Java 静态工厂Demo

秒速五厘米 2021-11-02 03:20 261阅读 0赞

接口Car.java

/*
     * package factory;
     */
    public interface Car {
        public abstract void start();
    }

实现类Pickup.java

/*
     * package factory;
     */
    public class Pickup implements Car {
        public void start() {
            System.out.println("Pickup start!");
        }
        
    }

实现类Mini.java

/*
     * package factory;
     */
    public class Mini implements Car {
        @Override
        public void start() {
            System.out.println("Mini Car start!");
        }
    }

工厂类CarFactory.java

/*
     * package factory;
     */
    public class CarFactory {
        private static Car car = null;
        public static Car getCar(String type) {
            if ("Pickup".equalsIgnoreCase(type)) {
                car = new Pickup();
            }
            if ("Mini".equalsIgnoreCase(type)) {
                car = new Mini();
            }
            return car;
        }
    }

属性文件cars.properties

Mini = factory.Mini
    Pickup = factory.Pickup

使用属性文件的工厂类CarFactoryWithProperties.java

/*
     * package factory;
     */
    public class CarFactoryWithProperties {
        private static Car car = null;
        public static Properties properties = new Properties();
        public static Car getCar(String type) throws IOException, InstantiationException, ClassNotFoundException, IllegalAccessException {
            InputStream inStream = null;
            inStream = new FileInputStream("src/factory/cars.properties");
            properties.load(inStream);
            String carClass = properties.getProperty(type);
            car = (Car) Class.forName(carClass).newInstance();
            return car;
        }
    }

测试类Test.java

/*
     * package factory;
     */
    public class Test {
        public static void main(String[] args) throws IOException, InstantiationException, ClassNotFoundException, IllegalAccessException {
            CarFactory.getCar("mini").start();
            CarFactory.getCar("Pickup").start();
            System.out.println("-----------------------------");
            CarFactoryWithProperties.getCar("Mini").start();
            //CarFactoryWithProperties.getCar("mini").start();
        }
    }

运行结果：

run:
    Mini Car start!
    Pickup start!
    -----------------------------
    Mini Car start!
    成功构建 (总时间: 0 秒)

转载于:https://www.cnblogs.com/Leo-Forest/archive/2012/10/26/2741087.html