method overloading by passing objects

package oops;

public class OLbyPassingObject {
    
    public void m1(String s)
        {      
        System.out.println("String version");
        }
    public void m1(Object o)
    {    
        System.out.println("Object version"); 
    }
    public void m1(double d)
    {
    System.out.println("double version");  
    }


    public static void main(String a[])
    {
    OLbyPassingObject s=new OLbyPassingObject();
    s.m1("java");              // String version
    s.m1(new Object());   // Object version
    s.m1(null);                   // String version
    // if Double wrapper version is there we will get compile time error shows abiguous 
     }

}