Spring Framework - 8 - Collection tags

Supported collections are:

1. <list>
2. <set>
3. <map>

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1. <list>

• DrawingApp class remains the same, however refering to the Triangle Collection bean this time as below.

public class DrawingApp {

public static void main(String[] args) {

ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");

TriangleCollection triangleCollection = (TriangleCollection)      context.getBean("triangleCollection");

triangleCollection.Draw();

}

}

• New Triangle class, TriangleCollection modified for accepting List for Point objects as shown below

public class TriangleCollection {

private List<Point> pointsList;

public List<Point> getPointsList() {

return pointsList;

}

public void setPointsList(List<Point> pointsList) {

this.pointsList = pointsList;

}

public void Draw()

{

for(Point point: pointsList)

{

System.out.println("Point: (" + point.getX() + "," + point.getY()+")");

}

}

}

• The spring.xml would be modified as below. The<ref> tags are used within <list> tags with the bean attribute to initiate the Point objects form within the "triangleCollection" bean.

<beans>
        <bean id="triangleCollection" class="com.product.springDemo.TriangleCollection">
<property name="pointsList">
<list>
<ref bean ="Bean-pointB"/>
<ref bean ="Bean-pointC"/>
</list>
</property>
</bean>
<bean id="Bean-pointB" class="com.product.springDemo.Point">
<property name="x" value="20"/>
<property name="y" value="200"/>
</bean>
<bean id="Bean-pointC" class="com.product.springDemo.Point">
<property name="x" value="30"/>
<property name="y" value="300"/>
</bean>

        </beans>

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2. <set>

• DrawingApp class remains the same as above

• New Triangle class, TriangleCollection modified for accepting Set for Point objects as shown below

public class TriangleCollection {

private Set<Point> pointsList;

public Set<Point> getPointsList() {

return pointsList;

}

public void setPointsList(Set<Point> pointsList) {

this.pointsList = pointsList;

}

public void Draw()

{

for(Point point: pointsList)

{

System.out.println("Point: (" + point.getX() + "," + point.getY()+")");

}

}

}

• The spring.xml would be modified as below. The<ref> tags are used within <set> tags with the bean attribute to initiate the Point objects form within the "triangleCollection" bean.

<beans>
        <bean id="triangleCollection" class="com.product.springDemo.TriangleCollection">
<property name="pointsList">
<set>
<ref bean ="Bean-pointB"/>
<ref bean ="Bean-pointC"/>
</set>
</property>
</bean>
<bean id="Bean-pointB" class="com.product.springDemo.Point">
<property name="x" value="20"/>
<property name="y" value="200"/>
</bean>
<bean id="Bean-pointC" class="com.product.springDemo.Point">
<property name="x" value="30"/>
<property name="y" value="300"/>
</bean>
        </beans>