Spring: SmartInitializingSingleton

package cn.edu.tju.service3;

import org.springframework.beans.factory.SmartInitializingSingleton;
import org.springframework.stereotype.Component;

@Component
public class MySmartService implements SmartInitializingSingleton {
    @Override
    public void afterSingletonsInstantiated() {
        System.out.println("this is smart: " + this);
    }
}