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How does Java compiler resolve the ambiguity to decide which methods to call?

 
Ranch Hand
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While going through some mock test i found this question.
This is not at all clear that when we pass null in the method the subtester version of the method is being called.


class Tester {
void test(Object s) { System.out.println ("Object version"); }
void test(Tester s) { System.out.println ("Tester version"); }
void test(SubTester s) { System.out.println ("SubTester version"); }

// Not compilable any more if you uncomment the line
// since String and Tester are siblings
// void test(String s) { System.out.println ("String version"); }

public static void main (String args[]) {
Tester c = new Tester ();
// Ambiguous, the most specific one which fit will be call
c.test (null); // SubTester version
c.test (new Object()); // Object version
}
}

class SubTester extends Tester{
}
 
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See our SCJP FAQ: What is a most-specific method?
 
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