---
title: "What are the different types of dependency injection. Explain with examples."  
description: "What are the different types of dependency injection. Explain with examples."  
author: "James Smith"  
published: 2011-07-23  
updated: 2020-09-20  
canonical: https://www.mindstick.com/interview/1109/what-are-the-different-types-of-dependency-injection-explain-with-examples  
category: "java"  
tags: ["java"]  
reading_time: 3 minutes  

---

# What are the different types of dependency injection. Explain with examples.

There are two types of dependency injection: setter injection and constructor injection.\

**Setter Injection:** Normally in all the java beans, we will use setter and getter method to set and get the value of property as follows: \

public class namebean { \
String name; \
public void setName(String a) { \
name = a; } \
public String getName() { \
return name; } \
} \
We will create an instance of the bean 'namebean' (say bean1) and set property as bean1.setName("tom"); Here in setter injection, we will set the property 'name' in spring configuration file as showm below:\
<bean id="bean1" class="namebean"> \
<property name="name" > \
<value>tom</value> \
</property> \
</bean> \
The subelement <value> sets the 'name' property by calling the set method as setName("tom"); This process is called setter injection. \
To set properties that reference other beans <ref>, subelement of <property> is used as shown below, \
<bean id="bean1" class="bean1impl"> \
<property name="game"> \
<ref bean="bean2"/> \
</property> \
</bean> \
<bean id="bean2" class="bean2impl" />\

**Constructor injection:** For constructor injection, we use constructor with parameters as shown below, \

public class namebean { \
String name; \
public namebean(String a) { \
name = a; \
} \
} \
We will set the property 'name' while creating an instance of the bean 'namebean' as namebean bean1 = new namebean("tom"); \
Here we use the <constructor-arg> element to set the the property by constructor injection as \
<bean id="bean1" class="namebean"> \
<constructor-arg> \
<value>My Bean Value</value> \
</constructor-arg> \
</bean>\

## Answers

### Answer by James Smith

There are two types of dependency injection: setter injection and constructor injection.\

**Setter Injection:** Normally in all the java beans, we will use setter and getter method to set and get the value of property as follows: \

public class namebean { \
String name; \
public void setName(String a) { \
name = a; } \
public String getName() { \
return name; } \
} \
We will create an instance of the bean 'namebean' (say bean1) and set property as bean1.setName("tom"); Here in setter injection, we will set the property 'name' in spring configuration file as showm below:\
<bean id="bean1" class="namebean"> \
<property name="name" > \
<value>tom</value> \
</property> \
</bean> \
The subelement <value> sets the 'name' property by calling the set method as setName("tom"); This process is called setter injection. \
To set properties that reference other beans <ref>, subelement of <property> is used as shown below, \
<bean id="bean1" class="bean1impl"> \
<property name="game"> \
<ref bean="bean2"/> \
</property> \
</bean> \
<bean id="bean2" class="bean2impl" />\

**Constructor injection:** For constructor injection, we use constructor with parameters as shown below, \

public class namebean { \
String name; \
public namebean(String a) { \
name = a; \
} \
} \
We will set the property 'name' while creating an instance of the bean 'namebean' as namebean bean1 = new namebean("tom"); \
Here we use the <constructor-arg> element to set the the property by constructor injection as \
<bean id="bean1" class="namebean"> \
<constructor-arg> \
<value>My Bean Value</value> \
</constructor-arg> \
</bean>\


---

Original Source: https://www.mindstick.com/interview/1109/what-are-the-different-types-of-dependency-injection-explain-with-examples

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