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What will be the output of the following program?

import java.util.*;
public class AddStrings<T> {
    String add(Collection<?> obj) {
        String result = "";
        for (Object o : obj)
            result += o;
        return result;
    }
    public static void main(String args[]) {
        List<?> numbers = Arrays.asList(1, 2, 3);
        System.out.println("Sum = " + new AddStrings().add(numbers));
    }
}


Sum = 6
Sum = 123
Some other output
Compilation Error or Runtime Error

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Topic: Why Collections Are Generic In Java?

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