save C:\Users\User\save.jsh

jshell> /save -all C:\Users\User\saveAll.jsh

jshell> /save -history C:\Users\User\saveHistory.jsh

jshell> /save -start C:\Users\User\saveStart.jsh</strong>

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