The operators +
and -
are called the additive operators. They have the same precedence and are syntactically left-associative (they group left-to-right).
AdditiveExpression:
MultiplicativeExpression
AdditiveExpression+
MultiplicativeExpression
AdditiveExpression
-
MultiplicativeExpression
If the type of either operand of a + operator is String
, then the operation is string concatenation.
Otherwise, the type of each of the operands of the +
operator must be a primitive numeric type, or a compile-time error occurs.
In every case, the type of each of the operands of the binary -
operator must be a primitive numeric type, or a compile-time error occurs.