为什么HQL查询是一串数字

Hibernate: 

    select

        student0_.SID as SID1_1_,

        student0_.SNAME as SNAME2_1_,

        student0_.SEX as SEX3_1_,

        student0_.gid as gid4_1_ 

    from

        STUDENT student0_

[Student@4ddbbdf8, Student@1115ec15, Student@82ea68c]

[Student@4ddbbdf8, Student@1115ec15, Student@82ea68c]

[Student@4ddbbdf8, Student@1115ec15, Student@82ea68c]