BeanUtils.copyProperties目标对象没有源对象的属性，可以进行赋值

Question

BeanUtils.copyProperties把一个对象的属性赋值给另外一个对象，可是我的目标对象中没有与原对象相同的属性，为什么把这些属性都能给赋值呢

@Data
@ToString
public class GroupVO extends AttrGroupEntity {
    private List<AttrEntity> attrEntities;
    private List<AttrAttrgroupRelationEntity> relations;
}

@Data
public class AttrGroupEntity implements Serializable {

private static final long serialVersionUID = 1L;
private Long attrGroupId;

odelProperty(name = "attrGroupName", value = "组名")

private String attrGroupName;
private Integer sort;
private String descript;
private String icon;
private Long catelogId;

    GroupVO groupVO=new GroupVO();
    //查询group
    AttrGroupEntity groupEntity = this.getById(gid);
    BeanUtils.copyProperties(groupEntity,groupVO);

Answer 1

GroupVO extends AttrGroupEntity

使用到了继承关系,子类拥有的向上调用父类的set,get的方法, 相当于子类拥有了父类的私有字段属性。