Spring框架中<bean>第一种补充

public static void learnCourse(){
        student student=new student();
            student.learnJava();
            student.learnHtml();
    }
    public static void main(String[] args){
        learnCourse();
        
}

public void learnJava(){
        Icourse course=new JavaIcourse();
        course.learn();
    }
    
    public void learnHtml(){
        Icourse course=new HtmlIcourse();
        course.learn();
    }

Icourse：
        public interface Icourse {
    void learn();
}
JavaIcourse：
        public class JavaIcourse implements Icourse{
    public void learn(){
        System.out.println("学习java");
    }

}
HtmlIcourse:
        public class HtmlIcourse implements Icourse{
    public void learn(){
        System.out.println("学习html");
    }

}

public static void learnCourse(){
        student student=new student();
        student.learn("java");
    }
    public static void main(String[] args){
        learnCourse();
    }

public void learn(String name){
        Icourse course=factory.getCourse(name);
        course.learn();
    }

public class factory {
    //根据名字获取课程的方法
    public static Icourse getCourse(String name){
        if(name.equals("java")){
            return new JavaIcourse();
        }
        else
            return new HtmlIcourse();
    }
}

<bean id="JavaIcourse" class="org_shitang_instance.JavaIcourse"></bean>
    <bean id="HtmlIcourse" class="org_shitang_instance.HtmlIcourse"></bean>

public void learn(String name){
        ApplicationContext conext=new ClassPathXmlApplicationContext("applicationContext.xml");
        Icourse course=(Icourse)conext.getBean(name);
        course.learn();
    }

public static void main(String[] args){
        ApplicationContext conext=new ClassPathXmlApplicationContext("applicationContext.xml");
        student student=(student)conext.getBean("student");
        student.learn("Html");
    }