Hand----the model of strategy

Abstract class of Duck

Java code

Public abstract class Duck {public
abstract void color (), public
abstract void weight ();
}　　　

Redduck (Red Duck)

Java code

public class Redduck extends Duck {
@Override public
void Color () {
//TODO auto-generated method Stub
System.out.println ("I ' M color is Red"):
}
@Override public
void weight () { c18/>//TODO auto-generated method stub
System.out.println ("I ' m weight is 5kg");
}
　　　　

Color and weight are the common characteristics of each duck, and there is one other characteristic such as flying and calling a duck is not, the toy duck is not called (suppose), the wooden duck can not fly. So we combine the changes into the class without using inheritance.

Fly interface

Java code

Public interface Iflyaction {public
void Fly ();
}