JShell is an interactive tool (REPL) introduced in Java 9. We can execute snippets like expressions, variables, methods, classes, and etc without a main () method in the JShell tool.
We can execute any prior snippet by simply typing /id, which indicates the snippet’s ID. For instance, if we type "/1", then JShell can display the first snippet that we have entered, executes it, and shows the result. We can re-execute the last snippet that we have entered (whether it is valid or invalid) by using "/!".
In the below code snippet, we have created a set of snippets, and execute those snippets by using /1, /2, /3, and /4.
<strong>C:\Users\User>jshell
| Welcome to JShell -- Version 9.0.4
| For an introduction type: /help intro
jshell> 2+10
$1 ==> 12
jshell> String s = "Tutorialspoint"
s ==> "Tutorialspoint"
jshell> System.out.println("Tutorialspoint")
Tutorialspoint
jshell> int num1 = 25
num1 ==> 25
jshell> /1
2+10
$5 ==> 12
jshell> /2
String s = "Tutorialspoint";
s ==> "Tutorialspoint"
jshell> /3
System.out.println("Tutorialspoint")
Tutorialspoint
jshell> /4
int num1 = 25;
num1 ==> 25</strong>立即学习“Java免费学习笔记（深入）”；
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在下面的代码段中，我们可以使用"/!"命令重新执行上一个代码段。
<strong>jshell> 2+5 $1 ==> 7 jshell> 10-6 $2 ==> 4 jshell> /1 2+5 $3 ==> 7 jshell> /! 2+5 $4 ==> 7</strong>
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