How to check a boolean condition in EL?

Question

Is this correct?

<c:if test="${theBooleanVariable == false}">It's false!</c:if>

Or could I do this?

<c:if test="${!theBooleanVariable}">It's false!</c:if>

Answer 1

You can have a look at the EL (expression language) description here.

Both your code are correct, but I prefer the second one, as comparing a boolean to true or false is redundant.

For better readibility, you can also use the not operator:

<c:if test="${not theBooleanVariable}">It's false!</c:if>

Answer 2

Both works. Instead of == you can write eq

Answer 3

You can check this way too

<c:if test="${theBooleanVariable ne true}">It's false!</c:if>