Dinesh on Java

ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
Triangle triangle = (Triangle) context.getBean("triangle");
triangle.draw();

ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
Circle circle= (Circle) context.getBean("circle");
circle.draw();

ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
Shape shape = (Shape) context.getBean("shape");
shape.draw();

Lets see the full running example about the Coding to interface.

Shape.java

package com.dineshonjava.sdnext.interfaceCoding.tutorial;

public interface Shape
{
   void draw();
}

Triangle.java

package com.dineshonjava.sdnext.interfaceCoding.tutorial;

public class Triangle implements Shape
{
 private Point pointA;
 private Point pointB;
 private Point pointC;
 
 /**
  * @param pointA the pointA to set
  */
 public void setPointA(Point pointA) {
  this.pointA = pointA;
 }

 /**
  * @param pointB the pointB to set
  */
 public void setPointB(Point pointB) {
  this.pointB = pointB;
 }

 /**
  * @param pointC the pointC to set
  */
 public void setPointC(Point pointC) {
  this.pointC = pointC;
 }

 public void draw()
 {
System.out.println("Drawing Triangle");
System.out.println("PointA is ("+pointA.getX()+", "+pointA.getY()+")");
System.out.println("PointB is ("+pointB.getX()+", "+pointB.getY()+")");
System.out.println("PointC is ("+pointC.getX()+", "+pointC.getY()+")");
 }
}

Circle.java

package com.dineshonjava.sdnext.interfaceCoding.tutorial;

public class Circle implements Shape
{
 private Point center;

 /**
  * @param center the center to set
  */
 public void setCenter(Point center) 
 {
  this.center = center;
 }

 @Override
 public void draw() 
 {
System.out.println("Circle is drawn of center ("+center.getX()+", "+center.getY()+")");
 }
}

Point.java

package com.dineshonjava.sdnext.interfaceCoding.tutorial;

public class Point
{
 private int x;
 private int y;
 /**
  * @return the x
  */
 public int getX() {
  return x;
 }
 /**
  * @param x the x to set
  */
 public void setX(int x) {
  this.x = x;
 }
 /**
  * @return the y
  */
 public int getY() {
  return y;
 }
 /**
  * @param y the y to set
  */
 public void setY(int y) {
  this.y = y;
 }
}

Spring.xml

<beans xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p" xmlns:>
If every thing is OK then run the following Drawing Application draw a shape using draw() method of shape interface.

 DrawingApp.java
package com.dineshonjava.sdnext.interfaceCoding.tutorial;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @author Dinesh
 *
 */
public class DrawingApp {

 /**
  * @param args
  */
 public static void main(String[] args)
 {
ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
Shape shape = (Shape) context.getBean("triangle");
shape.draw();
 }
}

Its draw a triangle.

Output:
Jul 8, 2012 7:02:58 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@ab50cd: startup date [Sun Jul 08 19:02:57 IST 2012]; root of context hierarchy
Jul 8, 2012 7:02:58 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [spring.xml]
Jul 8, 2012 7:02:59 PM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@14c1103: defining beans [triangle,circle,pointA,pointB,pointC,center]; root of factory hierarchy
Drawing Triangle

PointA is (0, 0)

PointB is (-20, 0)

PointC is (20, 0)



 If we want draw a circle the execute the following Drawing Application.


 DrawingApp.java
package com.dineshonjava.sdnext.interfaceCoding.tutorial;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @author Dinesh
 *
 */
public class DrawingApp {

 /**
  * @param args
  */
 public static void main(String[] args)
 {
ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
Shape shape = (Shape) context.getBean("circle");
shape.draw();
 }
}



 Its draw a circle.

Output:
Jul 8, 2012 7:05:11 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@ab50cd: startup date [Sun Jul 08 19:05:11 IST 2012]; root of context hierarchy
Jul 8, 2012 7:05:11 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [spring.xml]
Jul 8, 2012 7:05:11 PM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@14c1103: defining beans [triangle,circle,pointA,pointB,pointC,center]; root of factory hierarchy
Circle is drawn of center (10, 10)