Java™ How to Program, Seventh Edition

7.11. Variable-Length Argument Lists

With variable-length argument lists, you can create methods that receive an unspecified number of arguments. An argument type followed by an ellipsis (...) in a method’s parameter list indicates that the method receives a variable number of arguments of that particular type. This use of the ellipsis can occur only once in a parameter list, and the ellipsis, together with its type, must be placed at the end of the parameter list. While programmers can use method overloading and array passing to accomplish much of what is accomplished with “varargs,” or variable-length argument lists, using an ellipsis in a method’s parameter list is more concise.

Figure 7.20 demonstrates method average (lines 7–16), which ...