Var-args vs widening vs autoboxing in java Yasser Ibrahim @Jobilize

Author: Yasser Ibrahim

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Question 127 / 297: What is the result of compiling and running the following code?

public class Tester {
    static void call(Long x, Long y) {
        System.out.print("Long x, Long y");
    }
    static void call(int... x) {
        System.out.print("int... x");
    }
    public static void main(String[] args) {
        int val = 3;
        call(val, val);
    }
}

A Long x, Long y

B int... x

C Compilation error

D An exception is thrown at run time

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Explanation:

Var-args is always chosen last, but since you cannot widen then autobox (cannot widen from int to long then autobox to Long), int... x is printed

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