9.5 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

• ? :

• ->

• =

• ;