question: facade method facilitating the creation of subshell . subshell is created and run inside command method and shares the same io and naming strtategy . run the obtained shell with commandloop . concode_field_sep PlaceHolder placeHolder concode_field_sep Shell createConsoleShell concode_elem_sep Shell createConsoleShell concode_elem_sep Shell createConsoleShell
target: Shell function ( String arg0 , Shell arg1 , String arg2 , Object arg3 ) { return createSubshell ( arg0 , arg1 , arg2 , arg3 , new EmptyMultiMap < String , Object > ( ) ) ; }