What is the difference between spring factory-method and factory-bean?

Question

I am new Springs. In Bean tag I found factory-method and factory-bean Attributes. What is the difference between factory-method and factory-bean?

I am using factory-method to call my getInstance static method to create singleton object.

What is factory-bean used for?

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For given replies, What I understood was

Factory-method is used for calling a static method to create object in same bean class.

Factory-bean is used for creating a object based on factory design pattern.

Ex:- I am asking a EggPlant object from VegetableFactory (Which will return vegetable object which was asked)class by passing my vegetable name(EggPlant in this case).

Please correct if I am wrong?

Answer 1

factory-method: represents the factory method that will be invoked to inject the bean. factory-bean: represents the reference of the bean by which factory method will be invoked. It is used if factory method is non-static. 

Printable.java

package com.javatpoint;   public interface Printable {       void print();   }   

A.java

package com.javatpoint;   public class A implements Printable{       @Override       public void print() {           System.out.println("hello a");       }       }  

B.java

package com.javatpoint;   public class B implements Printable{       @Override       public void print() {           System.out.println("hello b");       }   }   

PrintableFactory.java

package com.javatpoint;   public class PrintableFactory {       //non-static factory method       public Printable getPrintable(){           return new A();//return any one instance, either A or B       }   }   

applicationContext.xml

<?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="pfactory" class="com.javatpoint.PrintableFactory"></bean>   <bean id="p" class="com.javatpoint.Printable" factory-method="getPrintable"    factory-bean="pfactory"></bean>    </beans>   

Notice that public Printable getPrintable() of PrintableFactory.java is a non-static method. Generally if we want access/call method or other resources of the a class we have to create it's instance. Similarly in that we created it bean. using bean's reference variable pfactory we are calling the factory method getPrintable.