How can we execute a code snippet by ID in JShell in Java 9?

JShellis an interactive tool (REPL) introduced in Java 9. We can execute snippets likeexpressions,variables,methods,classes, and etc without amain ()method in the JShell tool.

We can execute any prior snippet by simply typing/id, which indicates thesnippet’s ID. For instance, if we type "/1", then JShell can display thefirst snippetthat 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.

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

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。

jshell> 2+5 $1 ==> 7 jshell> 10-6 $2 ==> 4 jshell> /1 2+5 $3 ==> 7 jshell> /! 2+5 $4 ==> 7

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