Java中的工厂模式

1.简单工厂模式

public class FactorySimple {
    public static Vehicle produce(String type) {
        Vehicle vehicle = null;
        if (type.equals("car")) {
            vehicle = new Car();
            return vehicle;
        }
        if (type.equals("bus")){
            vehicle = new Bus();
            return vehicle;
        }
        if (type.equals("bicycle")){
            vehicle = new Bicycle();
            return vehicle;
        }
        return vehicle;
    }
}

public interface Vehicle {
    void run();
}

public class Car implements Vehicle{
    @Override
    public void run() {
        System.out.println("car run...");
    }
}

public class Bus implements Vehicle{
    @Override
    public void run() {
        System.out.println("bus run...");
    }
}
public class Bicycle implements Vehicle {
    @Override
    public void run() {
        System.out.println("bicycle run...");
    }
}

 public static void main(String[] args) {
        SpringApplication.run(FactoryPatternDemoApplication.class, args);
        Vehicle vehicle = FactorySimple.produce("bicycle");
        vehicle.run();
}

2.常规工厂模式

public interface Animal {
    public void run();
}
public class Cat implements Animal{
    @Override
    public void run() {
        System.out.println("Cat run...");
    }
}
public class CatFactory implements FactoryNormal{
    @Override
    public Animal produce() {
        return new Cat();
    }
}
public class Dog implements Animal {
    @Override
    public void run() {
        System.out.println("Dog run...");
    }
}
public class DogFactory implements FactoryNormal{
    @Override
    public Animal produce() {
        return new Dog();
    }
}
public interface FactoryNormal {
    Animal produce();
}
public static void main(String[] args) {
        FactoryNormal fn = new DogFactory();
        Animal animal = fn.produce();
        animal.run();
   }