接口+工厂方法设计实现（面向对象程序设计）

创建一个Cycle接口及其Unicycle、Bicycle和Tricycle实现。对每种类型的Cycle都创建相应的工厂，然后编写代码使用这些工厂。（工厂产生的对象能被管理，可以输出当前产生的对象总数。
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public class Bicycle implements Cycle {
    @Override
    public void ride() {
        System.out.println("自行车");
    }
}

// BicycleFactory.java
public class BicycleFactory implements CycleFactory {
    private static int totalCount = 0;

    @Override
    public Cycle createCycle() {
        totalCount++;
        return new Bicycle();
    }

    @Override
    public int getTotalCount() {
        return totalCount;
    }
}

public interface Cycle {
    void ride();
}
public interface CycleFactory {
    Cycle createCycle();
    int getTotalCount();
}

public class Main {
    public static void main(String[] args) {
        CycleFactory unicycleFactory = new UnicycleFactory();
        CycleFactory bicycleFactory = new BicycleFactory();
        CycleFactory tricycleFactory = new TricycleFactory();

        Cycle unicycle = unicycleFactory.createCycle();
        Cycle bicycle = bicycleFactory.createCycle();
        Cycle tricycle = tricycleFactory.createCycle();

        unicycle.ride();
        bicycle.ride();
        tricycle.ride();

        System.out.println("总共创建了 " + unicycleFactory.getTotalCount() + " 辆独轮车，"
                + bicycleFactory.getTotalCount() + " 辆自行车，" + tricycleFactory.getTotalCount() + " 辆三轮车。");
    }
}

public class Tricycle implements Cycle {
    @Override
    public void ride() {
        System.out.println("三轮车");
    }
}
// TricycleFactory.java
public class TricycleFactory implements CycleFactory {
    private static int totalCount = 0;

    @Override
    public Cycle createCycle() {
        totalCount++;
        return new Tricycle();
    }

    @Override
    public int getTotalCount() {
        return totalCount;
    }
}

public class Unicycle implements Cycle {
    @Override
    public void ride() {
        System.out.println("独轮车");
    }
}
public class UnicycleFactory implements CycleFactory {
    private static int totalCount = 0;

    @Override
    public Cycle createCycle() {
        totalCount++;
        return new Unicycle();
    }

    @Override
    public int getTotalCount() {
        return totalCount;
    }
}