Source Code : Bean Injection Collection: Map

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Bean Injection Collection: Map

       
File: context.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"
       xsi:schemaLocation="
                http://www.springframework.org/schema/beans
                http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="collectionsDemo" class="CollectionsDemo">
        <property name="map">
            <map>
                <entry key="someValue">
                    <value>Hello World!</value>
                </entry>
                <entry key="someBean">
                    <ref local="oracle"/>
                </entry>
            </map>
        </property>
        <property name="props">
            <props>
                <prop key="firstName">
                    Jan
                </prop>
                <prop key="secondName">
                    Machacek
                </prop>
            </props>
        </property>
        <property name="set">
            <set>
                <value>Hello World!</value>
                <ref local="oracle"/>
            </set>
        </property>
        <property name="list">
            <list>
                <value>Hello World!</value>
                <ref local="oracle"/>
            </list>
        </property>
    </bean>

    <bean id="oracle" class="BookwormOracle"/>

</beans>


File: Main.java

import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

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

public class Main {

  public static void main(String[] args) {
    BeanFactory factory = new XmlBeanFactory(new ClassPathResource("context.xml"));
    CollectionsDemo instance = (CollectionsDemo) factory.getBean("collectionsDemo");
    instance.displayInfo();
  }
}

interface Encyclopedia {
  Long findLong(String entry);
}

interface Oracle {
  String defineMeaningOfLife();
}

class BookwormOracle implements Oracle {
  private Encyclopedia encyclopedia;

  public String defineMeaningOfLife() {
    Long ageOfUniverse = this.encyclopedia.findLong("AgeOfUniverse");
    Long constantOfLife = this.encyclopedia.findLong("ConstantOfLife");
    return String.valueOf(ageOfUniverse / constantOfLife);
  }

  public void setEncyclopedia(Encyclopedia encyclopedia) {
    this.encyclopedia = encyclopedia;
  }
}

class CollectionsDemo {
  private Map map;

  private Properties props;

  private Set set;

  private List list;

  public void setList(List list) {
    this.list = list;
  }

  public void setSet(Set set) {
    this.set = set;
  }

  public void setMap(Map map) {
    this.map = map;
  }

  public void setProps(Properties props) {
    this.props = props;
  }

  public void displayInfo() {

    // display the Map
    Iterator i = map.keySet().iterator();

    System.out.println("Map contents:
");
    while (i.hasNext()) {
      Object key = i.next();
      System.out.println("Key: " + key + " - Value: " + map.get(key));
    }

    // display the properties
    i = props.keySet().iterator();
    System.out.println("
Properties contents:
");
    while (i.hasNext()) {
      String key = i.next().toString();
      System.out.println("Key: " + key + " - Value: " + props.getProperty(key));
    }

    // display the set
    i = set.iterator();
    System.out.println("
Set contents:
");
    while (i.hasNext()) {
      System.out.println("Value: " + i.next());
    }

    // display the list
    i = list.iterator();
    System.out.println("
List contents:
");
    while (i.hasNext()) {
      System.out.println("Value: " + i.next());
    }
  }

}




           
       

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