Is it possible to convert a string in to a programming statement in apex?

Question

Public String var='public String var1=\'Some text\'; ' ;

I require this string inside var to execute and create a variable "Var1" and assigned with the value "Some text".

Is it possible to do this? If Yes then how will it be possible?

Answer 1

Yes, sort of. It is possible to mimic a Javascript eval() in Apex by making a callout to the executeAnonymous API method.

There are two common ways you can get a response back from executeAnonymous.

1. Throw a deliberate exception at the end of the execute and include the response. Kevin covers this approach in EVAL() in Apex. Secure Dynamic Code Evaluation on the Salesforce1 Platform.
2. I used a variation of this approach but returned the response via the debug log rather than an intentional exception. See Adding Eval() support to Apex.

Using my example the Apex would be something like:

public string var = soapSforceCom200608Apex.evalString(
                'String var1=\'Some text\'; System.debug(LoggingLevel.Error, var1);');

You might not be able to perform the callout during member initialisation or in a constructor.

Incidentally, the Salesforce Stackexchange site is a great place to ask Salesforce specific questions.