{"id":31391,"date":"2024-02-06T02:53:38","date_gmt":"2023-05-18T12:05:59","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e6%9e%9a%e4%b8%be%e7%b1%bb%e5%9e%8b%e7%9a%84%e5%85%a5%e9%97%a8\/"},"modified":"2025-08-12T23:48:21","modified_gmt":"2025-08-12T15:48:21","slug":"java%e6%9e%9a%e4%b8%be%e7%b1%bb%e5%9e%8b%e7%9a%84%e5%85%a5%e9%97%a8","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e6%9e%9a%e4%b8%be%e7%b1%bb%e5%9e%8b%e7%9a%84%e5%85%a5%e9%97%a8\/","title":{"rendered":"Java\u679a\u4e3e\u7c7b\u578b\u7684\u5165\u95e8"},"content":{"rendered":"

\u8fd9\u4e2a\u6587\u7ae0\u7684\u793a\u4f8b\u4ee3\u7801\u662f\u4e13\u95e8\u9488\u5bf9\u679a\u4e3e\u7684\u8bf4\u660e\u3002\u56e0\u6b64\uff0c\u5b83\u5305\u542b\u4e86\u4e00\u4e9b\u901a\u5e38\u88ab\u8ba4\u4e3a\u4e0d\u597d\u7684\u4ee3\u7801\uff08\u4f8b\u5982\uff0c\u5728\u8ba1\u7b97\u91d1\u989d\u65f6\u4f7f\u7528 int \u6216 double \u800c\u4e0d\u662f BigDecimal\uff09\u3002<\/p><\/blockquote>\n

\u5982\u4f55\u8868\u793a\u5206\u7c7b\u7b49<\/p>\n

\u6bd4\u5982, \u6211\u4eec\u8003\u8651\u4e00\u4e2a\u865a\u6784\u7684\u7535\u5b50\u5546\u52a1\u7f51\u7ad9\u7cfb\u7edf\u3002\u8fd9\u4e2a\u7f51\u7ad9\u6709\u4e09\u4e2a\u4f1a\u5458\u7b49\u7ea7\uff1a\u94dc\u724c\u4f1a\u5458\u3001\u94f6\u724c\u4f1a\u5458\u548c\u91d1\u724c\u4f1a\u5458\uff0c\u4e0d\u540c\u7b49\u7ea7\u7684\u4f1a\u5458\u4eab\u6709\u4e0d\u540c\u7684\u6298\u6263\u7387\u7b49\u4f18\u60e0\u3002\u6211\u4eec\u8981\u5982\u4f55\u8868\u8fbe\u8fd9\u4e2a\u5462\uff1f<\/p>\n

\u9996\u5148\uff0c\u8fd9\u662f\u4e00\u4e2a\u4e0d\u597d\u7684\u4f8b\u5b50\u3002<\/p>\n

public<\/span> class<\/span> Rank<\/span> {<\/span>\r\n    public<\/span> static<\/span> final<\/span> int<\/span> BRONZE<\/span> =<\/span> 1<\/span>;<\/span>\r\n    public<\/span> static<\/span> final<\/span> int<\/span> SILVER<\/span> =<\/span> 2<\/span>;<\/span>\r\n    public<\/span> static<\/span> final<\/span> int<\/span> GOLD<\/span> =<\/span> 3<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528\u6574\u6570\u5e38\u6570\u6765\u8868\u793a\u7b49\u7ea7\u3002\u8fd9\u6837\u505a\u4f1a\u6709\u4ec0\u4e48\u4e0d\u5229\u5f71\u54cd\u5462\uff1f<\/p>\n
\u5047\u8bbe\u6709\u4e00\u4e2a\u4ee5\u7b49\u7ea7\u4e3a\u53c2\u6570\u7684\u65b9\u6cd5\u3002<\/p>\n
public<\/span> class<\/span> PriceCalculator<\/span> {<\/span>\r\n    public<\/span> int<\/span> getDiscountPrice<\/span>(<\/span>int<\/span> price<\/span>,<\/span> int<\/span> rank<\/span>)<\/span> {<\/span>\r\n        switch<\/span> (<\/span>rank<\/span>)<\/span> {<\/span>\r\n            case<\/span> Rank<\/span>.<\/span>BRONZE<\/span>:<\/span>\r\n                return<\/span> price<\/span>;<\/span>\r\n            case<\/span> Rank<\/span>.<\/span>SILVER<\/span>:<\/span>\r\n                return<\/span> (<\/span>int<\/span>)<\/span> (<\/span>price<\/span> *<\/span> 0.9<\/span>);<\/span>\r\n            case<\/span> Rank<\/span>.<\/span>GOLD<\/span>:<\/span>\r\n                return<\/span> (<\/span>int<\/span>)<\/span> (<\/span>price<\/span> *<\/span> 0.8<\/span>);<\/span>\r\n            default<\/span>:<\/span>\r\n                throw<\/span> new<\/span> IllegalArgumentException<\/span>(<\/span>\"Invalid rank\"<\/span>);<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5e0c\u671b\u4f7f\u7528\u8fd9\u4e2a\u65b9\u6cd5\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u80fd\u591f\u6307\u5b9a\u4e3a Rank.BRONZE \u7b49\u7b49\u3002\u5c3d\u7ba1\u5df2\u7ecf\u5728 Javadoc \u4e2d\u8be6\u7ec6\u8bf4\u660e\u4e86\u8fd9\u4e00\u70b9\uff0c\u4f46\u8fd8\u662f\u53ef\u80fd\u4f1a\u6709\u4e00\u4e9b\u4eba\u6ca1\u6709\u9605\u8bfb\u5e76\u6309\u7167\u8bf4\u660e\u6765\u4f7f\u7528\u3002<\/p>\n
getDiscountPrice<\/span>(<\/span>10000<\/span>,<\/span> 1<\/span>);<\/span>  \/\/ \u5b9a\u6570\u3092\u4f7f\u308f\u305a\u306b\u30cf\u30fc\u30c9\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0<\/span>\r\ngetDiscountPrice<\/span>(<\/span>10000<\/span>,<\/span> 0<\/span>);<\/span>  \/\/ \u5b9a\u6570\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u5024\u3092\u6307\u5b9a<\/span>\r\n<\/code><\/pre>\n
\u53e6\u5916\uff0c\u6211\u4e5f\u5bf9\u6392\u540d\u548c\u6298\u6263\u7387\u8fd9\u4e24\u4e2a\u975e\u5e38\u76f8\u5173\u7684\u6570\u503c\u88ab\u8bb0\u5f55\u5728\u53e6\u4e00\u4e2a\u7c7b\u4e2d\u611f\u5230\u62c5\u5fe7\u3002\u8fd9\u6837\u540e\u9762\u7684\u7ef4\u62a4\u5de5\u4f5c\u53ef\u80fd\u4f1a\u975e\u5e38\u56f0\u96be\u3002<\/p>\n
\u5373\u4f7f\u5728\u76f8\u540c\u7684\u7b49\u7ea7\u7c7b\u522b\u5185\u5c06\u6298\u6263\u7387\u56fa\u5b9a\u5316\uff0c\u4e5f\u53ef\u80fd\u51fa\u73b0\u4e0e\u7b49\u7ea7\u7684\u5e38\u6570\u76f8\u540c\u7684\u73b0\u8c61\uff08\u5982\u786c\u7f16\u7801\uff09\u3002\u800c\u4e14\uff0c\u5f53\u9700\u8981\u4e0e\u7b49\u7ea7\u76f8\u5173\u7684\u6298\u6263\u7387\u4ee5\u5916\u7684\u503c\u65f6\uff0c\u8fdb\u4e00\u6b65\u589e\u52a0\u76f8\u540c\u7c7b\u578b\u7684\u5e38\u6570\u662f\u4e0d\u5e0c\u671b\u7684\u5427\u2026\u2026\u3002<\/p>\n
public<\/span> class<\/span> Rank<\/span> {<\/span>\r\n    public<\/span> static<\/span> final<\/span> int<\/span> BRONZE<\/span> =<\/span> 1<\/span>;<\/span>\r\n    public<\/span> static<\/span> final<\/span> int<\/span> SILVER<\/span> =<\/span> 2<\/span>;<\/span>\r\n    public<\/span> static<\/span> final<\/span> int<\/span> GOLD<\/span> =<\/span> 3<\/span>;<\/span>\r\n\r\n    \/\/ \u5b9a\u6570\u304c\u3069\u3093\u3069\u3093\u5897\u3048\u3066\u3044\u304f<\/span>\r\n    public<\/span> static<\/span> final<\/span> double<\/span> DISCOUNT_RATE_BRONZE<\/span> =<\/span> 0.0<\/span>;<\/span>\r\n    public<\/span> static<\/span> final<\/span> double<\/span> DISCOUNT_RATE_SILVER<\/span> =<\/span> 0.1<\/span>;<\/span>\r\n    public<\/span> static<\/span> final<\/span> double<\/span> DISCOUNT_RATE_GOLD<\/span> =<\/span> 0.2<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u679a\u4e3e\uff08enum\uff09\u662f\u4ec0\u4e48\uff1f<\/p>\n
\u5728\u8fd9\u91cc\u51fa\u73b0\u7684\u662f\u679a\u4e3e\u3002\u65e5\u8bed\u4e2d\u4e5f\u88ab\u79f0\u4e3a\u201c\u5217\u4e3e\u7c7b\u578b\u201d\u3002<\/p>\n
\u4ee5\u4e0b\u662f enum \u7684\u542b\u4e49\u3002<\/p>\n
public<\/span> enum<\/span> Rank<\/span> {<\/span>\r\n    \/\/ \u5b9a\u6570<\/span>\r\n    BRONZE<\/span>(<\/span>0.0<\/span>),<\/span>\r\n    SILVER<\/span>(<\/span>0.1<\/span>),<\/span>\r\n    GOLD<\/span>(<\/span>0.2<\/span>);<\/span>\r\n\r\n    \/\/ \u30d5\u30a3\u30fc\u30eb\u30c9<\/span>\r\n    private<\/span> final<\/span> double<\/span> discountRate<\/span>;<\/span>\r\n\r\n    \/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf<\/span>\r\n    private<\/span> Rank<\/span>(<\/span>double<\/span> discountRate<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>discountRate<\/span> =<\/span> discountRate<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    \/\/ \u30e1\u30bd\u30c3\u30c9<\/span>\r\n    public<\/span> int<\/span> getDiscountPrice<\/span>(<\/span>int<\/span> price<\/span>)<\/span> {<\/span>\r\n        return<\/span> (<\/span>int<\/span>)<\/span> (<\/span>price<\/span> *<\/span> (<\/span>1<\/span> -<\/span> discountRate<\/span>));<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
enum\u662f\u4e00\u4e2a\u5177\u6709\u4ee5\u4e0b\u7279\u70b9\u7684\u7279\u6b8a\u7c7b\u3002<\/p>\n
    \n\u30d5\u30a3\u30fc\u30eb\u30c9\u30fb\u30e1\u30bd\u30c3\u30c9\u306f\u666e\u901a\u306e\u30af\u30e9\u30b9\u3068\u540c\u69d8\u306b\u5b9a\u7fa9\u3067\u304d\u308b
    \n\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306fprivate\u306b\u3057\u304b\u3067\u304d\u306a\u3044\uff1d\u5916\u90e8\u304b\u3089\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u306f\u4e0d\u53ef\u80fd<\/p>\n
    \u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u304c\u7121\u3044\u5834\u5408\u306fprivate\u3068\u89e3\u91c8\u3055\u308c\u308b<\/p>\n
    public\u30fbprotected\u3092\u4ed8\u3051\u308b\u3068\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/p>\n
    \u30af\u30e9\u30b9\u76f4\u4e0b\u306b\u5b9a\u6570\u3092\u5ba3\u8a00\u3059\u308b<\/p>\n
    \u3053\u308c\u3089\u306e\u5b9a\u6570\u306f\u81ea\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9
    \n\u81ea\u30af\u30e9\u30b9\u306epublic static final\u306a\u30d5\u30a3\u30fc\u30eb\u30c9\u3068\u306a\u308b<\/p>\n<\/ul>\n
    \u6362\u53e5\u8bdd\u8bf4\uff0cBRONZE\uff0cSILVER\u548cGOLD\u662fRank\u7c7b\u7684\u5b9e\u4f8b\uff0c\u540c\u65f6\u4e5f\u662fRank\u7c7b\u7684\u516c\u5171\u9759\u6001\u5e38\u91cf\u5b57\u6bb5\u3002<\/p>\n
    \uff08\uff09\u4e2d\u6307\u5b9a\u7684\u503c\u662f\u4f20\u9012\u7ed9\u6784\u9020\u51fd\u6570\u7684\u53c2\u6570\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5b83\u5c06\u6210\u4e3a\u6784\u9020\u51fd\u6570\u4e2ddiscountRate\u5b57\u6bb5\u7684\u503c\u3002<\/p>\n
    \u4ee5\u81ea\u7136\u7684\u65b9\u5f0f\u7ffb\u8bd1\u6210\u4e2d\u6587\uff0c\u53ef\u4ee5\u63cf\u8ff0\u5982\u4e0b\uff1a
    \n\u5982\u679c\u7528\u4e2d\u6587\u8868\u8fbe\uff0c\u53ef\u4ee5\u8fd9\u6837\u63cf\u8ff0\uff1a
    \n\u5f3a\u884c\u5c06\u5176\u5f52\u7c7b\u4e3a\u4e00\u7c7b\u8bfe\u7a0b\u65f6\uff0c\u53ef\u4ee5\u5f62\u8c61\u5730\u63cf\u7ed8\u4e3a\u8fd9\u6837\u3002<\/p>\n
    \u4f46\u662f\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5b83\u4e0e\u5b9e\u9645\u7684\u679a\u4e3e\u7c7b\u578b\u4e0d\u540c\u3002\u8bf7\u628a\u5b83\u4ec5\u4ec5\u5f53\u505a\u4e00\u79cd\u60f3\u8c61\u3002<\/p><\/blockquote>\n
    public<\/span> class<\/span> Rank<\/span> {<\/span>\r\n    \/\/ \u5b9a\u6570<\/span>\r\n    public<\/span> static<\/span> final<\/span> Rank<\/span> BRONZE<\/span> =<\/span> new<\/span> Rank<\/span>(<\/span>0.0<\/span>);<\/span>\r\n    public<\/span> static<\/span> final<\/span> Rank<\/span> SILVER<\/span> =<\/span> new<\/span> Rank<\/span>(<\/span>0.1<\/span>);<\/span>\r\n    public<\/span> static<\/span> final<\/span> Rank<\/span> GOLD<\/span> =<\/span> new<\/span> Rank<\/span>(<\/span>0.2<\/span>);<\/span>\r\n\r\n    \/\/ \u30d5\u30a3\u30fc\u30eb\u30c9<\/span>\r\n    private<\/span> final<\/span> double<\/span> discountRate<\/span>;<\/span>\r\n\r\n    \/\/ \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf<\/span>\r\n    private<\/span> Rank<\/span>(<\/span>double<\/span> discountRate<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>discountRate<\/span> =<\/span> discountRate<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    \/\/ \u30e1\u30bd\u30c3\u30c9<\/span>\r\n    public<\/span> int<\/span> getDiscountPrice<\/span>(<\/span>int<\/span> price<\/span>)<\/span> {<\/span>\r\n        return<\/span> (<\/span>int<\/span>)<\/span> (<\/span>price<\/span> *<\/span> (<\/span>1<\/span> -<\/span> discountRate<\/span>));<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u5728\u4e2d\u56fd\u7684\u6bcd\u8bed\u4e2d\uff0c”enum\u7684\u4f55\u5904\u4ee4\u4eba\u9ad8\u5174”\u53ef\u4ee5\u88ab\u89e3\u91ca\u4e3a”\u679a\u4e3e\u7c7b\u578b\u7684\u54ea\u4e9b\u65b9\u9762\u4ee4\u4eba\u6b23\u559c”\u3002<\/p>\n
    \u603b\u800c\u8a00\u4e4b\uff0c\u53ef\u4ee5\u901a\u8fc7\u89e3\u51b3\u524d\u9762\u63d0\u5230\u7684int\u5e38\u91cf\u7684\u95ee\u9898\u6765\u89e3\u51b3\u3002<\/p>\n
    \u5982\u679c\u6709\u4e00\u4e2a\u63a5\u53d7\u7b49\u7ea7\u4e3a\u53c2\u6570\u7684\u65b9\u6cd5\uff0c\u5728\u6307\u5b9a\u672a\u5b9a\u4e49\u7684\u503c\u6216\u8005\u4e0d\u4f7f\u7528\u5e38\u91cf\u786c\u7f16\u7801\u7684\u60c5\u51b5\u4e0b\u5c06\u53d8\u5f97\u4e0d\u53ef\u80fd\u3002<\/p>\n
    \/\/ Rank\u306b\u5b9a\u7fa9\u3055\u308c\u305f\u5b9a\u6570\uff08BRONZE\u30fbSILVER\u30fbGOLD\uff09\u4ee5\u5916\u306f\u5f15\u6570\u306b\u6307\u5b9a\u3067\u304d\u306a\u3044\uff01<\/span>\r\npublic<\/span> void<\/span> doSomething<\/span>(<\/span>Rank<\/span> rank<\/span>)<\/span> {<\/span>\r\n    ...<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u5f53\u7136\uff0cnull\u53ef\u4ee5\u4f5c\u4e3a\u53c2\u6570\u8fdb\u884c\u6307\u5b9a\u3002\u8fd9\u5728Java\u7684\u8bed\u6cd5\u4e0a\u662f\u65e0\u6cd5\u907f\u514d\u7684\u5462… ?<\/p><\/blockquote>\n
    \u6b64\u5916\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u6392\u540d\uff08rank\uff09\u548c\u6298\u6263\u7387\uff08discountRate\uff09\u8fd9\u4e24\u4e2a\u975e\u5e38\u76f8\u5173\u7684\u503c\u5408\u5e76\u5230\u4e00\u4e2a\u7c7b\u4e2d\u3002\u8fd9\u6837\u4e00\u6765\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u5728\u540c\u4e00\u4e2a\u7c7b\u5185\u5b9a\u4e49\u4e00\u4e2a\u4f7f\u7528\u6298\u6263\u7387\u7684\u65b9\u6cd5\uff08getDiscountPrice()\uff09\u3002 \u8fd9\u6837\u505a\u5bf9\u4e8e\u7ef4\u62a4\u6765\u8bf4\u4f1a\u66f4\u52a0\u8f7b\u677e\uff01<\/p>\n
    \u5efa\u8bae\u9605\u8bfb\u4e0b\u4e00\u672c\u4e66\uff0c\u4ee5\u4e86\u89e3\u66f4\u591a\u6709\u5173enum\u7684\u5e94\u7528\u6280\u5de7\u3002<\/p>\n
      \n\u73fe\u5834\u3067\u5f79\u7acb\u3064\u30b7\u30b9\u30c6\u30e0\u8a2d\u8a08\u306e\u539f\u5247
      \nSoftware Design 2021\u5e743\u6708\u53f7\u306e\u7279\u96c6\u300cJava\u3067\u3082\u3046\u4e00\u5ea6\u5b66\u3073\u76f4\u3059\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u300d\n<\/ul>\n
      \u6839\u636e\u4e0d\u540c\u7684\u8bbe\u5b9a\u503c\u6765\u8fdb\u884c\u5904\u7406\uff0c\u4ee5\u51cf\u5c11\u4f7f\u7528\u8005\u7aef\u7684\u6761\u4ef6\u5224\u65ad\u3002<\/p>\n
      public<\/span> double<\/span> calc<\/span>(<\/span>double<\/span> x<\/span>,<\/span> double<\/span> y<\/span>,<\/span> Operation<\/span> ope<\/span>)<\/span> {<\/span>\r\n    switch<\/span>(<\/span>ope<\/span>)<\/span> {<\/span>\r\n    case<\/span> PLUS:<\/span>\r\n        return<\/span> x<\/span> +<\/span> y<\/span>;<\/span>\r\n    case<\/span> MINUS:<\/span>\r\n        return<\/span> x<\/span> -<\/span> y<\/span>;<\/span>\r\n    case<\/span> TIMES:<\/span>\r\n        return<\/span> x<\/span> *<\/span> y<\/span>;<\/span>\r\n    case<\/span> DIVIDED_BY:<\/span>\r\n        return<\/span> x<\/span> \/<\/span> y<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
      \u8ba9\u6211\u4eec\u5728enum\u7684\u6bcf\u4e2a\u5e38\u6570\u4e2d\u52a0\u5165\u8be5\u6761\u4ef6\u5206\u652f\u7684\u903b\u8f91\u3002\u8fd9\u6837\u4e00\u6765\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u6d88\u9664\u4f7f\u7528\u65b9\u7684\u6761\u4ef6\u5224\u65ad\u3002<\/p>\n
      public<\/span> double<\/span> calc<\/span>(<\/span>double<\/span> x<\/span>,<\/span> double<\/span> y<\/span>,<\/span> Operation<\/span> ope<\/span>)<\/span> {<\/span>\r\n    return<\/span> ope<\/span>.<\/span>eval<\/span>(<\/span>x<\/span>,<\/span> y<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
      \u53ea\u9700\u4e00\u79cd\u9009\u62e9\uff0c\u8bf7\u7528\u4e2d\u6587\u5c06\u4ee5\u4e0b\u5185\u5bb9\u8fdb\u884c\u6539\u8ff0\uff1a
      \n\u7b2c\u4e00\u79cd\u65b9\u6cd5\u662f\u9488\u5bf9\u6bcf\u4e2a\u7279\u5b9a\u7684\u6570\u503c\uff0c\u5bf9\u65b9\u6cd5\u8fdb\u884c\u8986\u76d6\u3002<\/p>\n
      \u8fd9\u6bb5\u4ee3\u7801\u662f\u4eceJava Language Specification\u501f\u6765\u7684\uff0c\u5e76\u7a0d\u4f5c\u4fee\u6539\uff08URL\u2192https:\/\/docs.oracle.com\/javase\/specs\/jls\/se11\/html\/jls-8.html#d5e15436\uff09\u3002<\/p><\/blockquote>\n
      enum<\/span> Operation<\/span> {<\/span>\r\n    PLUS<\/span> {<\/span>\r\n        @Override<\/span>\r\n        double<\/span> eval<\/span>(<\/span>double<\/span> x<\/span>,<\/span> double<\/span> y<\/span>)<\/span> {<\/span>\r\n            return<\/span> x<\/span> +<\/span> y<\/span>;<\/span>\r\n        }<\/span>\r\n    },<\/span>\r\n    MINUS<\/span> {<\/span>\r\n        @Override<\/span>\r\n        double<\/span> eval<\/span>(<\/span>double<\/span> x<\/span>,<\/span> double<\/span> y<\/span>)<\/span> {<\/span>\r\n            return<\/span> x<\/span> -<\/span> y<\/span>;<\/span>\r\n        }<\/span>\r\n    },<\/span>\r\n    TIMES<\/span> {<\/span>\r\n        @Override<\/span>\r\n        double<\/span> eval<\/span>(<\/span>double<\/span> x<\/span>,<\/span> double<\/span> y<\/span>)<\/span> {<\/span>\r\n            return<\/span> x<\/span> *<\/span> y<\/span>;<\/span>\r\n        }<\/span>\r\n    },<\/span>\r\n    DIVIDED_BY<\/span> {<\/span>\r\n        @Override<\/span>\r\n        double<\/span> eval<\/span>(<\/span>double<\/span> x<\/span>,<\/span> double<\/span> y<\/span>)<\/span> {<\/span>\r\n            return<\/span> x<\/span> \/<\/span> y<\/span>;<\/span>\r\n        }<\/span>\r\n    };<\/span>\r\n\r\n    abstract<\/span> double<\/span> eval<\/span>(<\/span>double<\/span> x<\/span>,<\/span> double<\/span> y<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
      \u9019\u662f\u533f\u540d\u985e\u5225\u7684\u8a9e\u6cd5\u5beb\u6cd5\u3002<\/p><\/blockquote>\n
      \u65b9\u6848\u4e8c\uff1a\u7ec4\u5408\u63a5\u53e3<\/p>\n
      \u5982\u679c\u903b\u8f91\u5f88\u590d\u6742\u7684\u8bdd\uff0c\u4e5f\u8bb8\u9009\u62e9\u8fd9\u4e2a\u53ef\u80fd\u66f4\u597d\u3002<\/p>\n
      interface<\/span> Calculator<\/span> {<\/span>\r\n    double<\/span> eval<\/span>(<\/span>double<\/span> x<\/span>,<\/span> double<\/span> y<\/span>);<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> PlusCalculator<\/span> implements<\/span> Calculator<\/span> {<\/span>\r\n    @Override<\/span>\r\n    public<\/span> double<\/span> eval<\/span>(<\/span>double<\/span> x<\/span>,<\/span> double<\/span> y<\/span>)<\/span> {<\/span>\r\n        return<\/span> x<\/span> +<\/span> y<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> MinusCalculator<\/span> implements<\/span> Calculator<\/span> {<\/span>\r\n    @Override<\/span>\r\n    public<\/span> double<\/span> eval<\/span>(<\/span>double<\/span> x<\/span>,<\/span> double<\/span> y<\/span>)<\/span> {<\/span>\r\n        return<\/span> x<\/span> -<\/span> y<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> TimesCalculator<\/span> implements<\/span> Calculator<\/span> {<\/span>\r\n    @Override<\/span>\r\n    public<\/span> double<\/span> eval<\/span>(<\/span>double<\/span> x<\/span>,<\/span> double<\/span> y<\/span>)<\/span> {<\/span>\r\n        return<\/span> x<\/span> *<\/span> y<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> DivideCalculator<\/span> implements<\/span> Calculator<\/span> {<\/span>\r\n    @Override<\/span>\r\n    public<\/span> double<\/span> eval<\/span>(<\/span>double<\/span> x<\/span>,<\/span> double<\/span> y<\/span>)<\/span> {<\/span>\r\n        return<\/span> x<\/span> \/<\/span> y<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
      enum<\/span> Operation<\/span> {<\/span>\r\n    PLUS<\/span>(<\/span>new<\/span> PlusCalculator<\/span>()),<\/span>\r\n    MINUS<\/span>(<\/span>new<\/span> MinusCalculator<\/span>()),<\/span>\r\n    TIMES<\/span>(<\/span>new<\/span> TimesCalculator<\/span>()),<\/span>\r\n    DIVIDED_BY<\/span>(<\/span>new<\/span> DivideCalculator<\/span>());<\/span>\r\n\r\n    private<\/span> final<\/span> Calculator<\/span> calculator<\/span>;<\/span>\r\n\r\n    Operation<\/span>(<\/span>Calculator<\/span> calculator<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>calculator<\/span> =<\/span> calculator<\/span>\r\n    }<\/span>\r\n\r\n    double<\/span> eval<\/span>(<\/span>double<\/span> x<\/span>,<\/span> double<\/span> y<\/span>)<\/span> {<\/span>\r\n        return<\/span> calculator<\/span>.<\/span>eval<\/span>(<\/span>x<\/span>,<\/span> y<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
      [\u9ad8\u968e\u7de8] enum\u662fEnum\u7684\u5b50\u7c7b<\/p>\n
      enum\u4f5c\u4e3ajava.lang.Enum\u7684\u5b50\u7c7b\u88ab\u9690\u5f0f\u5b9a\u4e49\u3002\u8fd9\u610f\u5473\u7740\u53ef\u4ee5\u4f7f\u7528Enum\u7c7b\u7684\u6240\u6709\u65b9\u6cd5\u3002<\/p>\n
      \u679a\u4e3e\u7c7b\u7684\u65b9\u6cd5\u5217\u8868 \u2192 https:\/\/docs.oracle.com\/javase\/jp\/11\/docs\/api\/java.base\/java\/lang\/Enum.html<\/p>\n
      \u987a\u4fbf\u63d0\u4e00\u53e5\uff0c\u6cdb\u578b\u53c2\u6570E\u5c06\u88ab\u5b9a\u4e49\u7684\u679a\u4e3e\u81ea\u8eab\u586b\u5145\u3002\u6362\u53e5\u8bdd\u8bf4\u5c31\u662f\u8fd9\u6837\u3002<\/p>\n
      public<\/span> class<\/span> Rank<\/span> extends<\/span> Enum<\/span><<\/span>Rank<\/span>><\/span> {<\/span>\r\n    ...<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
      \u7279\u522b\u91cd\u8981\u7684\u662f\u5728Enum\u5b9a\u4e49\u7684\u65b9\u6cd5\u4e2d\uff0c\u4ee5\u4e0b\u662f\u5176\u4e2d\u7684\u4e00\u4e9b\u3002<\/p>\n
      \n
      \n\n\n\u30e1\u30bd\u30c3\u30c9<\/th>\n\u8aac\u660e<\/th>\n<\/tr>\n<\/thead>\n\n\nString name()<\/code><\/td>\n\u5b9a\u6570\u540d\u3092\u8fd4\u3059<\/td>\n<\/tr>\n\nString toString()<\/code><\/td>\n\u5b9a\u6570\u540d\u3092\u8fd4\u3059<\/td>\n<\/tr>\n\nint ordinal()<\/code><\/td>\n\u5b9a\u6570\u304c\u5ba3\u8a00\u3055\u308c\u305f\u9806\u756a\u3092\u8fd4\u3059\uff08\u6700\u521d\u306e\u5b9a\u6570\u304c0<\/code>\uff09<\/td>\n<\/tr>\n<\/tbody>\n
      \u6b64\u5916\uff0c\u5728\u5b9a\u4e49\u679a\u4e3e\u65f6\u8fd8\u4f1a\u81ea\u52a8\u521b\u5efa\u65b9\u6cd5\u3002<\/p>\n
      \n
      \n\n\n\u30e1\u30bd\u30c3\u30c9<\/th>\n\u8aac\u660e<\/th>\n<\/tr>\n<\/thead>\n\n\nstatic <T extends Enum<T>> T[] values()<\/code><\/td>\n\u5168\u5b9a\u6570\u306e\u914d\u5217\u3092\u8fd4\u3059\uff08\u9806\u756a\u306f\u5ba3\u8a00\u3055\u308c\u305f\u3068\u304a\u308a\uff09<\/td>\n<\/tr>\n\nstatic <T extends Enum<T>> T valueOf(String name)<\/code><\/td>\n\u5f15\u6570\u3067\u6307\u5b9a\u3055\u308c\u305f\u540d\u524d\uff08\u5b8c\u5168\u4e00\u81f4\uff09\u306e\u5b9a\u6570\u3092\u8fd4\u3059<\/td>\n<\/tr>\n<\/tbody>\n
      Rank<\/span>[]<\/span> ranks<\/span> =<\/span> Rank<\/span>.<\/span>values<\/span>();<\/span>\r\nRank<\/span> rank<\/span> =<\/span> Rank<\/span>.<\/span>valueOf<\/span>(<\/span>\"GOLD\"<\/span>);<\/span>  \/\/ Rank.GOLD\u304c\u8fd4\u308b<\/span>\r\n<\/code><\/pre>\n
      [\u9ad8\u7ea7\u7f16\u8f91]\u4f7f\u7528EnumSet<\/p>\n
      java.util.EnumSet\u7c7b\u662f\u4e00\u4e2a\u540d\u4e3aenum\u7684Set\u3002<\/p>\n
      \u5047\u8bbe\u53ea\u6709\u94f6\u724c\u4f1a\u5458\u548c\u91d1\u724c\u4f1a\u5458\u53ef\u4ee5\u9886\u53d6\u793c\u7269\u3002\u8981\u5b9e\u73b0\u8fd9\u4e2a\u5224\u65ad\u65b9\u6cd5\uff0c\u8be5\u5982\u4f55\u5b9e\u65bd\u5462\uff1f<\/p>\n
      public<\/span> boolean<\/span> canGetPresent<\/span>(<\/span>Rank<\/span> rank<\/span>)<\/span> {<\/span>\r\n    return<\/span> rank<\/span> ==<\/span> Rank<\/span>.<\/span>GOLD<\/span> ||<\/span> rank<\/span> ==<\/span> Rank<\/span>.<\/span>SILVER<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
      \u5728\u8fd9\u4e2a\u89c4\u6a21\u4e0a\uff0c\u4e5f\u8bb8\u611f\u89c9\u8fd8\u4e0d\u9519\u3002\u4f46\u662f\uff0c\u5982\u679c\u6392\u540d\u6570\u91cf\u53d8\u4e3a\u4e8610\u4e2a\uff0c\u5e76\u4e14\u80fd\u591f\u9886\u53d6\u5956\u52b1\u7684\u6392\u540d\u53d8\u4e3a\u4e865\u4e2a\uff0c\u90a3\u4f1a\u600e\u4e48\u6837\u5462\uff1f\u5199\u7684\u65f6\u5019\u548c\u8bfb\u7684\u65f6\u5019\u90fd\u5f88\u8f9b\u82e6\u5462\u3002<\/p>\n
      \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528EnumSet\u3002<\/p>\n
      import<\/span> java.util.EnumSet<\/span>;<\/span>\r\n\r\npublic<\/span> enum<\/span> Rank<\/span> {<\/span>\r\n    BRONZE<\/span>(<\/span>1.0<\/span>),<\/span>\r\n    SILVER<\/span>(<\/span>0.9<\/span>),<\/span>\r\n    GOLD<\/span>(<\/span>0.8<\/span>);<\/span>\r\n\r\n    \/\/ \u30d5\u30a3\u30fc\u30eb\u30c9\u7b49\u7701\u7565<\/span>\r\n\r\n    \/\/ EnumSet\u3092\u5229\u7528\uff01<\/span>\r\n    private<\/span> static<\/span> final<\/span> EnumSet<\/span><<\/span>Rank<\/span>><\/span> ranksCanGetPresent<\/span> =<\/span> EnumSet<\/span>.<\/span>of<\/span>(<\/span>SILVER<\/span>,<\/span> GOLD<\/span>);<\/span>\r\n\r\n    public<\/span> boolean<\/span> canGetPresent<\/span>()<\/span> {<\/span>\r\n        \/\/ EnumSet#contains()\u3092\u5229\u7528<\/span>\r\n        return<\/span> ranksCanGetPresent<\/span>.<\/span>contains<\/span>(<\/span>this<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
      Rank<\/span> rank<\/span> =<\/span> ...;<\/span>\r\nif<\/span> (<\/span>rank<\/span>.<\/span>canGetPresent<\/span>())<\/span> {<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30d7\u30ec\u30bc\u30f3\u30c8\u3092\u3069\u3046\u305e\uff01\"<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
      \u8fd9\u6837\u7684\u8bdd\uff0c\u5373\u4f7f\u7b49\u7ea7\u589e\u52a0\u4e5f\u5f88\u5bb9\u6613\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
      \u8fd9\u4e2a\u6587\u7ae0\u7684\u793a\u4f8b\u4ee3\u7801\u662f\u4e13\u95e8\u9488\u5bf9\u679a\u4e3e\u7684\u8bf4\u660e\u3002\u56e0\u6b64\uff0c\u5b83\u5305\u542b\u4e86\u4e00\u4e9b\u901a\u5e38\u88ab\u8ba4\u4e3a\u4e0d\u597d\u7684\u4ee3\u7801\uff08\u4f8b\u5982\uff0c\u5728\u8ba1\u7b97\u91d1\u989d\u65f6\u4f7f\u7528 int […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31391","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"\nJava\u679a\u4e3e\u7c7b\u578b\u7684\u5165\u95e8 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8eJava\u679a\u4e3e\u7c7b\u578b\u7684\u5165\u95e8\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u679a\u4e3e\u7c7b\u578b\u7684\u5165\u95e8\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u679a\u4e3e\u7c7b\u578b\u7684\u5165\u95e8\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8eJava\u679a\u4e3e\u7c7b\u578b\u7684\u5165\u95e8\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u679a\u4e3e\u7c7b\u578b\u7684\u5165\u95e8\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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