What are the different "/edit" commands in JShell in Java 9?

JShell is a command line tool introduced in Java 9, no need to use the main() method Statements, statements, and expressions can be evaluated. JShell can set up a text editor named JShell Edit Pad, which allows us to modify the code very conveniently, and can be started with the "/edit" command.

Here are the different "/edit" commands used in Jshell.

<strong>/edit
/edit [ID]
/edit [Code_Name]</strong>

• /edit: This command can be used without arguments. The "/edit" command displays all active code in the text editor.
• /edit [ID]: This command displays the code corresponding to the entered ID in the text editor.
• /edit [Code_Name]: This command displays the code corresponding to the entered name in the text editor.

<strong>jshell> int i = 10
i ==> 10

jshell> double j = 20.0
j ==> 20.0

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

jshell> /edit</strong>

Above, we created an integer i, a double y, and a method called "sum". Enter the "/edit" command, and "JShell Edit Pad" will be displayed, as shown below.

We can use the editor to add or modify the code and use the Accept button to verify the settings. We can add a new divide() method and modify the value of the variable "y" as shown below

<strong>jshell> int i = 10
i ==> 10

jshell> double j = 20
j ==> 20.0

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

jshell> /edit
j ==> 50.0
| created method divide(double,double)</strong>

If we only want to display the variable "i" in the JShell Edit Pad, just type the command "/edit i" and 10 will be displayed. In the same way, if we only want to modify the text of "ID 2" (corresponding to variable y), we only need to enter the command "/edit 2" and 20 will be displayed.

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