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In this example, we use
map it is an answer with a published username. Here, we use both keys and values as strings.
Like the previous example, it is a forum example, where
A question can have multiple answers.
Question.java
This class contains three properties, two constructors, and the displayInfo() method used to display information.
package com.w3codebox;
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;
public Question() {}
public Question(int id, String name, Map<String, String> answers) {
super();
this.id = id;
this.name = name;
this.answers = answers;
}
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
map of
entry Properties used to define 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.w3codebox.Question">
<constructor-arg value="11></constructor-arg>
<constructor-arg value="What is Java?">/constructor-arg>
<constructor-arg>
<map>
<entry key="Java is a Programming Language" value="Ajay Kumar"></entry>
<entry key="Java is a Platform" value="John Smith"></entry>
<entry key="Java is an Island" value="Raj Kumar"></entry>
</map>
</constructor-arg>
</bean>
</beans>
Test.java
This class retrieves a Bean from the applicationContext.xml file and calls the displayInfo() method.
package com.w3codebox;
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();
}
}