{"id":131,"date":"2022-07-28T07:41:58","date_gmt":"2022-08-11T01:32:56","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%a7%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%a1%8c%e3%81%94%e3%81%a8%e3%81%ab%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95\/"},"modified":"2025-07-31T21:00:13","modified_gmt":"2025-07-31T12:00:13","slug":"java%e3%81%a7%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%a1%8c%e3%81%94%e3%81%a8%e3%81%ab%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%a1%8c%e3%81%94%e3%81%a8%e3%81%ab%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95\/","title":{"rendered":"Java\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u884c\u3054\u3068\u306b\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5"},"content":{"rendered":"

\u30a4\u30f3\u30c8\u30ed\u30c0\u30af\u30b7\u30e7\u30f3<\/h3>\n

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Java\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u306e\u5185\u5bb9\u3092\u884c\u3054\u3068\u306b\u8aad\u307f\u53d6\u308b\u305f\u3081\u306e\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u6b21\u306eJava\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\uff1ajava.io.BufferedReader\u3001java.util.Scanner\u3001Files.readAllLines\uff08\uff09\u3001\u304a\u3088\u3073java.io.RandomAccessFile\u3002<\/p>\n

BufferedReader\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u884c\u5358\u4f4d\u3067\u8aad\u3080<\/h2>\n

java.io.BufferedReader\u306ereadLine()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u4e00\u884c\u305a\u3064\u6587\u5b57\u5217\u3068\u3057\u3066\u8aad\u307f\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u7d42\u7aef\u306b\u9054\u3057\u305f\u969b\u306bnull\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n

\u4ee5\u4e0b\u306f\u3001BufferedReader\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u30921\u884c\u305a\u3064\u8aad\u307f\u8fbc\u3080\u4f8b\u984c\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

ReadFileLineByLineUsingBufferedReader.java\u3068\u3044\u3046\u30d5\u30a1\u30a4\u30eb\u3092BufferedReader\u3092\u4f7f\u3063\u3066\uff11\u884c\u305a\u3064\u8aad\u3080\u3002<\/div>\n
package<\/span> com.<\/span>scdev.<\/span>readfileslinebyline<\/span>;<\/span>\r\n\r\nimport<\/span> java.<\/span>io.<\/span><\/span>BufferedReader<\/span><\/span>;<\/span>\r\nimport<\/span> java.<\/span>io.<\/span><\/span>FileReader<\/span><\/span>;<\/span>\r\nimport<\/span> java.<\/span>io.<\/span><\/span>IOException<\/span><\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> ReadFileLineByLineUsingBufferedReader<\/span> {<\/span>\r\n\r\n\tpublic<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n\t\tBufferedReader<\/span> reader;<\/span>\r\n\r\n\t\ttry<\/span> {<\/span>\r\n\t\t\treader =<\/span> new<\/span> BufferedReader<\/span>(<\/span>new<\/span> FileReader<\/span>(<\/span>\"sample.txt\"<\/span>)<\/span>)<\/span>;<\/span>\r\n\t\t\tString<\/span> line =<\/span> reader.<\/span>readLine<\/span>(<\/span>)<\/span>;<\/span>\r\n\r\n\t\t\twhile<\/span> (<\/span>line !=<\/span> null<\/span>)<\/span> {<\/span>\r\n\t\t\t\tSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>line)<\/span>;<\/span>\r\n\t\t\t\t\/\/ read next line<\/span>\r\n\t\t\t\tline =<\/span> reader.<\/span>readLine<\/span>(<\/span>)<\/span>;<\/span>\r\n\t\t\t}<\/span>\r\n\r\n\t\t\treader.<\/span>close<\/span>(<\/span>)<\/span>;<\/span>\r\n\t\t}<\/span> catch<\/span> (<\/span>IOException<\/span> e)<\/span> {<\/span>\r\n\t\t\te.<\/span>printStackTrace<\/span>(<\/span>)<\/span>;<\/span>\r\n\t\t}<\/span>\r\n\t}<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
Java SE 8 \u306e BufferedReader API \u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3067\u5b66\u7fd2\u3092\u7d9a\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u30b9\u30ad\u30e3\u30ca\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u4e00\u884c\u305a\u3064\u8aad\u307f\u8fbc\u3080\u3002<\/h2>\n
Scanner\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u304d\u3001\u305d\u306e\u5185\u5bb9\u3092\u884c\u3054\u3068\u306b\u8aad\u307f\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306f\u3001Scanner\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u884c\u3054\u3068\u306b\u8aad\u307f\u53d6\u308b\u305f\u3081\u306e\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3059\u3002<\/p>\n
ReadFileLineByLineUsingScanner.java\u3092\u4f7f\u3063\u3066\u3001\u4e00\u884c\u305a\u3064\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u3002<\/div>\n
package<\/span> com.<\/span>scdev.<\/span>readfileslinebyline<\/span>;<\/span>\r\n\r\nimport<\/span> java.<\/span>io.<\/span><\/span>File<\/span><\/span>;<\/span>\r\nimport<\/span> java.<\/span>io.<\/span><\/span>FileNotFoundException<\/span><\/span>;<\/span>\r\nimport<\/span> java.<\/span>util.<\/span><\/span>Scanner<\/span><\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> ReadFileLineByLineUsingScanner<\/span> {<\/span>\r\n\r\n\tpublic<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n\t\ttry<\/span> {<\/span>\r\n\t\t\tScanner<\/span> scanner =<\/span> new<\/span> Scanner<\/span>(<\/span>new<\/span> File<\/span>(<\/span>\"sample.txt\"<\/span>)<\/span>)<\/span>;<\/span>\r\n\r\n\t\t\twhile<\/span> (<\/span>scanner.<\/span>hasNextLine<\/span>(<\/span>)<\/span>)<\/span> {<\/span>\r\n\t\t\t\tSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>scanner.<\/span>nextLine<\/span>(<\/span>)<\/span>)<\/span>;<\/span>\r\n\t\t\t}<\/span>\r\n\r\n\t\t\tscanner.<\/span>close<\/span>(<\/span>)<\/span>;<\/span>\r\n\t\t}<\/span> catch<\/span> (<\/span>FileNotFoundException<\/span> e)<\/span> {<\/span>\r\n\t\t\te.<\/span>printStackTrace<\/span>(<\/span>)<\/span>;<\/span>\r\n\t\t}<\/span>\r\n\t}<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
Scanner API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\uff08Java SE 8\uff09\u3067\u5b66\u7fd2\u3092\u7d9a\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
Files\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u4e00\u884c\u305a\u3064\u8aad\u307f\u8fbc\u3080\u3002<\/h2>\n
java.nio.file.Files\u3068\u3044\u3046\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30af\u30e9\u30b9\u306b\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u4fbf\u5229\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002readAllLines()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u3059\u3079\u3066\u306e\u30d5\u30a1\u30a4\u30eb\u306e\u884c\u3092\u6587\u5b57\u5217\u306e\u30ea\u30b9\u30c8\u306b\u8aad\u307f\u8fbc\u3080\u305f\u3081\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306b\u306f\u3001Files\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u30921\u884c\u305a\u3064\u8aad\u307f\u8fbc\u3080\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4f8b\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
ReadFileLineByLineUsingFiles.java\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u884c\u3054\u3068\u306b\u8aad\u307f\u8fbc\u3080\u3002<\/div>\n
package<\/span> com.<\/span>scdev.<\/span>readfileslinebyline<\/span>;<\/span>\r\n\r\nimport<\/span> java.<\/span>io.<\/span><\/span>IOException<\/span><\/span>;<\/span>\r\nimport<\/span> java.<\/span>nio.<\/span>file.<\/span><\/span>Files<\/span><\/span>;<\/span>\r\nimport<\/span> java.<\/span>nio.<\/span>file.<\/span><\/span>Paths<\/span><\/span>;<\/span>\r\nimport<\/span> java.<\/span>util.<\/span><\/span>List<\/span><\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> ReadFileLineByLineUsingFiles<\/span> {<\/span>\r\n\r\n\tpublic<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n\t\ttry<\/span> {<\/span>\r\n\t\t\tList<\/span><<\/span>String<\/span>><\/span><\/span> allLines =<\/span> Files<\/span>.<\/span>readAllLines<\/span>(<\/span>Paths<\/span>.<\/span>get<\/span>(<\/span>\"sample.txt\"<\/span>)<\/span>)<\/span>;<\/span>\r\n\r\n\t\t\tfor<\/span> (<\/span>String<\/span> line :<\/span> allLines)<\/span> {<\/span>\r\n\t\t\t\tSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>line)<\/span>;<\/span>\r\n\t\t\t}<\/span>\r\n\t\t}<\/span> catch<\/span> (<\/span>IOException<\/span> e)<\/span> {<\/span>\r\n\t\t\te.<\/span>printStackTrace<\/span>(<\/span>)<\/span>;<\/span>\r\n\t\t}<\/span>\r\n\t}<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
Java SE 8\u306eFiles API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3067\u5b66\u3073\u3092\u7d9a\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u30e9\u30f3\u30c0\u30e0\u30a2\u30af\u30bb\u30b9\u30d5\u30a1\u30a4\u30eb\u3092\u4f7f\u7528\u3057\u3066\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u884c\u3054\u3068\u306b\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5\u3092\u8aad\u3080\u3002<\/h2>\n
RandomAccessFile\u3092\u4f7f\u7528\u3057\u3066\u3001\u8aad\u307f\u8fbc\u307f\u30e2\u30fc\u30c9\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u304d\u3001\u305d\u306ereadLine\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u884c\u5358\u4f4d\u3067\u8aad\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306b\u306f\u3001RandomAccessFile\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u884c\u3054\u3068\u306b\u8aad\u307f\u8fbc\u3080\u305f\u3081\u306e\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u30e9\u30f3\u30c0\u30e0\u30a2\u30af\u30bb\u30b9\u30d5\u30a1\u30a4\u30eb\u3092\u4f7f\u7528\u3057\u3066\u3001ReadFileLineByLineUsingRandomAccessFile.java\u30921\u884c\u305a\u3064\u8aad\u307f\u53d6\u308b\u3002<\/div>\n
package<\/span> com.<\/span>scdev.<\/span>readfileslinebyline<\/span>;<\/span>\r\n\r\nimport<\/span> java.<\/span>io.<\/span><\/span>IOException<\/span><\/span>;<\/span>\r\nimport<\/span> java.<\/span>io.<\/span><\/span>RandomAccessFile<\/span><\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> ReadFileLineByLineUsingRandomAccessFile<\/span> {<\/span>\r\n\r\n\tpublic<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n\t\ttry<\/span> {<\/span>\r\n\t\t\tRandomAccessFile<\/span> file =<\/span> new<\/span> RandomAccessFile<\/span>(<\/span>\"sample.txt\"<\/span>,<\/span> \"r\"<\/span>)<\/span>;<\/span>\r\n\t\t\tString<\/span> str;<\/span>\r\n\r\n\t\t\twhile<\/span> (<\/span>(<\/span>str =<\/span> file.<\/span>readLine<\/span>(<\/span>)<\/span>)<\/span> !=<\/span> null<\/span>)<\/span> {<\/span>\r\n\t\t\t\tSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>str)<\/span>;<\/span>\r\n\t\t\t}<\/span>\r\n\r\n\t\t\tfile.<\/span>close<\/span>(<\/span>)<\/span>;<\/span>\r\n\t\t}<\/span> catch<\/span> (<\/span>IOException<\/span> e)<\/span> {<\/span>\r\n\t\t\te.<\/span>printStackTrace<\/span>(<\/span>)<\/span>;<\/span>\r\n\t\t}<\/span>\r\n\t}<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
Java SE 8\u306eRandomAccessFile API\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u5229\u7528\u3057\u3066\u5b66\u7fd2\u3092\u7d9a\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Java\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u306e\u5185\u5bb9\u3092\u884c\u3054\u3068\u306b\u8aad\u307f\u53d6\u308b\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3057\u305f\u3002<\/p>\n
\u3055\u3089\u306bJava\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3092\u5229\u7528\u3057\u3066\u5b66\u7fd2\u3092\u7d9a\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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