Bridge

Bird

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public abstract class Bird{
    //Fly
    protected FlyBehavior flyBehavior;

    //Swim
    protected SwimBehavior swimBehavior;

    public Bird(FlyBehavior flyBehavior,SwimBehavior swimBehavior){
        this.flyBehavior = flyBehavior;
        this.swimBehavior = swimBehavior;
    }

    public abstract void display();
}

Eagle

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public class Eagle extends Bird {

    public Eagle(FlyBehavior flyBehavior, SwimBehavior swimBehavior){
        super(flyBehavior,swimBehavior);
    }

    @Override
    public void display() {
        System.out.println("我是老鹰");
        flyBehavior.Fly();
        swimBehavior.Swim();
    }
}

Penguin

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public class Penguin extends Bird {

    public Penguin(FlyBehavior flyBehavior, SwimBehavior swimBehavior){
        super(flyBehavior,swimBehavior);
    }

    @Override
    public void display() {
        System.out.println("我是企鹅");
        flyBehavior.Fly();
        swimBehavior.Swim();
    }
}

FlyBehavior

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public interface FlyBehavior {
    void Fly();
}

AbleFly

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public class AbleFly implements FlyBehavior {

    @Override
    public void Fly() {
        System.out.println("展翅翱翔");
    }
}

UnableFly

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public class UnableFly implements FlyBehavior {

    @Override
    public void Fly() {
        System.out.println("扑腾几下飞不起来");
    }
}

SwimBehavior

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public interface SwimBehavior {
    void Swim();
}

AbleSwim

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public class AbleSwim implements SwimBehavior {

    @Override
    public void Swim() {
        System.out.println("鱼翔浅底");
    }
}

UnableSwim

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public class UnableSwim implements SwimBehavior {

    @Override
    public void Swim() {
        System.out.println("扑腾几下就淹死了");
    }
}

Client

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public class Client {
    public static void main(String[] args) {
        //eagle
        Bird bird = new Eagle(new AbleFly(),new UnableSwim());
        bird.display();

        System.out.println("=================================");

        //penguin
        Bird bird1 = new Penguin(new UnableFly(),new AbleSwim());
        bird1.display();
    }
}

Strategy

DiscountStrategy

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public interface DiscountStrategy {
    void getDiscount();
}

GoldCardUserDiscountStrategy

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public class GoldCardUserDiscountStrategy implements DiscountStrategy {
    @Override
    public void getDiscount() {
        System.out.println("您是金卡用户,获得的折扣为: 八折");
    }
}

RegularUserDiscountStrategy

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public class RegularUserDiscountStrategy implements DiscountStrategy {
    @Override
    public void getDiscount() {
        System.out.println("您是普通用户,没有折扣");
    }
}

SilverCardUserDiscountStrategy

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public class SilverCardUserDiscountStrategy implements DiscountStrategy {
    @Override
    public void getDiscount() {
        System.out.println("您是银卡用户,获得的折扣为: 九折");
    }
}

Context

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public class Context {
    private DiscountStrategy discountStrategy;

    public Context(DiscountStrategy discountStrategy) {
        this.discountStrategy = discountStrategy;
    }

    public void discount(){
        discountStrategy.getDiscount();
    }
}

Client

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public class Client {
    public static void main(String[] args) {

        //RegularUser
        Context context = new Context(new RegularUserDiscountStrategy());
        context.discount();
        System.out.println("-----------------------------------------");

        //GoldCardUse
        context = new Context(new GoldCardUserDiscountStrategy());
        context.discount();

        System.out.println("-----------------------------------------");

        //SilverCardUser
        context = new Context(new SilverCardUserDiscountStrategy());
        context.discount();
    }
}

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