java简单工厂模式

package com.kongjs.design_pattern.factory_pattern.simple_factory_pattern;

/**
 * 2021 一月 星期一 20 ：17
 * Administrator 
 **/
public class AppFactory {
    /*
    * 简单工厂模式
    * */
    public static <T extends App> T createApp(Class<T> c) {
        App app = null;
        try {
            app = (App)Class.forName(c.getName()).newInstance();
        } catch (IllegalAccessException | ClassNotFoundException | InstantiationException e) {
            // 权限访问异常
            e.printStackTrace();
        }
        return (T)app;
    }
}

public class Main {
    public static void main(String[] args) {
        App app = createApp(AppImpl.class);
        app.say();
    }
}

@FunctionalInterface
public interface App {
    void say();
}

public class AppImpl implements App {
    @Override
    public void say() {
        System.out.println("产品");
    }
}