What does "public Weatherman(Integer... zips) {" mean in java

Question

I am trying to read some Java code from a tutorial, I don't understand the line:

 public Weatherman(Integer... zips) {

• I don't understand what the ... represents if it was just (Integer zips) I would understand that there is a variable of class Integer called zips. But the ... are confusing me.

Answer 1

Those are "varargs," syntactic sugar that allows you to invoke the constructor in the following ways:

new Weatherman()
new Weatherman(98115);
new Weatherman(98115, 98072);
new Weatherman(new Integer[0]);

Under the covers the arguments are passed to the constructor as an array, but you do not need to construct an array to invoke it.

Answer 2

That’s a “vararg”. It can handle any number of Integer arguments, i.e.

new Weatherman(1);

is just as valid as

new Weatherman();

or

new Weatherman(1, 7, 12);

Within the method you access the parameters as an Integer array.