/! is used to run last executed statement.
Step 1: Open terminal and execute the command jshell.
$jshell
| Welcome to JShell -- Version 10.0.2
| For an introduction type: /help intro
jshell>
Step 2: Execute below statements.
System.out.println("Hello")
System.out.println("***********")
jshell> System.out.println("Hello")
Hello
jshell> System.out.println("***********")
***********
Step 3: Execute the command /! To re run last executed statement.
jshell> /!
System.out.println("***********")
***********
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