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    Dependency Injection

    The basic principle behind Dependency Injection (DI) is that objects define their dependencies . Then, it is the job of the container to actually inject those dependencies when it creates the bean.
    The basic concept of the Inversion of Control pattern (also known as Dependency Injection (DI) ) is that you do not create your objects but describe how they should be created. You don't directly connect your components and services together in code but describe which services are needed by which components in a configuration file. A container (in the case of the Spring framework, the IOC container) is then responsible for hooking it all up. In a typical IOC scenario, the container creates all the objects, wires them together by setting the necessary properties, and determines when methods will be invoked.

    The two major flavors of Dependency Injection are Setter Injection (injection via JavaBean setters) and Constructor Injection (injection via constructor arguments).

    Setter Injection:


    Find below an example of a class that can only be dependency injected using pure setter injection.
    XML configuration for setter Dependency Injection is below
    <bean id="empBean" class="com.techfaq.EmpBean">
    <!-- setter injection using the nested <ref/> element -->
    <property name="addressBean"><ref bean="addressBean"/></property>
    </bean>
    <bean id="addressBean" class="com.techfaq.AddressBean"/>

    The Java Code is (EmpBean.java)
    package com.techfaq;
    public class EmpBean {
    private AddressBean addressBean;
    public void setAddressBean(AddressBean addressBean) {
    this.addressBean = addressBean;
    }
    public AddressBean getAddressBean() {
    return addressBean;
    }
    }

    The Java Code is (AddressBean.java)
    package com.techfaq;
    public class AddressBean {
    private int id;
    public void setId(int id) {
    this.id = id;
    }
    public int getId() {
    return id;
    }
    }

    Constructor Injection:


    Find below an example of a class that can only be dependency injected using pure Constructor injection.
    XML configuration for Constructor Dependency Injection is below
    <bean id="empBean" class="com.techfaq.EmpBean">
    <!-- setter injection using the nested <ref/> element -->
    <constructor-arg><ref bean="addressBean"/></constructor-arg>
    <!--OR you can use <constructor-arg ref="yetAnotherBean"/>-->
    </bean>
    <bean id="addressBean" class="com.techfaq.AddressBean"/>

    The Java Code is (EmpBean.java)
    package com.techfaq;
    public class EmpBean {
    private AddressBean addressBean;
    public EmpBean(AddressBean addressBean) {
    this.addressBean = addressBean;
    }
    public AddressBean getAddressBean() {
    return addressBean;
    }
    }

    The Java Code is (AddressBean.java)
    package com.techfaq;
    public class AddressBean {
    private int id;
    public void setId(int id) {
    this.id = id;
    }
    public int getId() {
    return id;
    }
    }

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