Question

I’m unfamiliar with the parameter syntax in doInBackground(Params... params)

What is this type of thing called, and how do I utilize it?

Answer 1

As devA and VVV have said, that is called “varargs”. Effectively, the following two lines of code are equivalent:

public void makeLemonade(String[] args) {

and

public void makeLemonade(String... args) {

the code inside the method would be the same, but when it was called, they would be called differently. The first would need to be called like this:

makeLemonade(new String[]{"lemon1", "lemon2", "lemon3"});

while the second one’s method signature could have 0 to (an assumed)infinite number of arguments, but they would all need to be String arguments. All of the following calls would work:

makeLemonade("lemon1");
makeLemonade("lemon4", "lemon7", "lemon11", "lemon12"); 
makeLemonade();
// ... etc ...

A subtle difference between the two is that you can call makeLemonade() legally here if you’re using varargs.