This annotation can be used on any class directly or indirectly annotated with the @Component annotation or on methods annotated with the @Bean annotation.
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.ramsis</groupId>
<artifactId>springQualifierDemo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<springframework.version>5.1.5.RELEASE</springframework.version>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${springframework.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${springframework.version}</version>
</dependency>
</dependencies>
</project>
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Create CompanyInfo Class
package com.ramsis.bean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;
@Component
public class CompanyInfo {
@Autowired
@Qualifier("hyundai")
CompanyType companytype;
public void getInfo() {
companytype.getCompanyType();
}
}
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Create CompanyType Class
package com.ramsis.bean;
public interface CompanyType {
public void getCompanyType();
}
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Create Hyundai Class
package com.ramsis.bean;
import org.springframework.stereotype.Component;
@Component
public class Hyundai implements CompanyType {
@Override
public void getCompanyType() {
System.out.println("Hyundai making Automobiles.");
}
}
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Create Nokia Class
package com.ramsis.bean;
import org.springframework.stereotype.Component;
@Component
public class Nokia implements CompanyType {
@Override
public void getCompanyType() {
System.out.println("Nokia making Mobile Phones.");
}
}
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Create Reymond Class
package com.ramsis.bean;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
@Component
@Primary
public class Reymond implements CompanyType {
@Override
public void getCompanyType() {
System.out.println("Reymonds making fabrics and fashion products.");
}
}
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Create Runner Class
package com.ramsis.Main;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import com.ramsis.bean.CompanyInfo;
import com.ramsis.config.Config;
public class Runner {
public static void main(String args[]) {
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(Config.class);
CompanyInfo info =context.getBean("companyInfo",CompanyInfo.class);
info.getInfo();
context.close();
}
}
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Create Config Class
package com.ramsis.config;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
@Configuration
@ComponentScan(basePackages="com.ramsis.bean")
public class Config {
}
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