在春季自动布线（属性名称和Bean名称必须相同）

Question

public class B {

    public B(){
        System.out.println("B is created");
    }

    public void print(){
        System.out.println("hello b");
    }

}

class B.java

public class A {

    B c;
    public A(){

        System.out.println("a is created");
    }

    public B getB(){
        return c;
    }

    public void setB(B c){
    this.c =c;
    }

    void print(){
        System.out.println("hello a");
    }

    void display(){
        print();

        c.print();
    }
}

class A.java

<?xml version="1.0" encoding="UTF-8"?>  
<beans  
    xmlns="http://www.springframework.org/schema/beans"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
    xmlns:p="http://www.springframework.org/schema/p"  
    xsi:schemaLocation="http://www.springframework.org/schema/beans   
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> 
<bean id="b" class="B"></bean>

<bean id="a" class="A" autowire="byName"></bean>

</beans>

applicationcontext.xml

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationcontext.xml");

        A a1 = context.getBean("a",A.class);
        a1.display();

    }
}

Test .java

i was going through the tutorials on autowiring in spring by using "byName" mode. and it says- The byName mode injects the object dependency according to name of the bean. In such case, property name and bean name must be same. It internally calls setter method.

but in this application the property name and the bean name both are different but it still works fine,so how this autowiring is working even though the both names are different?

Answer 1

It says property name , not field name .

Property name in this case is inferred from the setter method name as defined by the JavaBeans naming convention ( setB -> b ), thus property name and bean name are the same.