桥接模式

public interface Bridge {
    void tagetLand();
}

public class Forest implements Bridge {
    public void tagetLand() {
        System.out.println("树林，吃食");
    }
}

public abstract class Animal {
    public Bridge bridge;
    public abstract void willToDo();
}

public class Chick extends Animal {
    public void willToDo() {
        System.out.println("过河");
    }
}

Animal chick = new Chick();
chick.bridge = new Forest();
chick.willToDo();
chick.bridge.tagetLand();