JShell is an interactive tool that enables us to execute java code and displays the output instantly. JShell is the REPL(Read-Evaluate-Print-Loop) tool that runs from the command-line prompt. If we need to avoid the compilation-errors in JShell, then we must declare those variables before using it. The error message in JShell can use the notation "^--^" to highlight an error.
In the below code snippet, the declaration of an int variable "div" attempts to use variables: num1, and num2 that has not been declared, so JShell reports a compilation error, indicating that the compiler was unable to find those variables.
C:\Users\User>jshell | Welcome to JShell -- Version 9.0.4 | For an introduction type: /help intro jshell> int div = num1 / num2 | Error: | cannot find symbol | symbol: variable num1 | int div = num1 / num2; | ^--^ | Error: | cannot find symbol | symbol: variable num2 | int div = num1 / num2; | ^--^
In the below code snippet, JShell displays the variable’s name: num1 and num2 followed by double equal and greater-than signs (==>).
jshell> int num1 = 35 num1 ==> 35 jshell> int num2 = 7 num2 ==> 7 jshell> int div = num1 / num2 div ==> 5