15.18. Additive Operators
The operators + and - are called the additive operators.
AdditiveExpression: MultiplicativeExpression AdditiveExpression + MultiplicativeExpression AdditiveExpression - MultiplicativeExpression
The additive operators have the same precedence and are syntactically left-associative (they group left-to-right).
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 type that is convertible (§5.1.8) to 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 type that is convertible (§5.1.8) to a primitive numeric ...
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