Explain the difference between $message and $$message?
$message is used to store variable data. $$message can be used to store variable of a variable. Data stored in $message is fixed while data stored in $$message can be changed dynamically.
E.g. $var1 = â€˜Variable 1â€™
This can be interpreted as $ Variable 1=â€˜variable2â€™;
For me to print value of both variables, I will write