{"id":31116,"date":"2023-10-10T09:59:34","date_gmt":"2022-11-29T21:27:59","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e7%ac%94%e8%ae%b0-3\/"},"modified":"2025-08-12T22:24:40","modified_gmt":"2025-08-12T14:24:40","slug":"java%e7%ac%94%e8%ae%b0-3","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e7%ac%94%e8%ae%b0-3\/","title":{"rendered":"Java\u7b14\u8bb0"},"content":{"rendered":"

\u5907\u5fd8\u5f55\u3002<\/p>\n

#Java: Java is a popular programming language that is widely used.<\/p>\n

\u6d41API<\/p>\n
\/\/ In: List<SalesLine><\/span>\r\n\/\/ Out: \u5546\u54c1\u30b3\u30fc\u30c9\u3092\u30ad\u30fc\u3001\u8ca9\u58f2\u6570\u5408\u8a08\u3092\u5024\u3068\u3059\u308b\u30de\u30c3\u30d7<\/span>\r\nMap<\/span><<\/span>String<\/span>,<\/span> Integer<\/span>><\/span> map<\/span> =<\/span>\r\n        list<\/span>.<\/span>stream<\/span>().<\/span>collect<\/span>(<\/span>\r\n                Collectors<\/span>.<\/span>groupingBy<\/span>(<\/span>SalesLine:<\/span>:<\/span>getProductCode<\/span>,<\/span>\r\n                        Collectors<\/span>.<\/span>summingInt<\/span>(<\/span>SalesLine:<\/span>:<\/span>getQuantity<\/span>)<\/span>\r\n                ));<\/span>\r\n<\/code><\/pre>\n
\n
\u5168\u89d2\u548c\u534a\u89d2\u7684\u8f6c\u6362\u7b49<\/p>\n
Normalizer<\/span>.<\/span>normalize<\/span>(<\/span>q<\/span>,<\/span> Normalizer<\/span>.<\/span>Form<\/span>.<\/span>NFKC<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528NUL\u5b57\u7b26\u62c6\u5206\u5b57\u7b26\u4e32\u5316<\/p>\n
String<\/span> messages<\/span> =<\/span> errors<\/span>.<\/span>getAllErrors<\/span>().<\/span>stream<\/span>().<\/span>map<\/span>(<\/span>e<\/span> -><\/span> e<\/span>.<\/span>getDefaultMessage<\/span>()).<\/span>collect<\/span>(<\/span>Collectors<\/span>.<\/span>joining<\/span>(<\/span>new<\/span> String<\/span>(<\/span>new<\/span> char<\/span>[]<\/span> {<\/span>0<\/span>})<\/span> ));<\/span>\r\nList<\/span><<\/span>String<\/span>><\/span> list<\/span> =<\/span> messages<\/span>.<\/span>split<\/span>(<\/span>new<\/span> String<\/span>(<\/span>new<\/span> char<\/span>[]<\/span> {<\/span>0<\/span>}));<\/span>\r\n<\/code><\/pre>\n
BigDecimal\u7684\u5c0f\u6570\u70b9\u540e\u4f4d\u6570\u56db\u820d\u4e94\u5165\uff08\u820d\u5165\u65b9\u5f0f\uff09<\/p>\n
Predicate<\/span><<\/span>Object<\/span>><\/span> isNull<\/span> =<\/span> Objects:<\/span>:<\/span>isNull<\/span>;<\/span>\r\nIntFunction<\/span><<\/span>Function<\/span><<\/span>RoundingMode<\/span>,<\/span> Function<\/span><<\/span>BigDecimal<\/span>,<\/span> BigDecimal<\/span>>>><\/span> setScale<\/span> =<\/span> i<\/span> -><\/span> r<\/span> -><\/span> n<\/span> -><\/span> ((<\/span>BigDecimal<\/span>)<\/span> isNull<\/span>.<\/span>test<\/span>(<\/span>n<\/span>)<\/span> ?<\/span> BigDecimal<\/span>.<\/span>ZERO<\/span> :<\/span> n<\/span>)).<\/span>setScale<\/span>(<\/span>i<\/span>,<\/span> r<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u7ed9\u4e09\u4f4d\u6570\u52a0\u4e0a\u9017\u53f7\u3002<\/p>\n
Predicate<\/span><<\/span>Object<\/span>><\/span> isNull<\/span> =<\/span> Objects:<\/span>:<\/span>isNull<\/span>;<\/span>\r\nPredicate<\/span><<\/span>Object<\/span>><\/span> isNumber<\/span> =<\/span> obj<\/span> -><\/span> obj<\/span> instanceof<\/span> Number<\/span>;<\/span>\r\nfinal<\/span> Function<\/span><<\/span>Object<\/span>,<\/span> String<\/span>><\/span> addComma<\/span> =<\/span> obj<\/span> -><\/span> {<\/span>\r\n    if<\/span> (<\/span>isNull<\/span>.<\/span>or<\/span>(<\/span>isNumber<\/span>.<\/span>negate<\/span>()).<\/span>test<\/span>(<\/span>obj<\/span>))<\/span> {<\/span>\r\n        return<\/span> null<\/span>;<\/span>\r\n    }<\/span>\r\n    if<\/span> (<\/span>obj<\/span> instanceof<\/span> BigDecimal<\/span>)<\/span> {<\/span>\r\n        return<\/span> String<\/span>.<\/span>format<\/span>(<\/span>\"%,d\"<\/span>,<\/span> ((<\/span>BigDecimal<\/span>)<\/span> obj<\/span>).<\/span>longValueExact<\/span>());<\/span>\r\n    }<\/span>\r\n    return<\/span> String<\/span>.<\/span>format<\/span>(<\/span>\"%,d\"<\/span>,<\/span> obj<\/span>);<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u5224\u65ad\u6570\u503c\u7c7b\u578b\u662f\u5426\u4e3a\u96f6<\/p>\n
Predicate<\/span><<\/span>Object<\/span>><\/span> isNull<\/span> =<\/span> Objects:<\/span>:<\/span>isNull<\/span>;<\/span>\r\nPredicate<\/span><<\/span>Object<\/span>><\/span> isNumber<\/span> =<\/span> obj<\/span> -><\/span> obj<\/span> instanceof<\/span> Number<\/span>;<\/span>\r\nPredicate<\/span><<\/span>Object<\/span>><\/span> isNumberZero<\/span> =<\/span> obj<\/span> -><\/span> {<\/span>\r\n    if<\/span> (<\/span>isNull<\/span>.<\/span>or<\/span>(<\/span>isNumber<\/span>.<\/span>negate<\/span>()).<\/span>test<\/span>(<\/span>obj<\/span>))<\/span> {<\/span>\r\n        return<\/span> false<\/span>;<\/span>\r\n    }<\/span>\r\n    if<\/span> (<\/span>obj<\/span> instanceof<\/span> BigDecimal<\/span>)<\/span> {<\/span>\r\n        return<\/span> BigDecimal<\/span>.<\/span>ZERO<\/span>.<\/span>compareTo<\/span>((<\/span>BigDecimal<\/span>)<\/span> obj<\/span>)<\/span> ==<\/span> 0<\/span>;<\/span>\r\n    }<\/span>\r\n    return<\/span> Objects<\/span>.<\/span>equals<\/span>((<\/span>long<\/span>)<\/span> obj<\/span>,<\/span> 0L<\/span>);<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u5c06Map\u4e2d\u7684BigDecimal\u76f8\u52a0\u3002<\/p>\n
hogeMap<\/span>.<\/span>merge<\/span>(<\/span>\"key1\"<\/span>,<\/span> BigDecimal<\/span>.<\/span>ONE<\/span>,<\/span> (<\/span>BigDecimal<\/span> sum<\/span>,<\/span> BigDecimal<\/span> val<\/span>)<\/span> -><\/span> sum<\/span>.<\/span>add<\/span>(<\/span>val<\/span>));<\/span>\r\n<\/code><\/pre>\n
\u5c06\u5176\u8f6c\u6362\u4e3aBigDecimal<\/p>\n
private<\/span> BigDecimal<\/span> toBigDecimal<\/span>(<\/span>final<\/span> Object<\/span> n<\/span>)<\/span> {<\/span>\r\n    if<\/span> (<\/span>Objects<\/span>.<\/span>isNull<\/span>(<\/span>n<\/span>))<\/span> {<\/span>\r\n        return<\/span> BigDecimal<\/span>.<\/span>ZERO<\/span>;<\/span>\r\n    }<\/span>\r\n    if<\/span> (<\/span>n<\/span> instanceof<\/span> java<\/span>.<\/span>lang<\/span>.<\/span>String<\/span>)<\/span> {<\/span>\r\n        return<\/span> new<\/span> BigDecimal<\/span>((<\/span>String<\/span>)<\/span> n<\/span>);<\/span>\r\n    }<\/span>\r\n    else<\/span> if<\/span> (<\/span>n<\/span> instanceof<\/span> Number<\/span>)<\/span> {<\/span>\r\n        return<\/span> BigDecimal<\/span>.<\/span>valueOf<\/span>((<\/span>Long<\/span>)<\/span> n<\/span>);<\/span>\r\n    }<\/span>\r\n    return<\/span> BigDecimal<\/span>.<\/span>ZERO<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7528\u4e8e\u68c0\u6d4b\u5bf9\u8c61\u4e0d\u4e00\u81f4\u7684\u5224\u5b9a<\/p>\n
BiPredicate<\/span><<\/span>Object<\/span>,<\/span> Object<\/span>><\/span> isNotEquals<\/span> =<\/span> ((<\/span>BiPredicate<\/span><<\/span>Object<\/span>,<\/span> Object<\/span>>)<\/span>Objects:<\/span>:<\/span>equals<\/span>).<\/span>negate<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u6df1\u5ea6\u590d\u5236\u4f7f\u7528java.util.Arrays\u8fdb\u884c\u6df1\u62f7\u8d1d\u3002<\/p>\n
int<\/span>[]<\/span> copySrc<\/span> =<\/span> new<\/span> int<\/span>[<\/span>5<\/span>];<\/span>\r\nArrays<\/span>.<\/span>fill<\/span>(<\/span>copySrc<\/span>,<\/span> 0<\/span>);<\/span>\r\nint<\/span>[]<\/span> copyDst<\/span> =<\/span> Arrays<\/span>.<\/span>copyOf<\/span>(<\/span>copySrc<\/span>,<\/span> copySrc<\/span>.<\/span>length<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u5bf9\u8c61\u7684\u6df1\u5ea6\u590d\u5236\u4f7f\u7528org.apache.commons.lang3.SerializationUtils#clone\u8fdb\u884c\u6df1\u62f7\u8d1d\u3002<\/p>\n
public<\/span> Object<\/span> deepCopy<\/span>(<\/span>Serializable<\/span> state<\/span>)<\/span> {<\/span>\r\n  return<\/span> SerializationUtils<\/span>.<\/span>clone<\/span>(<\/span>state<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4f18\u5148\u7ea7\u961f\u5217-\u4f18\u5148\u7ea7\u961f\u5217
\n\u6211\u4e0d\u592a\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u4f7f\u7528\u5b83\u3002<\/p>\n
AtCoder Regular Contest 028 – B – \u4f3c\u4e4e\u5bf9\u89e3\u51b3\u7279\u522b\u5956\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n
PriorityQueue<\/span><<\/span>Integer<\/span>><\/span> pQueue<\/span> =<\/span> new<\/span> PriorityQueue<\/span><<\/span>Integer<\/span>>();<\/span>\r\npQueue<\/span>.<\/span>offer<\/span>(<\/span>i<\/span>);<\/span>    \/\/ \u8ffd\u52a0<\/span>\r\npQueue<\/span>.<\/span>peek<\/span>(<\/span>i<\/span>);<\/span>     \/\/ \u53d6\u5f97\uff08\u30ad\u30e5\u30fc\u304b\u3089\u524a\u9664\u3057\u306a\u3044\uff09<\/span>\r\npQueue<\/span>.<\/span>poll<\/span>(<\/span>i<\/span>);<\/span>     \/\/ \u53d6\u5f97\uff08\u30ad\u30e5\u30fc\u304b\u3089\u524a\u9664\u3059\u308b\uff09<\/span>\r\n<\/code><\/pre>\n
\u8bf7\u53c2\u9605Dijkstra\u7b97\u6cd5\u3002\uff08Simplified Chinese: \u8bf7\u53c2\u9605\u8fea\u6770\u65af\u7279\u62c9\u7b97\u6cd5\u3002\uff09<\/p>\n
\u5c55\u793a\u5bf9\u8c61\u7684\u5185\u5bb9<\/p>\n
\/\/ commons-lang<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>ToStringBuilder<\/span>.<\/span>reflectionToString<\/span>(<\/span>new<\/span> Hoge<\/span>()));<\/span>\r\n\/\/ hoge$Hoge@cafb56[id=1,value=hoge,strValues={aaa,bbb,ccc},items=[ddd, eee, fff]]<\/span>\r\n<\/code><\/pre>\n
\u4e3a\u5bf9\u8c61\u5206\u914d\u54c8\u5e0c\u7801\u3002<\/p>\n
public<\/span> class<\/span> Clazz<\/span> implements<\/span> Serializable<\/span> {<\/span>\r\n  private<\/span> static<\/span> final<\/span> long<\/span> serialVersionUID<\/span> =<\/span> 1L<\/span>;<\/span>\r\n  public<\/span> int<\/span> hashCode<\/span>()<\/span> {<\/span>\r\n    return<\/span> HashCodeBuilder<\/span>.<\/span>reflectionHashCode<\/span>(<\/span>this<\/span>);<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u53ef\u4ee5\u7b80\u5355\u5730\u5199\u51fa\u5bf9\u8c61\u7684\u5339\u914d\u5224\u65ad<\/p>\n
public<\/span> class<\/span> Hoge<\/span> implements<\/span> Serializable<\/span> {<\/span>\r\n    private<\/span> static<\/span> final<\/span> long<\/span> serialVersionUID<\/span> =<\/span> 1L<\/span>;<\/span>\r\n \r\n    public<\/span> int<\/span> getId<\/span>()<\/span> {<\/span>\r\n        return<\/span> id<\/span>;<\/span>\r\n    }<\/span>\r\n \r\n    public<\/span> void<\/span> setId<\/span>(<\/span>int<\/span> id<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>id<\/span> =<\/span> id<\/span>;<\/span>\r\n    }<\/span>\r\n \r\n    @Override<\/span>\r\n    public<\/span> boolean<\/span> equals<\/span>(<\/span>Object<\/span> obj<\/span>)<\/span> {<\/span>\r\n        return<\/span> EqualsBuilder<\/span>.<\/span>reflectionEquals<\/span>(<\/span>this<\/span>,<\/span> obj<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u8fdb\u884c\u503c\u7684\u5224\u65ad\u548c\u533a\u522b\u8bf7\u4f7f\u7528Enum\u3002\u662f\u7684\u5427\uff5e<\/p>\n
if<\/span> (<\/span> Arrays<\/span>.<\/span>asList<\/span>(<\/span>\"Cat\"<\/span>,<\/span> \"Dog\"<\/span>,<\/span> \"Pig\"<\/span>).<\/span>contains<\/span>(<\/span>hoge<\/span>)<\/span> )<\/span> {<\/span>\r\n  \/\/ Do somthings.<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u521d\u59cb\u5316List<\/p>\n
List<\/span><<\/span>String<\/span>><\/span> list<\/span> =<\/span> new<\/span> ArrayList<\/span><>(<\/span>Arrays<\/span>.<\/span>asList<\/span>(<\/span>\"Cat\"<\/span>,<\/span> \"Dog\"<\/span>,<\/span> \"Pig\"<\/span>));<\/span>\r\n<\/code><\/pre>\n
\u6587\u4ef6\u540d\u6309\u5347\u5e8f\u6392\u5e8f<\/p>\n
\/\/ \u30d5\u30a1\u30a4\u30eb\u540d \u6607\u9806\u306b\u30bd\u30fc\u30c8<\/span>\r\nList<\/span><<\/span>File<\/span>><\/span> csvFileList<\/span> =<\/span> new<\/span> ArrayList<\/span><<\/span>File<\/span>>();<\/span>\r\ncsvFileList<\/span>.<\/span>add<\/span>(<\/span> new<\/span> File<\/span>(<\/span>\"###\"<\/span>)<\/span> );<\/span>\r\ncsvFileList<\/span>.<\/span>add<\/span>(<\/span> new<\/span> File<\/span>(<\/span>\"BBB\"<\/span>)<\/span> );<\/span>\r\ncsvFileList<\/span>.<\/span>add<\/span>(<\/span> new<\/span> File<\/span>(<\/span>\"111\"<\/span>)<\/span> );<\/span>\r\ncsvFileList<\/span>.<\/span>add<\/span>(<\/span> new<\/span> File<\/span>(<\/span>\"AAA\"<\/span>)<\/span> );<\/span>\r\n\r\nCollections<\/span>.<\/span>sort<\/span>(<\/span> csvFileList<\/span>,<\/span> new<\/span> Comparator<\/span><<\/span>File<\/span>>(){<\/span>\r\n   @Override<\/span>\r\n   public<\/span> int<\/span> compare<\/span>(<\/span> File<\/span> o1<\/span>,<\/span> File<\/span> o2<\/span> )<\/span> {<\/span>\r\n       return<\/span> StringUtils<\/span>.<\/span>compare<\/span>(<\/span> o1<\/span>.<\/span>getName<\/span>(),<\/span> o2<\/span>.<\/span>getName<\/span>()<\/span> );<\/span>\r\n   }<\/span>\r\n});<\/span>\r\n\r\nIterableUtils<\/span>.<\/span>forEach<\/span>(<\/span> csvFileList<\/span>,<\/span> new<\/span> Closure<\/span><<\/span>File<\/span>>(){<\/span>\r\n   @Override<\/span>\r\n   public<\/span> void<\/span> execute<\/span>(<\/span> File<\/span> file<\/span> )<\/span> {<\/span>\r\n       System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span> ReflectionToStringBuilder<\/span>.<\/span>toString<\/span>(<\/span> file<\/span> )<\/span> );<\/span>\r\n   }<\/span>\r\n});<\/span>\r\n<\/code><\/pre>\n
\u6625\u5929<\/p>\n
\u83b7\u53d6\u8d44\u6e90\u6587\u4ef6<\/p>\n
@Autowired<\/span>\r\nResourceLoader<\/span> resourceLoader<\/span>;<\/span>\r\n\r\nfinal<\/span> Resource<\/span> resource<\/span> =<\/span> resourceLoader<\/span>.<\/span>getResource<\/span>(<\/span>\"classpath:path\/to\/file\"<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u5c06BindingResult\u7684\u6d88\u606f\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u6570\u7ec4\u3002<\/p>\n
#<\/span> org<\/span>.<\/span>springframework<\/span>.<\/span>validation<\/span>.<\/span>BindingResult<\/span> errors<\/span>;<\/span>\r\nsetMessages<\/span>(<\/span>errors<\/span>.<\/span>getAllErrors<\/span>().<\/span>stream<\/span>().<\/span>map<\/span>(<\/span>e<\/span> -><\/span> e<\/span>.<\/span>getDefaultMessage<\/span>()).<\/span>toArray<\/span>(<\/span>String<\/span>[]::<\/span>new<\/span>));<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u5907\u5fd8\u5f55\u3002 #Java: Java is a popular programming language that […]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31116","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"\nJava\u7b14\u8bb0 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8eJava\u7b14\u8bb0\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\u7b14\u8bb0-3\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u7b14\u8bb0\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8eJava\u7b14\u8bb0\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u7b14\u8bb0-3\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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