{"id":15971,"date":"2017-02-25T14:54:33","date_gmt":"2017-02-25T05:54:33","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=15971"},"modified":"2024-05-06T11:40:32","modified_gmt":"2024-05-06T02:40:32","slug":"%e3%80%903%e5%88%86%e3%81%a7java%e5%85%a5%e9%96%80%e3%80%91list%e3%81%aeindexof%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%82%92%e3%82%8f%e3%81%8b%e3%82%8a%e3%82%84%e3%81%99%e3%81%8f%e8%a7%a3%e8%aa%ac","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/15971","title":{"rendered":"\u3010Java\u5165\u9580\u3011indexOf\u3068lastIndexOf\u3067\u6587\u5b57\u5217\u3092\u691c\u7d22\u3059\u308b(List\/String)"},"content":{"rendered":"

\u3053\u3093\u306b\u3061\u306f\uff01\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u4e2d\u6ca2\u3067\u3059\u3002<\/p>\n

Java<\/a>\u306b\u306f\u6587\u5b57\u5217\u3092\u691c\u7d22\u3059\u308b\u305f\u3081\u306eindexOf\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<\/p>\n

\u30fbindexOf\u30e1\u30bd\u30c3\u30c9\u3068\u306f
\n\u30fbList\u306e\u4e2d\u306b\u7279\u5b9a\u306e\u5024(\u6587\u5b57\u5217)\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u77e5\u308a\u305f\u3044
\n\u30fbList\u306e\u4e2d\u306b\u7279\u5b9a\u306e\u5024(\u6587\u5b57\u5217)\u304c\u542b\u307e\u308c\u3066\u3044\u305f\u3089\u305d\u306e\u8981\u7d20\u756a\u53f7\u3092\u77e5\u308a\u305f\u3044<\/strong><\/span><\/p>\n

\u3068\u3044\u3046\u57fa\u672c\u7684\u306a\u5185\u5bb9\u304b\u3089\u3001<\/p>\n

\u30fbindexOf\u30e1\u30bd\u30c3\u30c9\u3067\u8907\u6570\u306e\u8981\u7d20\u3092\u691c\u7d22\u3059\u308b\u65b9\u6cd5
\n\u30fbString\u3068StringBuffer\u306e\u90e8\u5206\u6587\u5b57\u5217\u3092\u691c\u7d22\u3059\u308b\u65b9\u6cd5\u304c\u77e5\u308a\u305f\u3044
\n\u30fblastIndexOf\u30e1\u30bd\u30c3\u30c9\u3068indexOf\u30e1\u30bd\u30c3\u30c9\u306e\u9055\u3044\u304c\u4f55\u304b\u3092\u77e5\u308a\u305f\u3044
\n\u30fbcontains\u3068indexOf\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9(\u901f\u5ea6)\u306e\u6bd4\u8f03\u3092\u77e5\u308a\u305f\u3044<\/strong><\/span><\/p>\n

\u306a\u3069\u306e\u5fdc\u7528\u7684\u306a\u4f7f\u3044\u65b9\u306b\u95a2\u3057\u3066\u3082\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

\u4eca\u56de\u306f\u3053\u308c\u3089\u306e\u65b9\u6cd5\u3092\u899a\u3048\u308b\u305f\u3081\u306b\u3001indexOf\u30e1\u30bd\u30c3\u30c9\u306e\u3055\u307e\u3056\u307e\u306a\u4f7f\u3044\u65b9\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\uff01<\/strong><\/span><\/p>\n

\u306a\u304a\u3001Java\u306e\u8a18\u4e8b\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089<\/a>\u306b\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n

indexOf\u30e1\u30bd\u30c3\u30c9\u3068\u306f<\/h2>\n

\u6587\u5b57\u5217\u306b\u542b\u307e\u308c\u308b\u90e8\u5206\u6587\u5b57\u5217\u3092\u691c\u7d22\u3059\u308b\u306b\u306findexOf\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n

indexOf\u30e1\u30bd\u30c3\u30c9\u306f\u3001List\u306a\u3069\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3084\u3001String\u3001StringBuffer\u306a\u3069\u306b\u5bfe\u3057\u3066\u4f7f\u7528\u3057\u307e\u3059\u3002<\/strong><\/span><\/p>\n

indexOf\u30e1\u30bd\u30c3\u30c9\u306f\u6b21\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n

public int indexOf(String str [,int index])<\/pre>\n
\u3053\u308c\u3092\u5b9f\u969b\u306b\u4f7f\u3046\u3068\u304d\u306e\u3088\u3046\u306b\u308f\u304b\u308a\u3084\u3059\u304f\u8a18\u8ff0\u3059\u308b\u3068\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u6587\u5b57\u5217\u3084List.indexOf(\u691c\u7d22\u3057\u305f\u3044\u6587\u5b57\u5217, \u691c\u7d22\u3092\u958b\u59cb\u3059\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7(\u7701\u7565\u53ef\u80fd))<\/pre>\n
indesOf\u30e1\u30bd\u30c3\u30c9\u306f\u6307\u5b9a\u3057\u305f\u90e8\u5206\u6587\u5b57\u5217\u304c\u898b\u3064\u304b\u3063\u305f\u5834\u5408\u306f\u3001\u6587\u5b57\u5217\u306e\u5148\u982d\u3092\u201d0\u201d\u3068\u3057\u305f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u3067\u8fd4\u3057\u3001\u90e8\u5206\u6587\u5b57\u5217\u304c\u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\u5834\u5408\u306f\u201d-1\u201d\u3092\u8fd4\u3057\u307e\u3059\u3002<\/strong><\/span><\/p>\n
\u7b2c2\u5f15\u6570\u3067\u691c\u7d22\u958b\u59cb\u4f4d\u7f6e\u3092\u6307\u5b9a<\/strong><\/span>\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
indexOf\u30e1\u30bd\u30c3\u30c9\u306f\u5148\u982d\u304b\u3089\u691c\u7d22\u3057\u3066\u6700\u521d\u306b\u898b\u3064\u304b\u3063\u305f\u4f4d\u7f6e\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7\u3092\u8fd4\u3059\u306e\u3067\u3001\u5148\u982d\u4ee5\u5916\u306e\u4f4d\u7f6e\u3092\u691c\u7d22\u3057\u305f\u3044\u5834\u5408\u306b\u7b2c2\u5f15\u6570\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/strong><\/span><\/p>\n
\u5148\u982d\u304b\u3089\u691c\u7d22\u3059\u308b\u5834\u5408\u306b\u306f\u3001\u7b2c2\u5f15\u6570\u3092\u7701\u7565\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/strong><\/span><\/p>\n
indexOf\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9<\/h2>\n
List\u306e\u4e2d\u306b\u7279\u5b9a\u306e\u5024\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u8abf\u3079\u308b\u306b\u306f\u3001contains\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u304bindexOf\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u306e\u3069\u3061\u3089\u304b\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
contains\u30e1\u30bd\u30c3\u30c9\u306fList\u306e\u4e2d\u306b\u6307\u5b9a\u3057\u305f\u8981\u7d20\u304c\u3042\u308b\u5834\u5408\u306b”true”\u3092\u8fd4\u3057\u307e\u3059\u3002<\/strong><\/span><\/p>\n
indexOf\u30e1\u30bd\u30c3\u30c9\u306f\u6307\u5b9a\u3057\u305f\u8981\u7d20\u3092List\u306e\u5148\u982d\u304b\u3089\u691c\u7d22\u3057\u3066\u6700\u521d\u306b\u898b\u3064\u304b\u3063\u305f\u4f4d\u7f6e\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
\u305d\u306e\u305f\u3081\u3001<\/p>\n
\u30fbList\u5185\u306b\u7279\u5b9a\u306e\u8981\u7d20\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u5834\u5408\u306fcontains\u30e1\u30bd\u30c3\u30c9
\n\u30fb\u8981\u7d20\u756a\u53f7\u3092\u77e5\u308a\u305f\u3044\u5834\u5408\u306findexOf\u30e1\u30bd\u30c3\u30c9<\/strong><\/span><\/p>\n
\u3068\u899a\u3048\u307e\u3057\u3087\u3046\uff01<\/p>\n
contains\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u306f\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u305c\u3072\u78ba\u8a8d\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n            \n                
\n                
\n                    
\n                    \n                    <\/div>\n                    
\n                    
\u3010\u901f\u7fd2Java\u3011String\u306econtains\u3067\u6587\u5b57\u5217\u3092\u542b\u3080\u304b\u77e5\u308b\u65b9\u6cd5<\/div>\n                    
\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n
List\u3067indexOf<\/h3>\n
\u3053\u3053\u3067\u306f\u3001indexOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066List\u5185\u306b\u7279\u5b9a\u306e\u8981\u7d20\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u65b9\u6cd5<\/strong><\/span>\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n
contains\u30e1\u30bd\u30c3\u30c9\u3067\u5024\u304c\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u308b\u65b9\u6cd5<\/strong><\/span>\u3082\u540c\u6642\u306b\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u6b21\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
import java.util.ArrayList;\r\nimport java.util.Arrays;\r\nimport java.util.List;\r\n\r\npublic class Main {\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tList list = new ArrayList<>(Arrays.asList(\"s\", \"a\", \"m\", \"u\", \"r\", \"a\", \"i\"));\r\n\t\tboolean exists = list.contains(\"a\");\r\n\t\tint index = list.indexOf(\"a\");\r\n\r\n\t\tSystem.out.println(\"\u5b58\u5728\u3059\u308b\u304b\uff1f = \" + exists);\r\n\t\tSystem.out.println(\"\u8981\u7d20\u756a\u53f7 = \" + index);\r\n\t}\r\n}\r\n<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/p>\n
\u5b58\u5728\u3059\u308b\u304b\uff1f = true\r\n\u8981\u7d20\u756a\u53f7 = 1<\/pre>\n
\u3053\u306e\u3088\u3046\u306bcontains\u30e1\u30bd\u30c3\u30c9\u3068indexOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001List\u5185\u306e\u8981\u7d20\u306e\u78ba\u8a8d\u304c\u3067\u304d\u307e\u3057\u305f\uff01<\/p>\n
String\u3067indexOf<\/h3>\n
\u524d\u8ff0\u3057\u305f\u3088\u3046\u306bindexOf\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u5bfe\u8c61\u306e\u6587\u5b57\u5217\u304b\u3089\u6307\u5b9a\u3057\u305f\u90e8\u5206\u6587\u5b57\u5217\u3092\u691c\u7d22\u3057\u307e\u3059\u3002<\/p>\n
\u90e8\u5206\u6587\u5b57\u5217\u304c\u898b\u3064\u304b\u3063\u305f\u5834\u5408\u306f\u3001\u6587\u5b57\u5217\u306e\u5148\u982d\u30920\u3068\u3057\u305f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u756a\u53f7<\/strong><\/span>\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306bString\u578b\u306e\u6587\u5b57\u5217\u3092\u691c\u7d22\u3059\u308b\u65b9\u6cd5\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n\tpublic static void main(String[] args) {\r\n\t\tString str1 = \"appleorangemelon\";\r\n\t\tString str2 = \"orange\";\r\n\r\n\t\tint result = str1.indexOf(str2);\r\n\r\n\t\tif (result != -1) {\r\n\t\t\tSystem.out.println(str2 + \"\u304c\u898b\u3064\u304b\u3063\u305f\u4f4d\u7f6e\uff1a\" + result);\r\n\t\t} else {\r\n\t\t\tSystem.out.println(str2 + \"\u306f\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\");\r\n\t\t}\r\n\t}\r\n}<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/p>\n
orange\u304c\u898b\u3064\u304b\u3063\u305f\u4f4d\u7f6e\uff1a5<\/pre>\n
StringBuffer\u3067indexOf<\/h3>\n
StringBuffer\u30af\u30e9\u30b9\u3067\u6307\u5b9a\u3057\u305f\u6587\u5b57\u5217\u3067\u3082String\u3068\u540c\u69d8\u306bindexOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u90e8\u5206\u6587\u5b57\u5217\u3092\u691c\u7d22<\/strong><\/span>\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306bStringBuffer\u30af\u30e9\u30b9\u3067\u6307\u5b9a\u3057\u305f\u90e8\u5206\u6587\u5b57\u5217\u3092\u691c\u7d22\u3059\u308b\u65b9\u6cd5\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tStringBuffer sb = new StringBuffer();\r\n\t\tsb.append(\"appleorangemelon\");\r\n\t\tString str = \"orange\";\r\n\r\n\t\tint result = sb.indexOf(str);\r\n\r\n\t\tif (result != -1) {\r\n\t\t\tSystem.out.println(str + \"\u304c\u898b\u3064\u304b\u3063\u305f\u4f4d\u7f6e\uff1a\" + result);\r\n\t\t} else {\r\n\t\t\tSystem.out.println(str + \"\u306f\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\");\r\n\t\t}\r\n\t}\r\n}<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/p>\n
orange\u304c\u898b\u3064\u304b\u3063\u305f\u4f4d\u7f6e\uff1a5<\/pre>\n
StringBuffer\u30af\u30e9\u30b9\u306e\u6587\u5b57\u5217\u3082\u3001indexOf\u30e1\u30bd\u30c3\u30c9\u3067\u90e8\u5206\u6587\u5b57\u5217\u304c\u691c\u7d22\u3067\u304d\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u306d\uff01<\/p>\n
lastIndexOf\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9<\/h2>\n
\u3053\u3053\u3067\u306flastIndexOf\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9<\/strong><\/span>\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n
indexOf\u30e1\u30bd\u30c3\u30c9\u306fList\u306e\u5148\u982d\u304b\u3089\u691c\u7d22\u3057\u3066\u6700\u521d\u306b\u898b\u3064\u304b\u3063\u305f\u4f4d\u7f6e\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8fd4\u3057\u307e\u3059\u304c\u3001lastIndexOf\u30e1\u30bd\u30c3\u30c9\u306f\u6587\u5b57\u5217\u306e\u5f8c\u308d\u304b\u3089\u691c\u7d22\u3057\u3066\u6700\u521d\u306b\u898b\u3064\u304b\u3063\u305f\u4f4d\u7f6e\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8fd4\u3057\u307e\u3059\u3002<\/strong><\/span><\/p>\n
\u305d\u306e\u305f\u3081\u3001\u540c\u3058\u8981\u7d20\u304c\u8907\u6570\u5165\u3063\u3066\u3044\u308b\u5834\u5408\u306b\u306f\u4f7f\u3046\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u3063\u3066\u9055\u3046\u5024\u304c\u8fd4\u3063\u3066\u304d\u307e\u3059\uff01<\/strong><\/span><\/p>\n
List\u3067lastIndexOf<\/h3>\n
List\u5185\u306b\u7279\u5b9a\u306e\u8981\u7d20\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u65b9\u6cd5\u3092\u3001lastindexOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
import java.util.ArrayList;\r\nimport java.util.Arrays;\r\nimport java.util.List;\r\n\r\npublic class Main {\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tList list = new ArrayList<>(Arrays.asList(\"s\", \"a\", \"m\", \"u\", \"r\", \"a\", \"i\"));\r\n\t\tint index = list.indexOf(\"a\");\r\n\t\tint lastIndex = list.lastIndexOf(\"a\");\r\n\r\n\t\tSystem.out.println(\"\u6700\u521d\u306e\u8981\u7d20\u756a\u53f7 = \" + index);\r\n\t\tSystem.out.println(\"\u6700\u5f8c\u306e\u8981\u7d20\u756a\u53f7 = \" + lastIndex);\r\n\t}\r\n}<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/p>\n
\u6700\u521d\u306e\u8981\u7d20\u756a\u53f7 = 1\r\n\u6700\u5f8c\u306e\u8981\u7d20\u756a\u53f7 = 5<\/pre>\n
\u3053\u306e\u3088\u3046\u306b\u3001List\u306b\u540c\u3058\u8981\u7d20\u304c\u8907\u6570\u5165\u3063\u3066\u3044\u308b\u5834\u5408\u306b\u306findexOf\u30e1\u30bd\u30c3\u30c9\u3068lastIndexOf\u30e1\u30bd\u30c3\u30c9\u3067\u9055\u3046\u7d50\u679c\u306b\u306a\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3057\u305f\uff01<\/p>\n
String\u3067lastIndexOf<\/h3>\n
String\u578b\u306e\u6587\u5b57\u5217\u306blastindexOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u90e8\u5206\u6587\u5b57\u5217\u3092\u691c\u7d22\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u4ee5\u4e0b\u306bString\u578b\u306e\u6587\u5b57\u5217\u3092\u691c\u7d22\u3059\u308b\u65b9\u6cd5\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tString str1 = \"appleorangemelonorange\";\r\n\t\tString str2 = \"orange\";\r\n\r\n\t\tint result = str1.lastIndexOf(str2);\r\n\r\n\t\tif (result != -1) {\r\n\t\t\tSystem.out.println(str2 + \"\u304c\u898b\u3064\u304b\u3063\u305f\u4f4d\u7f6e\uff1a\" + result);\r\n\t\t} else {\r\n\r\n\t\t\tSystem.out.println(str2 + \"\u306f\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\");\r\n\t\t}\r\n\t}\r\n}<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/p>\n
orange\u304c\u898b\u3064\u304b\u3063\u305f\u4f4d\u7f6e\uff1a16<\/pre>\n
\u6307\u5b9a\u3057\u305f\u90e8\u5206\u6587\u5b57\u5217\u3067\u3042\u308borange\u306f\u6587\u5b57\u5217\u306b2\u3064\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u304c\u3001lastIndexOf\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001\u6587\u5b57\u5217\u306e\u672b\u5c3e\u304b\u3089\u691c\u7d22\u3057\u307e\u3059\u306e\u3067\u3001\u5f8c\u65b9\u306e2\u756a\u76ee\u306eorange\u306e\u4f4d\u7f6e\u3092\u8fd4\u3057\u307e\u3059\u3002<\/strong><\/span><\/p>\n
StringBuffer\u3067lastindexOf<\/h3>\n
StringBuffer\u30af\u30e9\u30b9\u3067\u6307\u5b9a\u3057\u305f\u6587\u5b57\u5217\u3067\u3082String\u3068\u540c\u69d8\u306blastIndexOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u90e8\u5206\u6587\u5b57\u5217\u3092\u691c\u7d22<\/strong><\/span>\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306bStringBuffer\u30af\u30e9\u30b9\u3067\u6307\u5b9a\u3057\u305f\u90e8\u5206\u6587\u5b57\u5217\u3092\u691c\u7d22\u3059\u308b\u65b9\u6cd5\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
public class Main {\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tStringBuffer sb = new StringBuffer();\r\n\t\tsb.append(\"appleorangemelonorange\");\r\n\t\tString str = \"orange\";\r\n\r\n\t\tint result = sb.lastIndexOf(str);\r\n\r\n\t\tif (result != -1) {\r\n\t\t\tSystem.out.println(str + \"\u304c\u898b\u3064\u304b\u3063\u305f\u4f4d\u7f6e\uff1a\" + result);\r\n\t\t} else {\r\n\t\t\tSystem.out.println(str + \"\u306f\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\");\r\n\t\t}\r\n\t}\r\n}<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/p>\n
orange\u304c\u898b\u3064\u304b\u3063\u305f\u4f4d\u7f6e\uff1a16<\/pre>\n
indexOf\u30e1\u30bd\u30c3\u30c9\u3067\u8907\u6570\u306e\u8981\u7d20\u3092\u691c\u7d22\u3059\u308b\u65b9\u6cd5<\/h2>\n
\u3053\u3053\u3067\u306f\u3001indexOf\u30e1\u30bd\u30c3\u30c9\u306e\u7b2c2\u5f15\u6570\u3092\u6307\u5b9a\u3057\u3066\u8907\u6570\u306e\u8981\u7d20\u3092\u691c\u7d22\u3059\u308b\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n
\u6b21\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
public class Main {\r\n    public static void main(String[] args) {\r\n\r\n        String str = \"samurai\";\r\n        int result;\r\n\r\n        for (int i = 0; i < str.length(); i++) {\r\n            result = str.indexOf(\"a\", i);\r\n            if (result != -1) {\r\n                System.out.println(\"\u8981\u7d20\u756a\u53f7 = \" + result);\r\n                i = result;\r\n            }\r\n        }\r\n\r\n    }\r\n}<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/p>\n
\u8981\u7d20\u756a\u53f7 = 1\r\n\u8981\u7d20\u756a\u53f7 = 5<\/pre>\n
\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f\u3001indexOf\u30e1\u30bd\u30c3\u30c9\u3067\u6307\u5b9a\u3057\u305f\u6587\u5b57\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u3092\u691c\u7d22\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u6587\u5b57\u304c\u898b\u3064\u304b\u3063\u305f\u5834\u5408\u306b\u306f\u3001\u305d\u306e\u4f4d\u7f6e\u306e\u6b21\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092indexOf\u30e1\u30bd\u30c3\u30c9\u306e\u7b2c2\u5f15\u6570\u306b\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u7d9a\u304d\u304b\u3089\u6b8b\u308a\u306e\u6587\u5b57\u5217\u3092\u691c\u7d22\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3053\u306e\u3088\u3046\u306b\u3057\u3066indexOf\u30e1\u30bd\u30c3\u30c9\u306e\u7b2c2\u5f15\u6570\u3092\u6307\u5b9a\u3057\u3066\u8907\u6570\u306e\u8981\u7d20\u3092\u691c\u7d22\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\uff01<\/p>\n
\u81ea\u4f5c\u30af\u30e9\u30b9\u5185\u306e\u5024\u3092indexOf\u3067\u691c\u7d22\u3059\u308b\u65b9\u6cd5<\/h2>\n
indexOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u81ea\u4f5c\u30af\u30e9\u30b9\u5185\u306b\u7279\u5b9a\u306e\u5024\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b<\/strong><\/span>\u78ba\u8a8d\u3059\u308b\u306b\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u5185\u90e8\u3067equals\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001List\u5185\u306b\u7279\u5b9a\u306e\u5024\u304c\u3042\u308b\u304b\u3092\u5224\u5b9a<\/strong><\/span>\u3057\u307e\u3059\u3002<\/p>\n
\u305d\u306e\u305f\u3081\u3001equals\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u3066\u81ea\u4f5c\u30af\u30e9\u30b9\u5185\u306e\u5024\u3068\u6bd4\u8f03\u3059\u308b\u3088\u3046\u306b\u5909\u66f4<\/strong><\/span>\u3059\u308b\u3068\u3001indexOf\u30e1\u30bd\u30c3\u30c9\u3067\u81ea\u4f5c\u30af\u30e9\u30b9\u5185\u306e\u5024\u3068\u6bd4\u8f03\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u6b21\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
import java.util.ArrayList;\r\nimport java.util.List;\r\n\r\nclass TestClass {\r\n    String str;\r\n \r\n    TestClass(String s){\r\n    str = s;\r\n    }\r\n \r\n    public boolean equals(Object obj) {\r\n        TestClass tc = (TestClass)obj;\r\n        String tcStr = tc.str;\r\n        return str.equals(tcStr);\r\n    }\r\n}\r\n \r\npublic class Main {\r\n    public static void main(String[] args) {\r\n        List<TestClass> list = new ArrayList<>();\r\n        TestClass testClass = new TestClass(\"samurai\");\r\n \r\n        list.add(testClass);\r\n \r\n        TestClass testClass2 = new TestClass(\"samurai\");\r\n        System.out.println(\"\u8981\u7d20\u756a\u53f7 = \" + list.indexOf(testClass2));\r\n    }\r\n}<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/p>\n
\u8981\u7d20\u756a\u53f7 = 0<\/pre>\n
\u3053\u3053\u3067\u306fequals\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u3066\u81ea\u4f5c\u30af\u30e9\u30b9\u5185\u306b\u5b9a\u7fa9\u3057\u305f\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
contains\u3068indexOf\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9(\u901f\u5ea6)\u306e\u6bd4\u8f03<\/h2>\n
contains\u30e1\u30bd\u30c3\u30c9\u3068indexOf\u30e1\u30bd\u30c3\u30c9\u306f\u4f7f\u3044\u65b9\u304c\u4f3c\u3066\u3044\u308b\u305f\u3081\u3001\u3069\u3061\u3089\u3092\u4f7f\u3063\u3066\u3082\u3044\u3044\u5834\u5408\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9(\u901f\u5ea6)\u304c\u826f\u3044\u65b9\u3092\u4f7f\u3044\u305f\u3044<\/strong><\/span>\u3067\u3059\u3088\u306d\u3002<\/p>\n
\u3053\u3053\u3067\u306f\u3001contains\u30e1\u30bd\u30c3\u30c9\u3068indexOf\u30e1\u30bd\u30c3\u30c9\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9(\u901f\u5ea6)\u306e\u6bd4\u8f03<\/strong><\/span>\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n
\u6b21\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
public class Main {\r\n    public static void main(String[] args) {\r\n\r\n        String[] str = new String[100];\r\n\r\n        for (int i = 0; i < 100; i++) {\r\n            str[i] = \"appleorangemelon\";\r\n        }\r\n\r\n        \/\/ contains\u691c\u7d22\u51e6\u7406\u958b\u59cb\r\n        long start1 = System.nanoTime();\r\n        for (int j = 0; j < 100; j++) {\r\n            boolean b = str[j].contains(\"orange\");\r\n        }\r\n\r\n        \/\/ contains\u51e6\u7406\u7d42\u4e86\u6642\u9593\r\n        long end1 = System.nanoTime();\r\n        System.out.println(\"contains\uff1a\" + (end1 - start1) \/ 1000000f + \"ms\");\r\n\r\n        \/\/ indexOf\u691c\u7d22\u51e6\u7406\u958b\u59cb\r\n        long start2 = System.nanoTime();\r\n        for (int k = 0; k < 100; k++) {\r\n            int num = str[k].indexOf(\"orange\");\r\n        }\r\n        \/\/ indexOf\u51e6\u7406\u7d42\u4e86\u6642\u9593\r\n        long end2 = System.nanoTime();\r\n        System.out.println(\"indexOf\uff1a\" + (end2 - start2) \/ 1000000f + \"ms\");\r\n    }\r\n}<\/pre>\n
[\u5b9f\u884c\u7d50\u679c]<\/p>\n
contains\uff1a0.089792ms\r\nindexOf\uff1a0.08806ms<\/pre>\n
\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f\u3001contains\u30e1\u30bd\u30c3\u30c9\u3068indexOf\u30e1\u30bd\u30c3\u30c9\u3067\u305d\u308c\u305e\u308c100\u56de\u691c\u7d22\u3057\u305f\u5834\u5408\u306e\u51e6\u7406\u901f\u5ea6\u3092\u6bd4\u8f03\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u5b9f\u884c\u7d50\u679c\u304b\u3089\u3001\u307b\u3068\u3093\u3069\u901f\u5ea6\u306b\u9055\u3044\u304c\u306a\u3044\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002<\/strong><\/span><\/p>\n
\u305d\u306e\u305f\u3081\u3001\u3069\u3061\u3089\u3092\u4f7f\u3063\u3066\u3082\u554f\u984c\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
\u307e\u3068\u3081<\/h2>\n
\u3044\u304b\u304c\u3067\u3057\u305f\u304b\uff1f<\/p>\n
\u4eca\u56de\u306fList\u3084String\u3001StringBuffer\u306e\u4e2d\u306b\u7279\u5b9a\u306e\u6587\u5b57\u5217\u3084\u5024\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u308b\u65b9\u6cd5<\/strong><\/span>\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n
indexOf\u30e1\u30bd\u30c3\u30c9\u306fList\u5185\u306b\u540c\u3058\u8981\u7d20\u304c\u8907\u6570\u3042\u3063\u3066\u3082\u3001\u6700\u521d\u306e\u8981\u7d20\u756a\u53f7\u3057\u304b\u8fd4\u3055\u306a\u3044\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u540c\u69d8\u306b\u3001lastIndexOf\u30e1\u30bd\u30c3\u30c9\u306f\u6700\u5f8c\u306e\u8981\u7d20\u756a\u53f7\u3057\u304b\u8fd4\u3055\u306a\u3044\u306e\u3067\u6c17\u3092\u3064\u3051\u3066\u304f\u3060\u3055\u3044\u306d\u3002<\/p>\n
\u3082\u3057indexOf\u30e1\u30bd\u30c3\u30c9\u3084lastIndexOf\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9<\/strong><\/span>\u3092\u5fd8\u308c\u3066\u3057\u307e\u3063\u305f\u3089\u3053\u306e\u8a18\u4e8b\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
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