在java bean定義的時(shí)候沼填，需要給每個(gè)字段提供set和get屬性。
lombok這個(gè)插件所做的事情就是在編譯期間替我們干了這件事岩饼。
下面提供兩個(gè)文件的比對：
原始文件：
@Data
@NoArgsConstructor
public class AdvertiserQueryVO {
private String advertiserName;
private String jdId;
private String status;
private String chargeType;
}
編譯后的class籍茧，反編譯出來的文件：
public class AdvertiserQueryVO {
private String advertiserName;
private String jdId;
private String status;
private String chargeType;

public boolean equals(Object o) {
    if (o == this) return true;
    if (!(o instanceof AdvertiserQueryVO)) return false;
    AdvertiserQueryVO other = (AdvertiserQueryVO) o;
    if (!other.canEqual(this)) return false;
    Object this$advertiserName = getAdvertiserName();
    Object other$advertiserName = other.getAdvertiserName();
    if (this$advertiserName == null ? other$advertiserName != null : !this$advertiserName.equals(other$advertiserName))
        return false;
    Object this$jdId = getJdId();
    Object other$jdId = other.getJdId();
    if (this$jdId == null ? other$jdId != null : !this$jdId.equals(other$jdId)) return false;
    Object this$status = getStatus();
    Object other$status = other.getStatus();
    if (this$status == null ? other$status != null : !this$status.equals(other$status)) return false;
    Object this$chargeType = getChargeType();
    Object other$chargeType = other.getChargeType();
    return this$chargeType == null ? other$chargeType == null : this$chargeType.equals(other$chargeType);
}

public boolean canEqual(Object other) {
    return other instanceof AdvertiserQueryVO;
}

public int hashCode() {
    int PRIME = 59;
    int result = 1;
    Object $advertiserName = getAdvertiserName();
    result = result * 59 + ($advertiserName == null ? 0 : $advertiserName.hashCode());
    Object $jdId = getJdId();
    result = result * 59 + ($jdId == null ? 0 : $jdId.hashCode());
    Object $status = getStatus();
    result = result * 59 + ($status == null ? 0 : $status.hashCode());
    Object $chargeType = getChargeType();
    result = result * 59 + ($chargeType == null ? 0 : $chargeType.hashCode());
    return result;
}

public String toString() {
    return "AdvertiserQueryVO(advertiserName=" + getAdvertiserName() + ", jdId=" + getJdId() + ", status=" + getStatus() + ", chargeType=" + getChargeType() + ")";
}


public String getAdvertiserName() {
    return advertiserName;
}

public void setAdvertiserName(String advertiserName) {
    this.advertiserName = advertiserName;
}

public String getJdId() {
    return jdId;
}

public void setJdId(String jdId) {
    this.jdId = jdId;
}

public String getStatus() {
    return status;
}

public void setStatus(String status) {
    this.status = status;
}

public String getChargeType() {
    return chargeType;
}

public void setChargeType(String chargeType) {
    this.chargeType = chargeType;
}

public AdvertiserQueryVO() {
}

}
通過對兩個(gè)文件的比對硕糊，我們發(fā)現(xiàn)腊徙，加了@Data注解的類撬腾，編譯后會(huì)自動(dòng)給我們加上下列方法：

• 所有屬性的get和set方法
• toString 方法
• hashCode方法
• equals方法