Operators

In addition to the . and [] operators discussed in Value and Method Expressions, the EL provides the following operators, which can be used in rvalue expressions only.

Arithmetic: +, - (binary), *, / and div, % and mod, - (unary).
String concatenation: +=.
Logical: and, &&, or, ||, not, !.
Relational: ==, eq, !=, ne, <, lt, >, gt, <=, ge, >=, le. Comparisons can be made against other values or against Boolean, string, integer, or floating-point literals.
Empty: The empty operator is a prefix operation that can be used to determine whether a value is null or empty.
Conditional: A ? B : C. Evaluate B or C, depending on the result of the evaluation of A.
Lambda expression: ->, the arrow token.
Assignment: =.
Semicolon: ;.

The precedence of operators, highest to lowest, left to right, is as follows:

[] .
() (used to change the precedence of operators)
- (unary) not ! empty
* / div % mod
+ - (binary)
+=
<> <= >= lt gt le ge
== != eq ne
&& and
|| or
? :
->
=
;