Question

I have been working on Java off late, couldn’t figure out what this (String… arg) means in

public static void main(String… arg) {}

Answer 1

... is called varargs and is used to allow for variable number of function parameters.

For example if you declare a function as

void F(int a, int... arr) { }

Then you can call it as:

F(100, 4);

or

F(100, 4, 5);

or

F(100, 4, 5, 6);

The variable arr is actually of type int[] in the body of the function and it contains the parameters, so arr = [4], arr = [4, 5] and arr = [4,5,6] respectively