public class DemoService {    public void doSomething(){        System.out.println("find bean in default method");    }}

package com.wisely.spring4_2.3defaultMethod;import org.springframework.context.annotation.Bean;public interface DemoServiceConfig {    @Bean(name="demoService")    default DemoService DemoService(){        return new DemoService();    }}

package com.wisely.spring4_2.3defaultMethod;import org.springframework.context.annotation.Configuration;@Configuration

public class AppConfig implements DemoServiceConfig{}

package com.wisely.spring4_2.3defaultMethod;import org.springframework.context.annotation.AnnotationConfigApplicationContext;public class Main {    public static void main(String[] args) {         AnnotationConfigApplicationContext context =                    new AnnotationConfigApplicationContext("com.wisely.spring4_2.defaultMethod");         DemoService ds = context.getBean(DemoService.class);         ds.doSomething();    }}

输出结果 
    
     
   find bean in default method