JShell is an interactive REPL tool to execute and evaluate simple Java programs like variable declarations, statements, expressions, and etc.
When the JShell tool launched, the code has pre-loaded by default. To display this code, we just launch the command "/list -start". It is possible to ask JShell to load them automatically when it starts by using the command: "/set start [-retain] [Type]". The first option "-retain" tells JShell to record the desired [Type] startup for the next JShell sessions. If we don't specify it, the default startup can be launched when opening a new session
/set start [-retain] -File /set start [-retain] -Default /set start [-retain] -none
- /set start [-retain] File: This command tells JShell that when it starts, it must load the content of the file (this file contains code for creating variables, methods, classes, etc.).
- /set start [-retain] -none: This command tells JShell not to load any code/command when it starts.
- /set start [-retain] -Default: This command resets the start of JShell to its default value.
In the below code snippet, we can use "/set start [-retain] -File" command,
jshell> /list -start
s1 : import java.io.*;
s2 : import java.math.*;
s3 : import java.net.*;
s4 : import java.nio.file.*;
s5 : import java.util.*;
s6 : import java.util.concurrent.*;
s7 : import java.util.function.*;
s8 : import java.util.prefs.*;
s9 : import java.util.regex.*;
s10 : import java.util.stream.*;
jshell> /set start -retain save.jsh
jshell> /exit
| Goodbye
C:\Users\User>jshell
| Welcome to JShell -- Version 9.0.4
| For an introduction type: /help intro
jshell> /list -start
s1 : int x = 20;
s2 : double y = 30;
s3 : public int sum(int a, int b) {
return a + b;
}
s4 : String str = "TutorialsPoint";In the below code snippet, we can use "/set start [-retain] -none" command.
jshell> /set start -retain -none jshell> /exit | Goodbye C:\Users\User>jshell | Welcome to JShell -- Version 9.0.4 | For an introduction type: /help intro jshell> /list -start
In the below code snippet, we can use " /set start [-retain] -Default" command.
jshell> /set start -retain -default jshell> /exit | Goodbye C:\Users\User>jshell | Welcome to JShell -- Version 9.0.4 | For an introduction type: /help intro jshell> /list -start s1 : import java.io.*; s2 : import java.math.*; s3 : import java.net.*; s4 : import java.nio.file.*; s5 : import java.util.*; s6 : import java.util.concurrent.*; s7 : import java.util.function.*; s8 : import java.util.prefs.*; s9 : import java.util.regex.*; s10 : import java.util.stream.*;