第二章《设计模式－工厂模式》

原创

聊聊IT那些事 2021-07-29 10:01:06 博主文章分类：设计模式 ©著作权

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1.工厂接口

package test.my.maven.FactoryModel;

public interface Person {
    void eat();
    void water();
}

2. 工厂实现　

package test.my.maven.FactoryModel;

public class Boy implements Person {
    @Override
    public void eat() {
        System.out.println("Boy eat!!!");
    }

    @Override
    public void water() {
        System.out.println("Boy water!!!");
    }
}

package test.my.maven.FactoryModel;

public class Girl implements Person {
    @Override
    public void eat() {
        System.out.println("Girl eat!!!");
    }

    @Override
    public void water() {
        System.out.println("Girl water!!!");
    }
}

３．工厂类实例获取

package test.my.maven.FactoryModel;

public class PersonFactory {
    public static Object getInstance(Class<? extends Person> clazz){
        try {
            return Class.forName(clazz.getName()).newInstance();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }
}

４．测试

package test.my.maven.FactoryModel;

public class TestMain {
    public static void main(String[] args) {
        Person boy = (Person) PersonFactory.getInstance(Boy.class);
        if(null != boy) {
            boy.eat();
            boy.water();
        }
        Person girl = (Person) PersonFactory.getInstance(Girl.class);
        if(null != girl) {
            girl.eat();
            girl.water();
        }
    }
}