Different methods for executing a JShell command in Java

Jshell is an interactive Java Shell tool, it allows us to execute Java code from the shell and shows output immediately. JShell is a REPL (Read Evaluate Print Loop) tool and run from the command line.

Different methods for executing a JShell command:

1. jshell: In this only output come without any description of it. It uses only System.out.println(…) method to print.
   Example:

   C:\Windows\SysWOW64>jshell
   | Welcome to JShell -- Version 13.0.1
   | For an introduction type: /help intro
   
   jshell> int i=10;
   i ==> 10
   
   jshell> int j=20;
   j ==> 20
   
   jshell> int t=i+j;
   t ==> 30
   
   jshell> System.out.println((t+5));
   35
   

   

2. jshell -v: Jshell -v is a type of Java shell in which a little description shows after the user gets output. It uses only the System.out.println(…) method to print.
   Example:
   
   

   C:\Windows\SysWOW64>jshell -v
   |  Welcome to JShell -- Version 13.0.1
   |  For an introduction type: /help intro
   
   jshell> int i=10;
   i ==> 10
   |  created variable i : int
   
   jshell> int j=20;
   j ==> 20
   |  created variable j : int
   
   jshell> int t=i+j;
   t ==> 30
   |  created variable t : int
   
   jshell> System.out.println((t+5));
   35
   

   

3. jshell PRINTING: Jshell PRINTING is another type of Java shell tool in which print method is provided (which is not present in jshell and jshell -v). It uses print(…) and System.out.println(…) method to print.
   Example:

   C:\Windows\SysWOW64>jshell PRINTING
   |  Welcome to JShell -- Version 13.0.1
   |  For an introduction type: /help intro
   
   jshell> int i=4;
   i ==> 4
   
   jshell> int j=9;
   j ==> 9
   
   jshell> int t=i+j;
   t ==> 13
   
   jshell> print(t);
   13
   

   

   If we use the print(..) method in jshell and jshell -v then an error will occur.
   Example:

   C:\Windows\SysWOW64>jshell
   |  Welcome to JShell -- Version 13.0.1
   |  For an introduction type: /help intro
   
   jshell> int i=4;
   i ==> 4
   
   jshell> int j=9;
   j ==> 9
   
   jshell> int t=i+j;
   t ==> 13
   
   jshell> print(t);
   |  Error:
   |  cannot find symbol
   |    symbol:   method print(int)
   |  print(t);
   |  ^---^
   

   

   C:\Windows\SysWOW64>jshell -v
   |  Welcome to JShell -- Version 13.0.1
   |  For an introduction type: /help intro
   
   jshell> int i=4;
   i ==> 4
   |  created variable i : int
   
   jshell> int j=9;
   j ==> 9
   |  created variable j : int
   
   jshell> int t=i+j;
   t ==> 13
   |  created variable t : int
   
   jshell> print(t);
   |  Error:
   |  cannot find symbol
   |    symbol:   method print(int)
   |  print(t);
   |  ^---^