How is ambiguity in selecting from overloaded methods resolved in Java?

Question

package org.study.algos;
public class Study {

    public static void main(String[] args) {
       A a = new A();
       a.m1(null);
    }
 }
 class A {
    public v         


        

Answer 1

null value can be set to reference of any type. All overloaded methods you have are in one inheritance hierarchy Object <- String, the least general one is being choosen. But if you had two overloaded methods that are not in the same hierarchy, then you'd get compilation error about ambigous methods.