In Java, which constructor will be chosen when parameter is null

Question

Let's say I have this code:

public class A{
    public A(String b){}
    public A(Cursor c){}
    public A(SomeClass n){}
}

Now I want to create an instance of A but I don't know which constructor will select when the only parameter is null:

A someA = new A(null);

How should I manage this and figure it out ?

UPDATE

I have test this, it wont be compile with null but when I use a null object it will consider what is type of object like:

String n = null;
A someA = new A(n);

it will execute public A(String b){}

Is that safe ?

What about avoidining passing null altogether? This looks like a XY problem so why don't you explain what you want to do first? — fge, May 28 '15 at 07:20
consider that is exactly what I want to compile, it's a big problem. — Pejman, May 28 '15 at 07:22
Have you read the duplicate? The accepted answer perfectly answers this and your new question. — Makoto, May 28 '15 at 07:34

score 0 · Answer 1 · answered May 28 '15 at 07:22

0

It ll result in compilation error, as the method call is ambiguous.

answered May 28 '15 at 07:22

Soumitri Pattnaik

1 Answers1