{"id":31220,"date":"2023-11-14T05:03:49","date_gmt":"2023-07-22T11:43:01","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e5%bf%ab%e9%80%9f%e5%8f%82%e8%80%83%e6%8c%87%e5%8d%97\/"},"modified":"2025-08-12T22:54:44","modified_gmt":"2025-08-12T14:54:44","slug":"java-%e5%bf%ab%e9%80%9f%e5%8f%82%e8%80%83%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e5%bf%ab%e9%80%9f%e5%8f%82%e8%80%83%e6%8c%87%e5%8d%97\/","title":{"rendered":"Java \u5feb\u901f\u53c2\u8003\u6307\u5357"},"content":{"rendered":"

\u4e3a\u4e86\u4ec0\u4e48\u800c\u52aa\u529b\u8fbe\u5230\u7684\u76ee\u6807\u3002\u4eba\u4eec\u4f1a\u5fd8\u8bb0\u4e8b\u7269\u3002
\n\u5982\u679c\u7528\u5404\u79cd\u8bed\u8a00\u5199\u4e0b\u6765\uff0c\u53ef\u80fd\u4f1a\u66f4\u52a0\u663e\u8457\u3002
\n\u5728\u5199\u4e4b\u524d\u6d4f\u89c8\u4e00\u4e0b\u53ef\u80fd\u4f1a\u66f4\u987a\u5229\u3002<\/p>\n

\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/p>\n
\n
\u578b\u8aac\u660e\u7bc4\u56f2byte\u6574\u65708\u30d3\u30c3\u30c8-128\uff5e127short\u6574\u657016\u30d3\u30c3\u30c8-32,768\uff5e32,767int\u6574\u657032\u30d3\u30c3\u30c8-2,147,483,648\uff5e2,147,483,647long\u6574\u657064\u30d3\u30c3\u30c8-9,223,372,036,854,775,808\uff5e9,223,372,036,854,775,807charUnicode\u6587\u5b5716\u30d3\u30c3\u30c8\\u0000\uff5e\\uFFFFfloat\u6d6e\u52d5\u5c0f\u6570\u70b9\u657032\u30d3\u30c3\u30c8(\u7701\u7565)double\u6d6e\u52d5\u5c0f\u6570\u70b9\u657064\u30d3\u30c3\u30c8(\u7701\u7565)boolean-true, false<\/p>\n

\u8fd0\u7b97\u7b26<\/p>\n

\u7b97\u6570\u8fd0\u7b97\u7b26<\/p>\n
5<\/span> +<\/span> 2<\/span>;<\/span>      \/\/ 7 \u52a0\u7b97<\/span>\r\n5<\/span> -<\/span> 2<\/span>;<\/span>      \/\/ 3 \u6e1b\u7b97<\/span>\r\n5<\/span> *<\/span> 2<\/span>;<\/span>      \/\/ 10 \u4e57\u7b97<\/span>\r\n5<\/span> \/<\/span> 2<\/span>;<\/span>      \/\/ 2 \u9664\u7b97<\/span>\r\n5<\/span> %<\/span> 2<\/span>;<\/span>      \/\/ 1 \u5270\u4f59<\/span>\r\n\r\ny<\/span> =<\/span> ++<\/span>x<\/span>;<\/span>    \/\/ \u524d\u7f6e y = (x += 1);<\/span>\r\ny<\/span> =<\/span> x<\/span>++;<\/span>    \/\/ \u5f8c\u7f6e y = x; x = x + 1;<\/span>\r\n<\/code><\/pre>\n
\u6bd4\u8f03\u904b\u7b97\u7b26<\/p>\n
x<\/span> <<\/span> y<\/span>;<\/span>      \/\/ \u672a\u6e80<\/span>\r\nx<\/span> <=<\/span> y<\/span>;<\/span>     \/\/ \u4ee5\u4e0b<\/span>\r\nx<\/span> >=<\/span> y<\/span>;<\/span>     \/\/ \u4ee5\u4e0a<\/span>\r\nx<\/span> ><\/span> y<\/span>;<\/span>      \/\/ \u8d85\u904e<\/span>\r\nx<\/span> ==<\/span> y<\/span>;<\/span>     \/\/ \u540c\u5024<\/span>\r\nx<\/span> !=<\/span> y<\/span>;<\/span>     \/\/ \u540c\u5024\u3067\u306f\u306a\u3044<\/span>\r\n<\/code><\/pre>\n
\u5e03\u5c14\u8fd0\u7b97\u7b26<\/p>\n
x<\/span> &&<\/span> y<\/span>;<\/span>     \/\/ AND<\/span>\r\nx<\/span> ||<\/span> y<\/span>;<\/span>     \/\/ OR<\/span>\r\n!<\/span>x<\/span>;<\/span>         \/\/ NOT<\/span>\r\n<\/code><\/pre>\n
\u5b57\u7b26\u4e32<\/p>\n
String<\/span> str<\/span> =<\/span> \"\u6587\u5b57\u5217\"<\/span>;<\/span>           \/\/ \u521d\u671f\u5316<\/span>\r\n\r\nstr<\/span>.<\/span>length<\/span>();<\/span>                   \/\/ \u9577\u3055<\/span>\r\nstr<\/span>.<\/span>subString<\/span>(<\/span>start<\/span>,<\/span> end<\/span>);<\/span>      \/\/ start\u304b\u3089end-1\u306e\u5207\u308a\u53d6\u308a<\/span>\r\nstr1<\/span>.<\/span>eq<\/span>\u00ad<\/span>ual<\/span>\u00ad<\/span>s<\/span>(<\/span>str2<\/span>);<\/span>              \/\/ \u540c\u5024\u5224\u5b9a<\/span>\r\nstr1<\/span>.<\/span>co<\/span>\u00ad<\/span>mpa<\/span>\u00ad<\/span>reT<\/span>\u00ad<\/span>o<\/span>(<\/span>str2<\/span>);<\/span>           \/\/ \u6bd4\u8f03<\/span>\r\n\/\/ str1 < str2 -> -1<\/span>\r\n\/\/ str1 == str2 -> 0<\/span>\r\n\/\/ str1 > str2 -> 1<\/span>\r\n\r\nchar<\/span> c<\/span> =<\/span> str<\/span>.<\/span>charAt<\/span>(<\/span>i<\/span>);<\/span>             \/\/ String -> char i\u756a\u76ee\u306e\u6587\u5b57<\/span>\r\nchar<\/span>[]<\/span> cs<\/span> =<\/span> str<\/span>.<\/span>toCharArray<\/span>();<\/span>      \/\/ String -> char \u5168\u4f53<\/span>\r\n<\/code><\/pre>\n
\u6570\u636e\u8f6c\u6362<\/p>\n
int<\/span> i<\/span> =<\/span> Intege<\/span>\u00ad<\/span>r<\/span>.<\/span>p<\/span>\u00ad<\/span>ars<\/span>\u00ad<\/span>eIn<\/span>\u00ad<\/span>t<\/span>(<\/span>\u00ad<\/span>str<\/span>);<\/span>        \/\/ int <- String<\/span>\r\nint<\/span> i<\/span> =<\/span> (<\/span>int<\/span>)<\/span> d<\/span>;<\/span>                      \/\/ int <- double<\/span>\r\n\r\ndouble<\/span> d<\/span> =<\/span> Double<\/span>.<\/span>pa<\/span>\u00ad<\/span>rse<\/span>\u00ad<\/span>Dou<\/span>\u00ad<\/span>ble<\/span>\u00ad<\/span>(<\/span>s<\/span>\u00ad<\/span>tr<\/span>);<\/span>   \/\/ double <- String<\/span>\r\ndouble<\/span> d<\/span> =<\/span> (<\/span>double<\/span>)<\/span> i<\/span>;<\/span>                \/\/ double <- int<\/span>\r\n\r\nString<\/span> s<\/span> =<\/span> String<\/span>.<\/span>va<\/span>\u00ad<\/span>lue<\/span>\u00ad<\/span>Of<\/span>(<\/span>\u00ad<\/span>i<\/span>);<\/span>         \/\/ String <- int<\/span>\r\nString<\/span> s<\/span> =<\/span> String<\/span>.<\/span>va<\/span>\u00ad<\/span>lue<\/span>\u00ad<\/span>Of<\/span>(<\/span>\u00ad<\/span>d<\/span>);<\/span>         \/\/ String <- double<\/span>\r\n<\/code><\/pre>\n
\u6570\u503c\u5904\u7406 \u6570\u5b66<\/p>\n
Math<\/span>.<\/span>max<\/span>(<\/span>2<\/span>,<\/span> 5<\/span>);<\/span>     \/\/ 5 \u5927\u304d\u3044\u65b9<\/span>\r\nMath<\/span>.<\/span>min<\/span>(<\/span>2<\/span>,<\/span> 5<\/span>);<\/span>     \/\/ 2 \u5c0f\u3055\u3044\u65b9<\/span>\r\nMath<\/span>.<\/span>abs<\/span>(-<\/span>3<\/span>);<\/span>       \/\/ 3 \u7d76\u5bfe\u5024<\/span>\r\n\r\nMath<\/span>.<\/span>ceil<\/span>(<\/span>1.5<\/span>);<\/span>     \/\/ 2.0 \u5207\u308a\u4e0a\u3052<\/span>\r\nMath<\/span>.<\/span>floor<\/span>(<\/span>1.5<\/span>);<\/span>    \/\/ 1.0 \u5207\u308a\u6368\u3066<\/span>\r\nMath<\/span>.<\/span>round<\/span>(<\/span>1.5<\/span>);<\/span>    \/\/ 2.0 \u56db\u6368\u4e94\u5165 <\/span>\r\n\r\nMath<\/span>.<\/span>pow<\/span>(<\/span>2<\/span>,<\/span> 10<\/span>);<\/span>    \/\/ 1024 \u7d2f\u4e57<\/span>\r\nMath<\/span>.<\/span>sqrt<\/span>(<\/span>2<\/span>);<\/span>       \/\/ 1.414\u2026 \u5e73\u65b9\u6839<\/span>\r\nMath<\/span>.<\/span>log10<\/span>(<\/span>1000<\/span>);<\/span>   \/\/ 3 \u5e38\u7528\u5bfe\u6570<\/span>\r\n\r\nMath<\/span>.<\/span>PI<\/span>             \/\/ \u03c0 \u5186\u5468\u7387<\/span>\r\nMath<\/span>.<\/span>E<\/span>              \/\/ e \u81ea\u7136\u5bfe\u6570\u306e\u5e95<\/span>\r\n<\/code><\/pre>\n
\u6587\u672c\u683c\u5f0f\u5316\u5668\u4e5f\u8bb8\u8fc7\u4e00\u6bb5\u65f6\u95f4\u6211\u4f1a\u5199\u3002<\/p>\n
\u63a7\u5236\u8a9e\u53e5<\/p>\n
\u5982\u679c<\/p>\n
if<\/span> (<\/span> i<\/span> ><\/span> 0<\/span> )<\/span> {<\/span>\r\n \u00ad<\/span> ;<\/span>\r\n}<\/span> else<\/span> if<\/span> (<\/span> i<\/span> <<\/span> 0<\/span> )<\/span> {<\/span>\r\n \u00ad<\/span> \u00ad<\/span>;<\/span>\r\n}<\/span> else<\/span> {<\/span>\r\n \u00ad<\/span> \u00ad<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5bf9\u4e8e\/\u5bf9\u4e8e\u6bcf\u4e00\u4e2a<\/p>\n
for<\/span> (<\/span> int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> max<\/span>;<\/span> i<\/span>++<\/span> )<\/span> {<\/span>\r\n \u00ad<\/span> \u00ad<\/span>;<\/span>\r\n}<\/span>\r\n\r\nfor<\/span> (<\/span> var<\/span> :<\/span> colle<\/span>\u00ad<\/span>ction<\/span> )<\/span> {<\/span>\r\n \u00ad<\/span> \u00ad<\/span>;<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
\u5f53 \/ \u5faa\u73af<\/p>\n
while<\/span> (<\/span> i<\/span> ><\/span> 0<\/span> )<\/span> {<\/span>\r\n \u00ad<\/span> \u00ad<\/span>;<\/span>\r\n}<\/span>\r\n\r\ndo<\/span> {<\/span>\r\n \u00ad<\/span> \u00ad<\/span>;<\/span>\r\n}<\/span> while<\/span> (<\/span> i<\/span> ><\/span> 0<\/span> );<\/span>\r\n<\/code><\/pre>\n
\u8f6c\u6362
\n\u4ea4\u6362
\n\u53d8\u6362
\n\u5207\u6362
\n\u6539\u53d8
\n\u8f6c\u53d8<\/p>\n
switch<\/span> (<\/span> i<\/span> )<\/span> {<\/span>\r\n \u00ad<\/span> case<\/span> 0<\/span>:<\/span>\r\n \u00ad<\/span> \u00ad<\/span> \u00ad<\/span> \u00ad<\/span>;<\/span>\r\n \u00ad<\/span> \u00ad<\/span> \u00ad<\/span> \u00ad<\/span>break<\/span>;<\/span>\r\n \u00ad<\/span> case<\/span> 1<\/span>:<\/span>\r\n \u00ad<\/span> \u00ad<\/span> \u00ad<\/span> \u00ad<\/span>;<\/span>\r\n \u00ad<\/span> \u00ad<\/span> \u00ad<\/span> \u00ad<\/span>break<\/span>;<\/span>\r\n \u00ad<\/span> \u00ad<\/span>def<\/span>\u00ad<\/span>ault:<\/span>\r\n \u00ad<\/span> \u00ad<\/span> \u00ad<\/span> \u00ad<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6570\u7ec4<\/p>\n
\u4e00\u7ef4\u6570\u7ec4<\/p>\n
\/\/ \u521d\u671f\u5316<\/span>\r\nint<\/span>[]<\/span> num<\/span> =<\/span> new<\/span> int<\/span>[<\/span>10<\/span>];<\/span>\r\nArrays<\/span>.<\/span>fill<\/span>(<\/span>num<\/span>,<\/span> 0<\/span>);<\/span>\r\n\r\n\/\/ \u30c7\u30a3\u30fc\u30d7\u30b3\u30d4\u30fc deep copy<\/span>\r\nString<\/span>[]<\/span> copySrc<\/span> =<\/span> new<\/span> String<\/span>[<\/span>10<\/span>];<\/span>  \/\/ \u30b3\u30d4\u30fc\u5143<\/span>\r\nString<\/span>[]<\/span> copyDst<\/span> =<\/span> new<\/span> String<\/span>[<\/span>10<\/span>];<\/span>  \/\/ \u30b3\u30d4\u30fc\u5148<\/span>\r\ncopyDst<\/span> =<\/span> Arrays<\/span>.<\/span>copyOf<\/span>(<\/span>copySrc<\/span>,<\/span> copySrc<\/span>.<\/span>length<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u591a\u7ef4\u6570\u7ec4<\/p>\n
\/\/ \u521d\u671f\u5316<\/span>\r\nint<\/span>[][]<\/span> num<\/span> =<\/span> new<\/span> int<\/span>[<\/span>10<\/span>][<\/span>10<\/span>];<\/span>\r\nfor<\/span> (<\/span>int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> num<\/span>.<\/span>length<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n    Arrays<\/span>.<\/span>fill<\/span>(<\/span>num<\/span>[<\/span>i<\/span>],<\/span> 0<\/span>);<\/span>\r\n}<\/span>\r\n\r\n\/\/ \u30c7\u30a3\u30fc\u30d7\u30b3\u30d4\u30fc<\/span>\r\nString<\/span>[][]<\/span> copySrc<\/span> =<\/span> new<\/span> String<\/span>[<\/span>10<\/span>][<\/span>10<\/span>];<\/span>    \/\/ \u30b3\u30d4\u30fc\u5143<\/span>\r\nString<\/span>[][]<\/span> copyDst<\/span> =<\/span> new<\/span> String<\/span>[<\/span>10<\/span>][<\/span>10<\/span>];<\/span>    \/\/ \u30b3\u30d4\u30fc\u5148<\/span>\r\nfor<\/span> (<\/span>int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> copySrc<\/span>.<\/span>length<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n    copyDst<\/span>[<\/span>i<\/span>]<\/span> =<\/span> Arrays<\/span>.<\/span>copyOf<\/span>(<\/span>copySrc<\/span>[<\/span>i<\/span>],<\/span> copySrc<\/span>[<\/span>i<\/span>].<\/span>length<\/span>);<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
ArrayList \u5217\u8868<\/p>\n
\/\/ \u521d\u671f\u5316<\/span>\r\nList<\/span><<\/span>String<\/span>><\/span> list<\/span> =<\/span> new<\/span> ArrayList<\/span><<\/span>String<\/span>>();<\/span>\r\n\r\n\/\/ \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u3088\u308b\u64cd\u4f5c<\/span>\r\nlist<\/span>.<\/span>add<\/span>(<\/span>str<\/span>);<\/span>      \/\/ \u8ffd\u52a0<\/span>\r\nlist<\/span>.<\/span>remove<\/span>(<\/span>str<\/span>);<\/span>   \/\/ \u524a\u9664<\/span>\r\nlist<\/span>.<\/span>indexOf<\/span>(<\/span>str<\/span>);<\/span>  \/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u53d6\u5f97<\/span>\r\nlist<\/span>.<\/span>contains<\/span>(<\/span>str<\/span>);<\/span> \/\/ \u5b58\u5728\u30c1\u30a7\u30c3\u30af<\/span>\r\n\r\n\/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u3088\u308b\u64cd\u4f5c<\/span>\r\nlist<\/span>.<\/span>get<\/span>(<\/span>i<\/span>);<\/span>        \/\/ i\u756a\u76ee\u3092\u53d6\u5f97<\/span>\r\nlist<\/span>.<\/span>set<\/span>(<\/span>i<\/span>,<\/span> str<\/span>);<\/span>   \/\/ i\u756a\u76ee\u3092\u7f6e\u63db<\/span>\r\n<\/code><\/pre>\n
\u54c8\u5e0c\u6620\u5c04 \u54c8\u5e0c\u6620\u5c04<\/p>\n
\/\/ \u521d\u671f\u5316<\/span>\r\n\/\/ key -> int<\/span>\r\n\/\/ value -> String<\/span>\r\nHashMa<\/span>\u00ad<\/span>p<\/span><<\/span>Integer<\/span>,<\/span> St<\/span>\u00ad<\/span>rin<\/span>\u00ad<\/span>g<\/span>><\/span> hMap<\/span> =<\/span>\u00ad<\/span> new<\/span> HashMa<\/span>\u00ad<\/span>p<\/span><<\/span>Integer<\/span>,<\/span> String<\/span>\u00ad<\/span>>();<\/span>\r\n\r\nhMap<\/span>.<\/span>pu<\/span>\u00ad<\/span>t<\/span>(<\/span>\u00ad<\/span>i<\/span>\u00ad<\/span>,<\/span> \u00ad<\/span>str<\/span>);<\/span>       \/\/ \u8ffd\u52a0<\/span>\r\nhMap<\/span>.<\/span>ge<\/span>\u00ad<\/span>t<\/span>(<\/span>\u00ad<\/span>i<\/span>);<\/span>            \/\/ \u53d6\u5f97<\/span>\r\nhMap<\/span>.<\/span>co<\/span>\u00ad<\/span>nta<\/span>\u00ad<\/span>ins<\/span>\u00ad<\/span>Key<\/span>\u00ad<\/span>(<\/span>i<\/span>);<\/span>    \/\/ \u5b58\u5728\u30c1\u30a7\u30c3\u30af<\/span>\r\n<\/code><\/pre>\n
\u4f18\u5148\u7ea7\u961f\u5217\u4f18\u5148\u5ea6 PriorityQueue<\/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","protected":false},"excerpt":{"rendered":"
\u4e3a\u4e86\u4ec0\u4e48\u800c\u52aa\u529b\u8fbe\u5230\u7684\u76ee\u6807\u3002\u4eba\u4eec\u4f1a\u5fd8\u8bb0\u4e8b\u7269\u3002 \u5982\u679c\u7528\u5404\u79cd\u8bed\u8a00\u5199\u4e0b\u6765\uff0c\u53ef\u80fd\u4f1a\u66f4\u52a0\u663e\u8457\u3002 \u5728\u5199\u4e4b\u524d\u6d4f\u89c8\u4e00\u4e0b\u53ef\u80fd\u4f1a\u66f4\u987a […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31220","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"\nJava \u5feb\u901f\u53c2\u8003\u6307\u5357 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8eJava \u5feb\u901f\u53c2\u8003\u6307\u5357\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-\u5feb\u901f\u53c2\u8003\u6307\u5357\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java \u5feb\u901f\u53c2\u8003\u6307\u5357\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8eJava \u5feb\u901f\u53c2\u8003\u6307\u5357\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java-\u5feb\u901f\u53c2\u8003\u6307\u5357\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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