Lombok

Lombok 主要用来节省一些写pojo class的effort, 是一个annotation based library.用以下的一些annotation 可以省去写一些代码。

Lombok annotations:
@Getter
@Setter
@NoArgsConstructor
@RequiredArgsConstructor
@AllArgsConstructor
@ToString
@EqualsAndHashCode
@Data

@Data is the combination of:
@Getter
@Setter
@RequiredArgsConstructor
@ToString
@EqualsAndHashCode
before:

public class Holiday {
    private String day;
    private String reason;
    private Type type;

    public Holiday(String day, String reason, Type type) {
        this.day = day;
        this.reason = reason;
        this.type = type;
    }

    public enum Type {
        FESTIVAL, FEDERAL
    }

    public Type getType() {
        return type;
    }

    public String getDay() {
        return day;
    }

    public String getReason() {
        return reason;
    }
}

after:

import lombok.Data;

@Data
public class Holiday {
    private String day;
    private String reason;
    private Type type;

    public enum Type {
        FESTIVAL, FEDERAL
    }

}

Lombok 的另一个feature是Slf4j, 可以用 @Slf4j 省略掉写Logger 类的功夫。
before:

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;


@Service
public class ContactService {
    private static Logger log = LoggerFactory.getLogger(ContactService.class);

    public boolean saveMessageDetail(Contact contact){
        boolean isSaved = true;
        log.info(contact.toString());
        return isSaved;
    }
}

after

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

@Slf4j
@Service
public class ContactService {
    public boolean saveMessageDetail(Contact contact){
        boolean isSaved = true;
        log.info(contact.toString());
        return isSaved;
    }
}

official site:
https://projectlombok.org/

refer：
https://auth0.com/blog/a-complete-guide-to-lombok/
https://www.baeldung.com/intro-to-project-lombok