Question 13

Explanation

SpEL expressions begin with the # symbol and are wrapped in braces: #{expression}.

Properties can be referenced in a similar fashion, starting with a $ symbol and wrapped in braces: ${property.name}.

Property placeholders cannot contain SpEL expressions, but expressions can contain property references:

#{${someProperty} + 2}

In the example above, assume someProperty has value 2, so the resulting expression would be 2 + 2, which would be evaluated to 4.

https://www.baeldung.com/spring-expression-language#operators

https://docs.spring.io/spring-framework/docs/4.2.x/spring-framework-reference/html/expressions.html