{"id":10006920,"date":"2022-11-27T17:28:46","date_gmt":"2022-11-27T09:28:46","guid":{"rendered":"https:\/\/ityet.com\/?p=10006920"},"modified":"2022-11-27T17:28:46","modified_gmt":"2022-11-27T09:28:46","slug":"java-%e5%ad%97%e7%ac%a6%e4%b8%b2-split-%e7%9a%84%e4%b8%80%e4%b8%aa%e5%8f%8d%e7%9b%b4%e8%a7%89%e9%99%b7%e9%98%b1","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006920","title":{"rendered":"Java \u5b57\u7b26\u4e32 split \u7684\u4e00\u4e2a\u53cd\u76f4\u89c9\u9677\u9631"},"content":{"rendered":"

\u6700\u8fd1\u751f\u4ea7\u73af\u5883\u9047\u5230\u4e00\u4e2a\u5947\u602a\u7684\u6570\u7ec4\u4e0b\u6807\u8d8a\u754c\u62a5\u9519\uff0c\u5982\u4e0b\u56fe\u4ee3\u7801\u6240\u793a\uff0c\u6211\u4eec\u53ef\u4ee5\u80af\u5b9a\u7684\u662f fieldName<\/code> \u53d8\u91cf\u4e0d\u4e3a\u7a7a\uff08\u4e0d\u662f\u7a7a\u5b57\u7b26\u4e32\uff0c\u4e5f\u4e0d\u662f null<\/code>\uff09\uff0c\u4f46\u662f\u4ee3\u7801\u6267\u884c\u5230\u8bfb\u53d6 names[0]<\/code> \u53d8\u91cf\u7684\u65f6\u5019\uff0c\u629b\u51fa\u4e86\u4e00\u4e2a \u6570\u7ec4\u4e0b\u6807\u8d8a\u754c<\/strong> \uff08java.lang.ArrayIndexOutOfBoundsException<\/code>\uff09 \u7684\u5f02\u5e38\u3002<\/p>\n

\"\"<\/p>\n

\u5f02\u5e38\u4fe1\u606f\u5982\u4e0b\u56fe\u6240\u793a<\/p>\n

\"\"<\/p>\n

\u95ee\u9898\u5f88\u7b80\u5355\uff0c\u6211\u4eec\u5bf9\u4e00\u4e2a\u5b57\u7b26\u4e32\u6267\u884c split<\/code> \u65b9\u6cd5\u4e4b\u540e\uff0c\u4ee5\u8fc7\u5f80\u5176\u5b83\u7f16\u7a0b\u8bed\u8a00\uff08Go\u3001PHP\u3001Javascript\u3001Dart \u7b49\uff09\u7684\u4f7f\u7528\u7ecf\u9a8c\u6765\u770b\uff0c\u5373\u4f7f\u5b57\u7b26\u4e32\u4e3a\u7a7a\uff0c\u5373\u4f7f\u6ca1\u6709\u5339\u914d\u5230\u5206\u9694\u7b26\uff0c\u5728\u8fd4\u56de\u503c\u6570\u7ec4\u4e2d\u4e5f\u4f1a\u5305\u542b\u4e00\u4e2a\u5f53\u524d\u5b57\u7b26\u4e32\u7684\u503c\u3002\u4f46\u662f\u8fd9\u91cc\u5374\u629b\u51fa\u4e86 ArrayIndexOutOfBoundsException<\/code>\uff0c\u96be\u9053 split<\/code> \u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u53ef\u80fd\u4e3a\u7a7a\u6570\u7ec4\uff1f<\/p>\n

\u6700\u7ec8\u7ecf\u8fc7\u6392\u67e5\u53d1\u73b0\uff0c\u5728\u4e0a\u8ff0\u4ee3\u7801\u6bb5\u4e2d\uff0c\u5f53 fieldName<\/code> \u7684\u503c\u4e3a "~"<\/code> \u7684\u65f6\u5019\uff0c\u6211\u4eec\u8bbf\u95ee names[0]<\/code> \u5c31\u4f1a\u629b\u51fa ArrayIndexOutOfBoundsException<\/code>\uff0c\u4e3a\u4ec0\u4e48\u4f1a\u8fd9\u6837\u5462\uff1f<\/p>\n

\u672c\u6587\u5c06\u4f1a\u6301\u7eed\u4fee\u6b63\u548c\u66f4\u65b0\uff0c\u6700\u65b0\u5185\u5bb9\u8bf7\u53c2\u8003\u6211\u7684 GITHUB<\/a> \u4e0a\u7684 \u7a0b\u5e8f\u733f\u6210\u957f\u8ba1\u5212<\/a> \u9879\u76ee\uff0c\u6b22\u8fce Star\uff0c\u66f4\u591a\u7cbe\u5f69\u5185\u5bb9\u8bf7 follow me<\/a>\u3002<\/p>\n

\u95ee\u9898<\/h2>\n

\u5728 Java \u4e2d\uff0c\u5982\u679c\u6267\u884c\u4e0b\u9762\u8fd9\u6bb5\u4ee3\u7801\uff0c\u76f4\u89c9\u4e0a\u4f60\u8ba4\u4e3a\u4f1a\u8f93\u51fa\u4ec0\u4e48\uff1f<\/p>\n

String str = "~";\nString []arr = str.split("~");\n\nSystem.out.println(arr.length);<\/code><\/pre>\n
\u5982\u679c\u4f60\u6709\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u7684\u7ecf\u9a8c\uff0c\u53ef\u80fd\u76f4\u89c9\u4e0a\u4f1a\u89c9\u5f97\u8fd9\u91cc\u8f93\u51fa\u7684\u5e94\u8be5\u662f 2<\/strong>\uff0c\u4f46\u662f\u9057\u61be\u7684\u662f\uff0c\u8fd9\u91cc\u8f93\u51fa\u7684\u662f 0<\/strong>\uff0c\u53d8\u91cf arr<\/code> \u662f\u4e2a\u7a7a\u6570\u7ec4\u3002<\/p>\n
\u8fd9\u91cc\u4e0d\u7981\u6000\u7591\u81ea\u5df1\u4e4b\u524d\u7684\u8bb0\u5fc6\u662f\u4e0d\u662f\u6709\u504f\u5dee\uff0c\u4e8e\u662f\u6211\u53c8\u4f7f\u7528\u5176\u5b83\u8bed\u8a00\u6765\u5c1d\u8bd5\u590d\u73b0\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n
\u4e0d\u540c\u8bed\u8a00\u4e2d split \u7684\u884c\u4e3a<\/h2>\n
\u6211\u603b\u7ed3\u4e86\u4e00\u4e2a\u8868\u683c\uff0c\u8bf4\u660e\u4e86\u4e0d\u7528\u8bed\u8a00\u4e0d\u540c\u7684\u884c\u4e3a\uff0c\u8fd9\u91cc\u5bf9\u6bd4\u7684\u662f\u6267\u884c split<\/code> \u51fd\u6570\/\u65b9\u6cd5\u540e\u8fd4\u56de\u6570\u7ec4\u7684\u957f\u5ea6\uff1a<\/p>\n\n\n\n\n\n\n\n\n\n\n
\u8bed\u8a00\/\u51fd\u6570<\/th>\n"".split("")<\/code><\/th>\n"~".split("~")<\/code><\/th>\n"~~".split("~")<\/code><\/th>\n"".split("~")<\/code><\/th>\n"~123".split("~")<\/code><\/th>\n<\/tr>\n<\/thead>\n
Javascript<\/td>\n0<\/td>\n2<\/td>\n3<\/td>\n1<\/td>\n2<\/td>\n<\/tr>\n
PHP<\/td>\n0<\/td>\n2<\/td>\n3<\/td>\n1<\/td>\n2<\/td>\n<\/tr>\n
Dart<\/td>\n0<\/td>\n2<\/td>\n3<\/td>\n1<\/td>\n2<\/td>\n<\/tr>\n
Golang<\/td>\n0<\/td>\n2<\/td>\n3<\/td>\n1<\/td>\n2<\/td>\n<\/tr>\n
Scala<\/td>\n1<\/td>\n0<\/td>\n0<\/td>\n1<\/td>\n2<\/td>\n<\/tr>\n
Java<\/td>\n1<\/td>\n0<\/td>\n0<\/td>\n1<\/td>\n2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Javascript<\/h3>\n
\u9996\u5148\u662f Javascript\uff0c\u5728\u6d4f\u89c8\u5668\u7684\u63a7\u5236\u53f0\u4e0a\u76f4\u63a5\u6267\u884c\uff0c\u5f97\u5230\u4e86\u4e0b\u9762\u7684\u7ed3\u679c<\/p>\n
"".split("")\n"~".split("~")\n"~~".split("~")\n"".split("~")\n"~123".split("~")<\/code><\/pre>\n
\u6267\u884c\u7ed3\u679c<\/p>\n
\"\"<\/p>\n
\u8ddf\u6211\u7684\u76f4\u89c9\u662f\u4e00\u81f4\u7684\uff0c\u540c\u6837\u7684\u60c5\u51b5\uff0c\u8fd9\u91cc\u8fd4\u56de\u7684\u662f 2<\/strong>\u3002<\/p>\n
PHP<\/h3>\n
\u5728 PHP \u4e2d\uff0c\u6211\u4f7f\u7528\u4e86 mb_split<\/code> \u51fd\u6570\uff0c\u8be5\u51fd\u6570\u7528\u4e8e\u5bf9\u591a\u5b57\u8282\u5b57\u7b26\u4e32\u8fdb\u884c\u5206\u5272<\/p>\n
\"\"<\/p>\n
\u6267\u884c\u7ed3\u679c\u5982\u4e0b<\/p>\n
\"\"<\/p>\n
\u6267\u884c\u7ed3\u679c\u8ddf\u6211\u7684\u76f4\u89c9\u4e5f\u662f\u4e00\u81f4\u7684\uff0c\u540c\u6837\u7684\u60c5\u51b5\uff0c\u8fd9\u91cc\u8fd4\u56de\u7684\u662f 2<\/strong>\u3002<\/p>\n
Dart<\/h3>\n
\u7136\u540e\u662f Google \u7684 Dart\uff0c\u8fd9\u662f\u4e00\u95e8\u4e3b\u8981\u7528\u4e8e\u4f7f\u7528 Flutter \u6765\u5f00\u53d1\u8de8\u5e73\u53f0\u5e94\u7528\u7684\u7f16\u7a0b\u8bed\u8a00\uff0c\u4ee3\u7801\u5982\u4e0b<\/p>\n
void main() {\n    print("".split('').length); \/\/ 0\n    print("~".split('~').length); \/\/ 2\n    print("~~".split('~').length); \/\/ 3\n    print("".split('~').length); \/\/ 1\n    print("~123".split('~').length); \/\/ 2\n}<\/code><\/pre>\n
\u6267\u884c\u7ed3\u679c<\/p>\n
\"\"<\/p>\n
\u540c\u6837\uff0c"~".split("~")<\/code> \u4e5f\u662f\u8fd4\u56de\u4e86\u4e24\u4e2a\u503c\u3002<\/p>\n
Golang<\/h3>\n
\u5728 Golang \u4e2d\uff0c\u6267\u884c\u7ed3\u679c\u4f9d\u65e7\u662f\u7b26\u5408\u76f4\u89c9\u7684\uff0c\u8fd4\u56de\u7684\u662f 2<\/strong>\u3002<\/p>\n
package main\n\nimport(\n    "strings"\n    "fmt"\n)\n\nfunc main() {\n    printStrs(strings.Split("", "")) \/\/ 0 []\n    printStrs(strings.Split("~", "~")) \/\/ 2 ["", "", ]\n    printStrs(strings.Split("~~", "~")) \/\/ 3 ["", "", "", ]\n    printStrs(strings.Split("", "~")) \/\/ 1 ["", ]\n    printStrs(strings.Split("~123", "~")) \/\/ 2 ["", "123", ]\n}\n\nfunc printStrs(s []string) {\n    fmt.Print(len(s), " [")\n    for _, item := range s {\n        fmt.Printf(`"%s", `, item)\n    }\n\n    fmt.Print("]\/n")\n}<\/code><\/pre>\n
\u6267\u884c\u7ed3\u679c<\/p>\n
\"\"<\/p>\n
Scala<\/h3>\n
\u7136\u540e\uff0c\u6211\u53c8\u5c1d\u8bd5\u4e86 Scala\uff0c\u53d1\u73b0\u5728 Scala \u4e2d\uff0c split<\/code> \u7684\u884c\u4e3a\u6709\u4e9b\u4e0d\u4e00\u6837\u4e86\u3002<\/p>\n
"".split("").length\n"~".split("~").length\n"~~".split("~").length\n"".split("~").length\n"~123".split("~").length<\/code><\/pre>\n
\"\"<\/p>\n
\u4ee3\u7801 "~".split("~")<\/code> \u8fd4\u56de\u7684\u662f \u7a7a\u6570\u7ec4<\/strong>\uff0c\u4e0e\u5728 Java \u4e2d\u6211\u4eec\u9047\u5230\u7684\u95ee\u9898\u5982\u51fa\u4e00\u8f99\u3002<\/p>\n
Java<\/h3>\n
\u6700\u540e\uff0c\u6211\u53c8\u7528 Java \u6267\u884c\u4e86\u540c\u6837\u7684\u4ee3\u7801<\/p>\n
package example;\nimport org.junit.Test;\n\npublic class ExampleTest {\n  @Test\n  public void testSplit() {\n    printStrings("".split("")); \/\/ 1 ["", ]\n    printStrings("~".split("~")); \/\/ 0 []\n    printStrings("~~".split("~")); \/\/ 0 []\n    printStrings("".split("~")); \/\/ 1 ["", ]\n    printStrings("~123".split("~")); \/\/ 2 ["", "123", ]\n  }\n  \n  private void printStrings(String[] strings) {\n    System.out.print(strings.length + " [");\n    for (String str : strings) {\n      System.out.printf("\/"%s\/", ", str);\n    }\n    System.out.println("]");\n  }\n}<\/code><\/pre>\n
\u6267\u884c\u7ed3\u679c<\/p>\n
\"\"<\/p>\n
\u7ed3\u679c\u4e0e Scala \u662f\u4e00\u81f4\u7684\uff0c\u540c\u65f6\u4e5f\u89e3\u91ca\u4e86\u4e3a\u4ec0\u4e48\u6211\u4eec\u4f1a\u9047\u5230 ArrayIndexOutOfBoundsException<\/code> \u7684\u95ee\u9898\u3002<\/p>\n
\u539f\u56e0<\/h2>\n
\u7ffb\u9605\u4e86 Java \u7684 API \u6587\u6863\uff0c\u53d1\u73b0\u539f\u6765 Java \u4e2d\u7684 split<\/code> \u65b9\u6cd5\u786e\u5b9e\u8ddf\u5176\u5b83\u8bed\u8a00\u662f\u4e0d\u4e00\u6837\u7684\uff0c\u8fd9\u4e00\u70b9\u6211\u4eec\u7279\u522b\u5bb9\u6613\u5ffd\u7565<\/p>\n
\"\"<\/p>\n
\u5982\u679c\u5206\u9694\u7b26\u8868\u8fbe\u5f0f\u4e0e\u5b57\u7b26\u4e32\u4e0d\u5339\u914d\uff0c\u5219\u8fd4\u56de\u539f\u59cb\u5b57\u7b26\u4e32\u4f5c\u4e3a\u6570\u7ec4\u7684\u552f\u4e00\u503c\uff0c\u8fd9\u4e5f\u5c31\u89e3\u91ca\u4e86<\/p>\n
"".split("") \/\/ 1 [""]\n"".split("~") \/\/ 1 [""]<\/code><\/pre>\n
\u5982\u679c\u5206\u9694\u7b26\u8868\u5355\u5f0f\u4e0e\u5b57\u7b26\u4e32\u7684\u5f00\u59cb\u5b57\u7b26\u5c31\u5df2\u7ecf\u5339\u914d\u4e86\uff0c\u5219\u8fd4\u56de\u503c\u4e2d\u7b2c\u4e00\u4e2a\u5143\u7d20\u4f1a\u88ab\u8bbe\u7f6e\u4e3a ""<\/code><\/p>\n
"~123".split("~") \/\/ 2 ["", "123"]<\/code><\/pre>\n
\u5982\u679c limit<\/code> \u53c2\u6570\u4e3a 0<\/strong>\uff0c\u4e5f\u5c31\u662f split(String regex)<\/code> \u65b9\u6cd5\uff0c\u5219\u5339\u914d\u7ed3\u679c\u672b\u5c3e\u7684\u6240\u6709\u7a7a\u5b57\u7b26\u4e32 ""<\/code> \u90fd\u4f1a\u88ab\u4e22\u5f03\uff0c\u4e5f\u5c31\u89e3\u91ca\u4e86\u4e0b\u9762\u4e24\u6bb5\u4ee3\u7801<\/p>\n
"~".split("~") \/\/ 0 []\n"~~".split("~") \/\/ 0 []<\/code><\/pre>\n
\"\"<\/p>\n
\u7136\u540e\u6211\u53c8\u7ffb\u9605\u4e86 Scala \u7684\u5b98\u65b9\u6587\u6863\uff0cScala \u548c Java \u7684\u884c\u4e3a\u662f\u4e00\u81f4\u7684\u3002<\/p>\n
\"\"<\/p>\n
\u603b\u7ed3<\/h2>\n
\u5728 Java \u4e2d\u4f7f\u7528\u5b57\u7b26\u4e32\u7684 split<\/code> \u65b9\u6cd5\uff0c\u4e00\u822c\u60c5\u51b5\u4e0b\u7684\u884c\u4e3a\u662f\u548c\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u662f\u4e00\u81f4\u7684\uff0c\u4f46\u5728\u4e00\u4e9b\u8fb9\u754c\u6761\u4ef6\u4e0b\uff0c\u4e5f\u6709\u4e00\u4e9b\u4e0d\u4e00\u81f4\u7684\u5730\u65b9\uff0c\u8fd9\u4e00\u70b9\u662f\u6211\u4eec\u5e94\u8be5\u6ce8\u610f\u7684\uff0c\u8fd9\u4e5f\u63d0\u9192\u4e86\u6211\u4eec\uff0c\u4e0d\u8981\u60f3\u5f53\u7136\u7684\u8ba4\u4e3a\u4e0d\u540c\u8bed\u8a00\uff0c\u540c\u540d\u51fd\u6570\uff08\u65b9\u6cd5\uff09\u7684\u529f\u80fd\u662f\u5b8c\u5168\u4e00\u81f4\u7684\uff0c\u5f53\u6211\u4eec\u9047\u5230\u4e00\u4e9b\u5947\u5947\u602a\u602a\u7684\u95ee\u9898\u65f6\uff0c\u591a\u770b\u5b98\u65b9\u6587\u6863\u624d\u662f\u786c\u9053\u7406\u3002<\/p>\n
\u672c\u6587\u5c06\u4f1a\u6301\u7eed\u4fee\u6b63\u548c\u66f4\u65b0\uff0c\u6700\u65b0\u5185\u5bb9\u8bf7\u53c2\u8003\u6211\u7684 GITHUB<\/a> \u4e0a\u7684 \u7a0b\u5e8f\u733f\u6210\u957f\u8ba1\u5212<\/a> \u9879\u76ee\uff0c\u6b22\u8fce Star\uff0c\u66f4\u591a\u7cbe\u5f69\u5185\u5bb9\u8bf7 follow me<\/a>\u3002<\/p>\n
https:\/\/segmentfault.com\/a\/1190000042912343<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u6700\u8fd1\u751f\u4ea7\u73af\u5883\u9047\u5230\u4e00\u4e2a\u5947\u602a\u7684\u6570\u7ec4\u4e0b\u6807\u8d8a\u754c\u62a5\u9519\uff0c\u5982\u4e0b\u56fe\u4ee3\u7801\u6240\u793a\uff0c\u6211\u4eec\u53ef\u4ee5\u80af\u5b9a\u7684\u662f fieldName \u53d8\u91cf\u4e0d\u4e3a\u7a7a\uff08 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10006920","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006920","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10006920"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006920\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10006920"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10006920"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10006920"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}