请教一下各位大佬, api 文档中关于 Comparable 接口的这段话是什么意思,看了好几遍也没懂。 - V2EX
V2EX = way to explore
V2EX 是一个关于分享和探索的地方
现在注册
已注册用户请  登录
lr709
V2EX    Java

请教一下各位大佬, api 文档中关于 Comparable 接口的这段话是什么意思,看了好几遍也没懂。

  •  
  •   lr709 2022-03-22 13:55:12 +08:00 1947 次点击
    这是一个创建于 1380 天前的主题,其中的信息可能已经有所发展或是发生改变。

    For the mathematically inclined, the relation that defines the natural ordering on a given class C is:

     {(x, y) such that x.compareTo(y) <= 0}. 

    The quotient for this total order is:

     {(x, y) such that x.compareTo(y) == 0}. 

    It follows immediately from the contract for compareTo that the quotient is an equivalence relation on C, and that the natural ordering is a total order on C. When we say that a class's natural ordering is consistent with equals, we mean that the quotient for the natural ordering is the equivalence relation defined by the class's equals(Object) method:

     {(x, y) such that x.equals(y)}. 
    2 条回复    2022-03-30 12:23:57 +08:00
    GuuJiang
        1
    GuuJiang  
       2022-03-22 16:31:17 +08:00
    你看不懂是因为里面出现了大量的数学名词及概念,不用深究,如果确实感兴趣的话可以去请教数学专业的人,我简单说下粗浅的理解,可能不准确,以专业人士的结论为准
    整个这一段在说的就是 natural ordering 这个全序关系里的一个商构成一个等价关系,并且这个等价关系需要和 equals 构成的等价关系保持一致,至于关系、等价关系、关系的商这些就不展开了,去翻离散数学的书吧
    说人话就是,x.compareTo(y) == 0 iff x.equals(y)
    lr709
        2
    lr709  
    OP
       2022-03-30 12:23:57 +08:00
    @GuuJiang 谢谢。
    关于     帮助文档     自助推广系统     博客     API     FAQ     Solana     2165 人在线   最高记录 6679       Select Language
    创意工作者们的社区
    World is powered by solitude
    VERSION: 3.9.8.5 31ms UTC 16:00 PVG 00:00 LAX 08:00 JFK 11:00
    Do have faith in what you're doing.
    ubao msn snddm index pchome yahoo rakuten mypaper meadowduck bidyahoo youbao zxmzxm asda bnvcg cvbfg dfscv mmhjk xxddc yybgb zznbn ccubao uaitu acv GXCV ET GDG YH FG BCVB FJFH CBRE CBC GDG ET54 WRWR RWER WREW WRWER RWER SDG EW SF DSFSF fbbs ubao fhd dfg ewr dg df ewwr ewwr et ruyut utut dfg fgd gdfgt etg dfgt dfgd ert4 gd fgg wr 235 wer3 we vsdf sdf gdf ert xcv sdf rwer hfd dfg cvb rwf afb dfh jgh bmn lgh rty gfds cxv xcv xcs vdas fdf fgd cv sdf tert sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf shasha9178 shasha9178 shasha9178 shasha9178 shasha9178 liflif2 liflif2 liflif2 liflif2 liflif2 liblib3 liblib3 liblib3 liblib3 liblib3 zhazha444 zhazha444 zhazha444 zhazha444 zhazha444 dende5 dende denden denden2 denden21 fenfen9 fenf619 fen619 fenfe9 fe619 sdf sdf sdf sdf sdf zhazh90 zhazh0 zhaa50 zha90 zh590 zho zhoz zhozh zhozho zhozho2 lislis lls95 lili95 lils5 liss9 sdf0ty987 sdft876 sdft9876 sdf09876 sd0t9876 sdf0ty98 sdf0976 sdf0ty986 sdf0ty96 sdf0t76 sdf0876 df0ty98 sf0t876 sd0ty76 sdy76 sdf76 sdf0t76 sdf0ty9 sdf0ty98 sdf0ty987 sdf0ty98 sdf6676 sdf876 sd876 sd876 sdf6 sdf6 sdf9876 sdf0t sdf06 sdf0ty9776 sdf0ty9776 sdf0ty76 sdf8876 sdf0t sd6 sdf06 s688876 sd688 sdf86