Using inherited overloaded methods

Question

I have two classes:

public class ClassA {
    public void method(Number n) {
        System.out.println(\"ClassA: \" + n + \" \" + n.getClass());
    }
}
         


        

Answer 1

  class ClassA
  {
     public void method( Number n )
     {
        System.out.println( "ClassA: " + n + " " + n.getClass() );
     }// void method( Number n )

  }// class ClassA

  public class ClassB
     extends
        ClassA
  {
     public void method( Integer d )
     {
        System.out.println( "ClassB: " + d + " " + d.getClass() );
     }// void method( Integer d )

     public static void main( String[] args )
     {
        ClassB b = new ClassB(); 
        ClassA a = b; 
        a.method( new Integer( 3 )); // 1. ClassA: 3 class java.lang.Integer
        b.method( new Integer( 4 )); // 2. ClassB: 4 class java.lang.Integer
        b.method( new Float( 5.6 )); // 3. ClassA: 5.6 class java.lang.Float
     }// void main( String[] args )

  }// class ClassB

1. Since the two methods are NOT overloaded and the instance is of class a, no dispatch occurs from A to B
2. B has a best match method, then it's chosen
3. B can't handle a parameter of type Float, so A method is chosen