EL expressions provide the following operators1:

| Type | Operators | Description | |——|———–|————-| | Arithmetic | +, -1, *, /, div, %, mod, -2 | - / and div are the same, while % and mod are the same. | | Logical | and, &&, or, ||, not, !, empty | | | Relational | ==, eq, !=, ne, <, lt, >, gt, <=, ge, >=, le | - Comparisons can be made against other values, or against boolean, string, integer, or floating point literals. | | Conditional | A ? B : C | It evaluate B or C, depending on the result of the evaluation of A. | | Index | [] | To evaluate expr-a[expr-b], evaluate expr-a into value-a and evaluate expr-b into value-b. If either value-a or value-b is null, return null.

- If value-a is a Map, return value-a.get(value-b). If !value-a.containsKey(value-b), then return null.
- If value-a is a List or array, coerce value-b to int and return value-a.get(value-b) or Array.get(value-a, value-b), as appropriate. If the coercion couldn’t be performed, an error is returned. If the get call returns an IndexOutOfBoundsException, null is returned. If the get call returns another exception, an error is returned.
- If value-a is a JavaBeans object, coerce value-b to String. If value-b is a readable property of value-a, then return the result of a get call. If the get method throws an exception, an error is returned. | | Member | . | - Properties of variables are accessed using the . operator and can be nested arbitrarily.
- The value of a map can be accessed by using the . operator. |

The relative precedence levels of operators from the highest to lowest, left to right are as follows:

  • [] .
  • ()2
  • - 3 not ! empty
  • * / div % mod
  • + - 4
  • < > <= >= lt gt le ge
  • == != eq ne
  • && and
  • || or
  • ? :

  1. The information is from JSP Tutorial. ↩

  2. Used to change the precedence of operators. ↩

  3. unary ↩

  4. binary ↩