Method overloading and null keyword

Question

It would be great if anyone can explain below. Why print(String s) method is called in below example and print(Object o) not called.

package com.example;

public class DemoTest {

    public void print(Object o){
        System.out.println("Object");
    }
    public void print(String s){
        System.out.println("String");
    }
    public static void main(String[] args) {
        DemoTest dt = new DemoTest();
        dt.print(null);

    }
}

Just a follup but what if there was a `print(Integer i)` method. Then what would be chosen? Or is that an error? — Kevin Bowersox, Aug 30 '13 at 15:37

score 1 · Answer 1 · edited May 23 '17 at 12:05

1

Taken from Strange Java null behavior in Method Overloading

"That is because String class extends from Object and hence is more specific to Object. So, compiler decides to invoke that method. Remember, Compiler always chooses the most specific method to invoke."

edited May 23 '17 at 12:05

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answered Aug 30 '13 at 15:34

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You could have just linked it... – Sotirios Delimanolis Aug 30 '13 at 15:36

Method overloading and null keyword

1 Answers1