Java polymorphism - Code Example

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After beginning to see the text of the definition of polymorphism, I do not always understand the meaning of what is said and read some sample code, finally know, in fact, is the literal meaning of "multi-state".

as follows:

 

class A{
    public void Out()
    {
        System.out.println("This is A");
    }
}

class B extends A{
    public void Out()
    {
        System.out.println("This is B");
    }
}

class C extends A{
    public void Out()
    {
        System.out.println("This is C");
    }
}

The above creates three classes, two of which class subclasses.

public  static  void main (String [] args) 
    { 
        A isA = new new A (); 
        isA.Out (); // Output A 
        A isB Is = new new B (); 
        isB.Out (); // Output B 
        A = ISC new new C (); 
        isC.Out (); // output C 
    }