BE THE CODER > Spring > Core Examples

Spring Inversion of Control (IoC) also known as Dependency Injection (DI) is a process by which objects define their dependencies with collaborating objects. Singleton scoped bean permits a single bean definition to a single object instance per Spring IoC container. It is the default scope of Spring IoC container.

File Name :

/SpringCore001/conf/scope/singleton.xml

File Name :

com/bethecoder/tutorials/spring3/basic/SimpleBean.java


package com.bethecoder.tutorials.spring3.basic;



public class SimpleBean {



  private String simpleProp;



  public String getSimpleProp() {

    return simpleProp;

  }



  public void setSimpleProp(String simpleProp) {

    this.simpleProp = simpleProp;

  }

  

}

File Name :	com/bethecoder/tutorials/spring3/tests/scope/SingletonTests.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.spring3.tests.scope;



import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;



import com.bethecoder.tutorials.spring3.basic.SimpleBean;



public class SingletonTests {



  /**

   * @param args

   */

  public static void main(String[] args) {

    

    System.out.println("Initializing ApplicationContext");

    ApplicationContext factory = new ClassPathXmlApplicationContext("singleton.xml");

    System.out.println("ApplicationContext Initialized");

    

    System.out.println("Accessing first bean");

    SimpleBean first = (SimpleBean) factory.getBean("first");

    System.out.println(first);



    first = (SimpleBean) factory.getBean("first");

    System.out.println(first);



    System.out.println("Accessing second bean");

    SimpleBean second = (SimpleBean) factory.getBean("second");

    System.out.println(second);



    second = (SimpleBean) factory.getBean("second");

    System.out.println(second);

  }



}

Singleton Scope