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Setter Injection with Map Example

Setter Injection with Map Example

In this example, we are using map as the answer for a question that have answer as the key and username as the value. Here, we are using key and value pair both as a string.

Like previous examples, it is the example of forum where one question can have multiple answers.

Question.java

This class contains three properties, getters & setters and displayInfo() method to display the information.

package com.w3cschoool;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;

public class Question {
private int id;
private String name;
private Map<String,String> answers;

//getters and setters

public void displayInfo(){
	System.out.println("question id:"+id);
	System.out.println("question name:"+name);
	System.out.println("Answers....");
	Set<Entry<String, String>> set=answers.entrySet();
	Iterator<Entry<String, String>> itr=set.iterator();
	while(itr.hasNext()){
		Entry<String,String> entry=itr.next();
		System.out.println("Answer:"+entry.getKey()+" Posted By:"+entry.getValue());
	}
}
}

applicationContext.xml

The entry attribute of map is used to define the key and value information.

<?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="q" class="com.w3cschoool.Question">
<property name="id" value="1"></property>
<property name="name" value="What is Java?"></property>
<property name="answers">
<map>
<entry key="Java is a programming language"  value="Sonoo Jaiswal"></entry>
<entry key="Java is a Platform" value="Sachin Yadav"></entry>
</map>
</property>
</bean>

</beans>

Test.java

This class gets the bean from the applicationContext.xml file and calls the displayInfo() method.

package com.w3cschoool;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;

public class Test {
public static void main(String[] args) {
	Resource r=new ClassPathResource("applicationContext.xml");
	BeanFactory factory=new XmlBeanFactory(r);
	
	Question q=(Question)factory.getBean("q");
	q.displayInfo();
	
}
}

download this example (developed using MyEclipse IDE)

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