方法是每位乘以该位的位权二进制位权等于2的位数减1次方所以1*2^2=40*2^1=01*2^0=11*2^(-1)=0.51*2^(-2)=0.25加起来就是5.75tity@Table(name = "t_users")public class User extends Model @Id @Column(name = "users_id") @GeneratedValue(strategy = GenerationType.AUTO) public Long userId; ...}以及好友关系实体,相关代码如下:@Entity@Table(name = "t_relationship")public class Relationship extends Model @Id @Column(name = "rs_id") public Long relationshipId; @Column(name = "rs_fromuser", nullable = false) public User fromUser; @Column(name = "rs_touser", nullable = false) public User toUser; ...}