Spring Constructor Injection Example

In Spring Framework the constructor injection is also a type of Dependency injection (like Setter Injection).  An Example of Constructor Injection is given below

StudentBean.java

package net.roseindia;

public class StudentBean {
	private String name;
	private int rollNo;
	private String course;

	public StudentBean(int rollNo, String name, String course) {
		this.rollNo = rollNo;
		this.name = name;
		this.course = course;		
	}

	@Override
	public String toString() {
		// TODO Auto-generated method stub
		return "Roll No- " + rollNo + "\nName- " + name + "\nCourse- " + course
				+ "\n";

	}
}

bean.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="student" class="net.roseindia.StudentBean">
<constructor-arg index="0" type="int" value="001" />
<constructor-arg index="1" type="java.lang.String"
value="John" />
<constructor-arg index="2" type="java.lang.String"
value="B.Tech" />
</bean>
</beans>

MainClaz.java

package net.roseindia;

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

public class MainClaz {
	public static void main(String[] args) {
		ApplicationContext context = new ClassPathXmlApplicationContext(
				"bean.xml");
		StudentBean studentBean = (StudentBean) context.getBean("student");
		System.out.println(studentBean);
	}
}

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