Why is new called an operator in Java?

Question

Why is new keyword called an operator in Java?

I know that new dynamically allocates memory in Java for an object and returns a reference to it but why is it called an operator?

Answer 1

Actually, the Java Language Specification does not call new an operator. It writes:

38 tokens, formed from ASCII characters, are the operators.

Operator:

    =   >   <   !   ~   ?   :   ->
    ==  >=  <=  !=  &&  ||  ++  --
    +   -   *   /   &   |   ^   %   <<   >>   >>>
    +=  -=  *=  /=  &=  |=  ^=  %=  <<=  >>=  >>>=

new is simply a keyword that occurs in a class instance creation expression.

I consider this a reasonable definition, as an operator would take operands (or, from the perspective of source code, appear next to an expression), but the class name followed by the argument list is not by itself a valid expression nor it is evaluated to produce a value at runtime.

I suspect the practice of calling new an operator originates from C++, where the new operator could be overloaded independent of the constructor call, to customize the memory allocation strategy. Managed languages such as Java or C# no longer allow such a separation, but the term operator has stuck.

For instance, the C# language specification actually talks about a new operator, and specifies its precedence, but when actually specifying its meaning only talks about the 3 expression types than can be formed with a new keyword (object creation, array creation, and delegate creation expressions).

Answer 2

Officially new is not an operator. There is no such word in the Java Language Specification, which is the sole authority in this matter.

There is the class instance creation expression, which involves the keyword new.