CODEWITHSUNDEEP
androidsyntaxparametersandroid-asynctask
dfetter88
dfetter88

Reputation: 5391

AsyncTask's doInBackground(Params... params)

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

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

Upvotes: 23

Views: 28096

Answers (3)

Travis
Travis

Reputation: 3757

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.

Upvotes: 59

Sunil Kumar Sahoo
Sunil Kumar Sahoo

Reputation: 53657

Params... params represents a vararg. It was added in J2SE5.0. It means you can pass any number of arguments or you can say array of arguments params[0]

Thanks Deepak

Upvotes: 1

ngesh
ngesh

Reputation: 13501

They are called Var Args.. Just like an array.. U can pass multiple items and just access like params[0].. etc..

Upvotes: 3

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