Java 深入探究讲解简单工厂模式

public interface Product {
    public void show();
}
​

public class ConcreteProduct1 implements Product {
    @Override
    public void show() {
        System.out.println("具体产品1展示...");
    }
}
​
​

public class ConcreteProduct2 implements Product {
    @Override
    public void show() {
        System.out.println("具体产品2展示...");
    }
}
​

public class SimpleFactory {
    //提供一个方法，基于不同的参数获取不同的实例对象
    public static Product getConcreteProduct(int productType) {
        switch (productType) {
            case Const.Product1:
                return new ConcreteProduct1();
            case Const.Product2:
                return new ConcreteProduct2();
            case Const.Product3:
                return new ConcreteProduct3();
        }
        return null;
    }
​
​
    final class Const {
        static final int Product1 = 1;//表示是ConcreteProduct1产品
        static final int Product2 = 2;//表示是ConcreteProduct2产品
        static final int Product3 = 3;//表示是ConcreteProduct3产品
    }
    

        //获取产品1
        Product product = SimpleFactory.getConcreteProduct(Const.Product1);
        product.show();
        //获取产品2
        Product product1 = SimpleFactory.getConcreteProduct(Const.Product2);
        product1.show();