How does this java code work?

I have this code

class NumberMachine { 
   public static void main(String [] args) { 
     Integer wi1 = new Integer("420"); 
     int i = 101; 
     Integer wi2 = i*420/101; 

     if(wi1 == wi2)
       System.out.print(" =="); 
     if(wi1.equals(wi2))
       System.out.print(" equal"); 
     float f = 1.23f; 
     new NumberMachine().printIt(f); 
  } 

  void printIt(Float f) { 
    System.out.println(" Float"); 
  } 

  void printIt(double d) { 
    System.out.println(" double"); 
  } 
}

Why is the result "equal double" but not "equal floating"?

Solution

To determine which method should be called, the compiler will follow the following list, such as JLS #5.3 and JLS #15.12 2:

>Identity transformation (§ 5.1.1) > extended original transformation (section 5.1.2) = = > printit (double) works here > extended reference transformation (section 5.1.5) > a boxing transformation (§ 5.1.7) optionally followed by a widened reference transformation = = > if there is no printit (double), printit (float) > an unboxing transformation (section 5.1.8) will be called here, optionally followed by a widened primitive transformation