In spring you can inherit the bean definition using keyword
“parent”
<bean id="parentTriangle"
class="org.yash.watertechsol.Triangle">
<property name="pointA"
ref="pointA"></property>
</bean>
<bean id="triangle"
class="org.yash.watertechsol.Triangle" parent="parentTriangle">
<property name="pointB"
ref="pointB"></property>
<property name="pointC"
ref="pointC"></property>
</bean>
If you don’t want to initialize your parent class just want
to use as template, then you have property class “abstract=true”, in this case
spring do not create beam for that id it can be only used as template. Child
beans have to inherit this bean.
<bean id="parentTriangle"
class="org.yash.watertechsol.Triangle" abstract="true">
<property name="pointA"
ref="pointA"></property>
</bean>
You can also add list or collection classes in bean
configuration.
<bean id="parentTriangle"
class="org.yash.watertechsol.Triangle" abstract="true">
<property name="points">
<list>
<ref bean="pointA" />
</list>
</property>
</bean>
You can merge parent list in child bean list. If you
won’t merge then parent list over written by child bean.
<bean id="parentTriangle"
class="org.yash.watertechsol.Triangle" abstract="true">
<property name="points">
<list>
<ref bean="pointA" />
</list>
</property>
</bean>
<bean id="triangle"
class="org.yash.watertechsol.Triangle" parent="parentTriangle">
<property name="points">
<list merge="true">
<ref bean="pointB"
/>
</list>
</property>
</bean>
Drawing.java
package org.yash.watertechsol;
import org.springframework.context.ApplicationContext;
import
org.springframework.context.support.ClassPathXmlApplicationContext;
public class DrawingApp {
public
static void main(String[] args){
ApplicationContext
context = new ClassPathXmlApplicationContext("spring.xml");
Triangle
triangle = (Triangle)context.getBean("triangle");
triangle.draw();
}
}
Point.java
package org.yash.watertechsol;
public class Point {
private int x;
private int y;
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
public int getY() {
return y;
}
public void setY(int y) {
this.y = y;
}
}
Triangle.java
package org.yash.watertechsol;
import java.util.List;
public class Triangle {
private
List<Point> points;
public void draw(){
for(Point point:points){
System.out.println(point.getX()
+",
"+point.getY());
}
}
public void
setPoints(List<Point> points) {
this.points = points;
}
public
List<Point> getPoints() {
return points;
}
}
spring.xml
<?xml
version="1.0" encoding="UTF-8"?>
<!DOCTYPE
beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
<bean id="parentTriangle"
class="org.yash.watertechsol.Triangle" abstract="true">
<property name="points">
<list>
<ref bean="pointA"
/>
</list>
</property>
</bean>
<bean id="triangle"
class="org.yash.watertechsol.Triangle" parent="parentTriangle">
<property name="points">
<list merge="true">
<ref bean="pointB"
/>
</list>
</property>
</bean>
<bean id
="pointA"
class="org.yash.watertechsol.Point">
<property name="x"
value="0" />
<property name="y"
value="0" />
</bean>
<bean id
="pointB"
class="org.yash.watertechsol.Point">
<property name="x"
value="-20" />
<property name="y"
value="0" />
</bean>
<bean id
="pointC"
class="org.yash.watertechsol.Point">
<property name="x"
value="0" />
<property name="y"
value="20" />
</bean>
</beans>
*********************************************
Triangle.java
package org.yash.watertechsol;
public class Triangle {
private Point pointA;
private Point pointB;
private Point pointC;
public Point
getPointA() {
return pointA;
}
public void setPointA(Point
pointA) {
this.pointA = pointA;
}
public Point
getPointB() {
return pointB;
}
public void setPointB(Point
pointB) {
this.pointB = pointB;
}
public Point
getPointC() {
return pointC;
}
public void setPointC(Point
pointC) {
this.pointC = pointC;
}
public void draw(){
System.out.println("Point A
= (" + getPointA().getX()+", "+getPointA().getY()+")");
System.out.println("Point B
= (" + getPointB().getX()+", "+getPointB().getY()+")");
System.out.println("Point C
= (" + getPointC().getX()+", "+getPointC().getY()+")");
}
}
spring.xml
<?xml
version="1.0" encoding="UTF-8"?>
<!DOCTYPE
beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
<bean id="parentTriangle"
class="org.yash.watertechsol.Triangle">
<property name="pointA"
ref="pointA"></property>
</bean>
<bean id="triangle"
class="org.yash.watertechsol.Triangle" parent="parentTriangle">
<property name="pointB"
ref="pointB"></property>
<property name="pointC"
ref="pointC"></property>
</bean>
<bean id
="pointA"
class="org.yash.watertechsol.Point">
<property name="x"
value="0" />
<property name="y"
value="0" />
</bean>
<bean id
="pointB"
class="org.yash.watertechsol.Point">
<property name="x"
value="-20" />
<property name="y"
value="0" />
</bean>
<bean id
="pointC"
class="org.yash.watertechsol.Point">
<property name="x"
value="0" />
<property name="y"
value="20" />
</bean>
</beans>
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