Android中遇到的简单工厂模式的几种实现

废话一大堆：工厂模式有简单工厂模式，工厂方法模式抽象工厂模式这三种工厂模式各自有各自的应用场景，根据需要灵活选择。

简单工厂模式实现1：

定义一个School接口

public interface School {        StudentOne getStundent();}

定义接口实现类

public class SchoolImpl implements School {    @Override    public StudentOne getStundent() {        StudentOne studentOne  =new StudentOne("小明","三班");        return studentOne;    }}

Demo

      School schoolInterface = new SchoolImpl();        schoolInterface.getStundent();

2.根据参数生产不通的实现

定义接口实现类Two

public class SchoolImpl_Two implements School {    @Override    public StudentOne getStundent() {        StudentOne studentOne = new StudentOne("小兰","四班");        return studentOne;    }}

定义一个工厂类传入需要的参数

public class ParameterFactory {    public static School getStudent(int parameter){        switch (parameter){            case 1 :                 School school = new SchoolImpl();                return school;            case 2:                return  new SchoolImpl_Two();        }        return  null;    }}

Demo:

        School school1 = ParameterFactory.getStudent(2);        school1.getStundent();

3.根据配置文件产生不同的实现

添加配置文件config.properties

create_a=com.example.moveso.factory.impl.SchoolImplcreate_b=com.example.moveso.factory.impl.SchoolImpl_Two

定义配置文件读取类

public class PropertiesFactory {    public static School whoAtSchool(Context context, String key) {        Properties properties = new Properties();        try {            InputStream inputStream = context.getAssets().open("config.properties");            //如果放入了app/src/mian/res/raw文件中//        InputStream inputStream1 =      context.getResources().openRawResource("config.properties");       //java寫法//        InputStream inputStream2 = PropertieaFactory.class.getResourceAsStream("assets/config.properties");            properties.load(inputStream);            Class clazz = Class.forName(properties.getProperty(key));            return (School) clazz.newInstance();        } catch (Exception e) {            e.printStackTrace();        }        return null;    }}

demo实现：

 School school = PropertiesFactory.whoAtSchool(this,"create_a");        school.getStundent();        School school2 = PropertiesFactory.whoAtSchool(this,"create_b");        school2.getStundent();

代买写的比较乱以后会改进，根据需求3种方式实现的简单工厂模式

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