动态地给一个对象增加一些额外的职责。就增加功能而言，Decorator模式比生成子类更为灵活。
public class Tank
{
public abstract void Shot();
public abstract void Run();
}
public class T50 extends Tank
{
public override void Shot(){};
public override void Run(){};
}
public class T75 extends Tank
{
public override void Shot(){};
public override void Run(){};
}
public abstract class Decorator extends Tank
{
private Tank tank;
public Decorator(Tank tank)
{
this.tank = tank;
}
void Shot()
{
tank.Shot();
}
void Run()
{
tank.Run();
}
}
public class DecoratorA extends Decorator
{
public DecoratorA(Tank tank)
{
super(tank);
}
public override void Shot()
{
红外
base.shot();
}
public override void Run()
{
功能扩展 红外
base.Run();
}
}
public class DecoratorB extends Decorator
{
public DecoratorB(Tank tank)
{
super(tank);
}
public override void Shot()
{
功能扩展 两栖
base.shot();
}
public override void Run()
{
功能扩展 两栖
base.Run();
}
}
class App
{
public static void Main()
{
Tank tank = new T50（）；
DecoratorA da = new Decorator(tank);红外功能
DecoratorB db = new Decorator(da); 红外，两栖
}
}
