How to configure Spring Application using java based configuration

How to configure Spring Application using java based configuration 

Spring Application Require a Config class to define the bean definition .

The config class annotated with @Configuration annotation and @Bean annotation used for bean describe bean definition.

AnnotationConfigApplicationContext  class an implementation of ApplicationContext is used to 

initialization of  Spring application config using spring configuration class 

SpringConfig .java

package in.jk.javaconfig;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

@Configuration

public class SpringConfig {

@Bean(name = "user")

public User getUser() {

return new User();

}

}

User .java

package in.jk.javaconfig;

public class User {

private int userId;

private String userName;

private String password;

private String email;

public int getUserId() {

return userId;

}

public void setUserId(int userId) {

this.userId = userId;

}

public String getUserName() {

return userName;

}

public void setUserName(String userName) {

this.userName = userName;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public String getEmail() {

return email;

}

public void setEmail(String email) {

this.email = email;

}

@Override

public String toString() {

return "User [userId=" + userId + ", userName=" + userName + ", password=" + password + ", email=" + email

+ "]";

}

}

SpringApplication .java

package in.jk.javaconfig;

import org.springframework.context.ApplicationContext;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class SpringApplication {

public static void main(String[] args) {

ApplicationContext applicationContext =  null;

               applicationContext =new AnnotationConfigApplicationContext(SpringConfig.class);

System.out.println("Spring Config initialize :: ");

User user = (User) applicationContext.getBean("user");

user.setUserId(1);

user.setUserName("jk");

user.setEmail("jk@gmail.com");

user.setPassword("jk123");

System.out.println(user);

}

}

Here is output in console -

Spring Config initialize :: 

User [userId=1, userName=jk, password=jk123, email=jk@gmail.com]