{"id":119,"date":"2022-08-03T00:57:53","date_gmt":"2023-08-20T22:30:26","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%aestring%e3%81%ab%e9%96%a2%e3%81%99%e3%82%8b%e9%9d%a2%e6%8e%a5%e3%81%ae%e8%b3%aa%e5%95%8f%e3%81%a8%e5%9b%9e%e7%ad%94\/"},"modified":"2025-07-31T20:53:04","modified_gmt":"2025-07-31T11:53:04","slug":"java%e3%81%aestring%e3%81%ab%e9%96%a2%e3%81%99%e3%82%8b%e9%9d%a2%e6%8e%a5%e3%81%ae%e8%b3%aa%e5%95%8f%e3%81%a8%e5%9b%9e%e7%ad%94","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aestring%e3%81%ab%e9%96%a2%e3%81%99%e3%82%8b%e9%9d%a2%e6%8e%a5%e3%81%ae%e8%b3%aa%e5%95%8f%e3%81%a8%e5%9b%9e%e7%ad%94\/","title":{"rendered":"Java\u306eString\u306b\u95a2\u3059\u308b\u9762\u63a5\u306e\u8cea\u554f\u3068\u56de\u7b54"},"content":{"rendered":"

\u4ee5\u4e0b\u3001\u65e5\u672c\u8a9e\u3067\u81ea\u7136\u306a\u8a00\u3044\u65b9\u306b\u8a00\u3044\u63db\u3048\u307e\u3059\uff08\u4e00\u3064\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\uff09\uff1a\u3010\u3054\u6328\u62f6\u3011<\/h3>\n

\u300cString\u300d\u3068\u3044\u3046\u306e\u306f\u3001\u6700\u3082\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u308bJava\u30af\u30e9\u30b9\u306e\u4e00\u3064\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u9762\u63a5\u306e\u6e96\u5099\u306e\u305f\u3081\u306b\u3001String\u306b\u95a2\u3059\u308b\u7df4\u7fd2\u554f\u984c\u3068\u56de\u7b54\u3092\u3044\u304f\u3064\u304b\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n

Java\u306eString\u30af\u30e9\u30b9\u306e\u77e5\u8b58\u3092\u30c6\u30b9\u30c8\u3059\u308b\u305f\u3081\u306b\u3001Java\u306eString\u30af\u30a4\u30ba\u3082\u8a66\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

Java\u306eString\u30af\u30e9\u30b9\u3068\u306f\u4f55\u3067\u3059\u304b\uff1fString\u306f\u30c7\u30fc\u30bf\u578b\u3067\u3059\u304b\uff1f<\/h2>\n

Java\u3067\u306eString\u306f\u30af\u30e9\u30b9\u3067\u3042\u308a\u3001java.lang\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002int\u3084long\u306e\u3088\u3046\u306a\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u30c7\u30fc\u30bf\u578b\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002String\u30af\u30e9\u30b9\u306f\u6587\u5b57\u5217\u3092\u8868\u3057\u307e\u3059\u3002\u307b\u3068\u3093\u3069\u306eJava\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067String\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002String\u306fJava\u3067\u306f\u4e0d\u5909\u3067final\u3067\u3059\u3002JVM\u306f\u3059\u3079\u3066\u306eString\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u683c\u7d0d\u3059\u308b\u305f\u3081\u306b\u6587\u5b57\u5217\u30d7\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u30c0\u30d6\u30eb\u30af\u30aa\u30fc\u30c8\u3092\u4f7f\u7528\u3057\u3066String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001+\u6f14\u7b97\u5b50\u3092\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3057\u3066\u9023\u7d50\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n

Java\u3067String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306e\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u306f\u3042\u308a\u307e\u3059\u304b\uff1f<\/h2>\n

\u65b0\u3057\u3044\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u3066String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3057\u3001\u30c0\u30d6\u30eb\u30af\u30a9\u30fc\u30c8\u3092\u4f7f\u7528\u3057\u3066String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\uff1a<\/p>\n

String<\/span> str =<\/span> new<\/span> String<\/span>(<\/span>\"abc\"<\/span>)<\/span>;<\/span>\r\nString<\/span> str1 =<\/span> \"abc\"<\/span>;<\/span>\r\n<\/code><\/pre>\n
String\u30af\u30e9\u30b9\u306b\u306f\u3001\u6587\u5b57\u914d\u5217\u3001\u30d0\u30a4\u30c8\u914d\u5217\u3001StringBuffer\u3001\u304a\u3088\u3073StringBuilder\u304b\u3089\u6587\u5b57\u5217\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306e\u3044\u304f\u3064\u304b\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u30c0\u30d6\u30eb\u30af\u30a9\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066String\u3092\u4f5c\u6210\u3059\u308b\u3068\u3001JVM\u306fString\u30d7\u30fc\u30eb\u3092\u8abf\u3079\u3066\u540c\u3058\u5024\u3092\u6301\u3064\u4ed6\u306eString\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u8abf\u3079\u307e\u3059\u3002\u3082\u3057String\u304c\u65e2\u306b\u30d7\u30fc\u30eb\u306b\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001JVM\u306f\u305d\u306eString\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u53c2\u7167\u3092\u8fd4\u3057\u307e\u3059\u3002\u65b0\u3057\u3044String\u304c\u30d7\u30fc\u30eb\u306b\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u3001JVM\u306f\u6307\u5b9a\u3055\u308c\u305f\u5024\u3092\u6301\u3064\u65b0\u3057\u3044String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3001\u305d\u308c\u3092string pool\u306b\u683c\u7d0d\u3057\u307e\u3059\u3002new\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001JVM\u306fString\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059\u304c\u3001string pool\u306b\u306f\u683c\u7d0d\u3057\u307e\u305b\u3093\u3002intern()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092String pool\u306b\u683c\u7d0d\u3059\u308b\u304b\u3001\u3082\u3057\u65e2\u306b\u7b49\u3057\u3044\u5024\u3092\u6301\u3064String\u304c\u30d7\u30fc\u30eb\u306b\u5b58\u5728\u3059\u308b\u5834\u5408\u306f\u305d\u306e\u53c2\u7167\u3092\u8fd4\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u5165\u529b\u3055\u308c\u305f\u6587\u5b57\u5217\u304c\u56de\u6587\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u305f\u3081\u306eJava\u30e1\u30bd\u30c3\u30c9\u3092\u66f8\u3044\u3066\u304f\u3060\u3055\u3044\u3002<\/h2>\n
\u6587\u5b57\u5217\u304c\u9006\u306b\u306a\u3063\u3066\u3082\u540c\u3058\u5024\u3092\u6301\u3064\u5834\u5408\u3001\u305d\u308c\u306f\u56de\u6587\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001aba\u306f\u56de\u6587\u306e\u6587\u5b57\u5217\u3067\u3059\u3002String\u30af\u30e9\u30b9\u306b\u306f\u6587\u5b57\u5217\u3092\u9006\u306b\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306f\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u304c\u3001StringBuffer\u30af\u30e9\u30b9\u3068StringBuilder\u30af\u30e9\u30b9\u306b\u306f\u56de\u6587\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u308breverse()\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\uff1a<\/p>\n
private<\/span> static<\/span> boolean<\/span> isPalindrome<\/span>(<\/span>String<\/span> str)<\/span> {<\/span>\r\n    if<\/span> (<\/span>str ==<\/span> null<\/span>)<\/span>\r\n        return<\/span> false<\/span>;<\/span>\r\n    StringBuilder<\/span> strBuilder =<\/span> new<\/span> StringBuilder<\/span>(<\/span>str)<\/span>;<\/span>\r\n    strBuilder.<\/span>reverse<\/span>(<\/span>)<\/span>;<\/span>\r\n    return<\/span> strBuilder.<\/span>toString<\/span>(<\/span>)<\/span>.<\/span>equals<\/span>(<\/span>str)<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6642\u3005\u3001\u9762\u63a5\u5b98\u306f\u4ed6\u306e\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u306a\u3044\u3067\u56de\u6587\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3088\u3046\u306b\u304a\u9858\u3044\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u3001\u6587\u5b57\u5217\u306e\u4e21\u7aef\u304b\u3089\u6587\u5b57\u3092\u6bd4\u8f03\u3057\u3066\u56de\u6587\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\uff1a<\/p>\n
private<\/span> static<\/span> boolean<\/span> isPalindromeString<\/span>(<\/span>String<\/span> str)<\/span> {<\/span>\r\n    if<\/span> (<\/span>str ==<\/span> null<\/span>)<\/span>\r\n        return<\/span> false<\/span>;<\/span>\r\n    int<\/span> length =<\/span> str.<\/span>length<\/span>(<\/span>)<\/span>;<\/span>\r\n    System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>length \/<\/span> 2<\/span>)<\/span>;<\/span>\r\n    for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> length \/<\/span> 2<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>\r\n         if<\/span> (<\/span>str.<\/span>charAt<\/span>(<\/span>i)<\/span> !=<\/span> str.<\/span>charAt<\/span>(<\/span>length -<\/span> i -<\/span> 1<\/span>)<\/span>)<\/span>\r\n            return<\/span> false<\/span>;<\/span>\r\n    }<\/span>\r\n    return<\/span> true<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6307\u5b9a\u3055\u308c\u305f\u6587\u5b57\u3092\u6587\u5b57\u5217\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089\u524a\u9664\u3059\u308bJava\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u6210\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/h2>\n
replaceAll\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u6587\u5b57\u5217\u306e\u3059\u3079\u3066\u306e\u51fa\u73fe\u7b87\u6240\u3092\u4ed6\u306e\u6587\u5b57\u5217\u3067\u7f6e\u63db\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u91cd\u8981\u306a\u70b9\u306f\u3001replaceAll()\u304c\u5f15\u6570\u3068\u3057\u3066String\u3092\u53d7\u3051\u5165\u308c\u308b\u305f\u3081\u3001Character\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u3092\u4f5c\u6210\u3057\u3001\u305d\u308c\u3092\u7a7a\u306e\u6587\u5b57\u5217\u3067\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n
private<\/span> static<\/span> String<\/span> removeChar<\/span>(<\/span>String<\/span> str,<\/span> char<\/span> c)<\/span> {<\/span>\r\n    if<\/span> (<\/span>str ==<\/span> null<\/span>)<\/span>\r\n        return<\/span> null<\/span>;<\/span>\r\n    return<\/span> str.<\/span>replaceAll<\/span>(<\/span>Character<\/span>.<\/span>toString<\/span>(<\/span>c)<\/span>,<\/span> \"\"<\/span>)<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Java\u3067\u6587\u5b57\u5217\u3092\u5927\u6587\u5b57\u307e\u305f\u306f\u5c0f\u6587\u5b57\u306b\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h2>\n
String\u30af\u30e9\u30b9\u306etoUpperCase\u30e1\u30bd\u30c3\u30c9\u3068toLowerCase\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u6587\u5b57\u5217\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u3059\u3079\u3066\u5927\u6587\u5b57\u307e\u305f\u306f\u5c0f\u6587\u5b57\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u306b\u306f\u3001Locale\u5f15\u6570\u3092\u53d7\u3051\u5165\u308c\u3001\u6307\u5b9a\u3055\u308c\u305f\u5730\u57df\u306e\u898f\u5247\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u3092\u5927\u6587\u5b57\u307e\u305f\u306f\u5c0f\u6587\u5b57\u306b\u5909\u63db\u3059\u308b\u30d0\u30ea\u30a2\u30f3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u300cString\u306esubSequence\u30e1\u30bd\u30c3\u30c9\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\u300d<\/h2>\n
Java 1.4\u3067CharSequence\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u5c0e\u5165\u3055\u308c\u3001String\u30af\u30e9\u30b9\u306f\u3053\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3057\u3066\u3044\u308b\u305f\u3081\u3001String\u30af\u30e9\u30b9\u306b\u306fsubSequence\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002\u5185\u90e8\u7684\u306b\u306f\u3001subSequence\u30e1\u30bd\u30c3\u30c9\u306fString\u306esubstring\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002<\/p>\n
Java\u30d7\u30ed\u30b0\u30e9\u30e0\u30672\u3064\u306e\u6587\u5b57\u5217\u3092\u6bd4\u8f03\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f (Java puroguramu de futatsu no mojiretsu wo hikaku suru houhou wa nan desu ka?)<\/h2>\n
Java\u306eString\u306f\u30012\u3064\u306e\u30d0\u30ea\u30a2\u30f3\u30c8\u306ecompareTo()\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064Comparable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3057\u3066\u3044\u307e\u3059\u3002compareTo(String anotherString)\u30e1\u30bd\u30c3\u30c9\u306f\u3001String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5f15\u6570\u3067\u6e21\u3055\u308c\u305f\u6587\u5b57\u5217\u3068\u8f9e\u66f8\u9806\u3067\u6bd4\u8f03\u3057\u307e\u3059\u3002String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5f15\u6570\u3088\u308a\u3082\u524d\u306b\u3042\u308b\u5834\u5408\u3001\u8ca0\u306e\u6574\u6570\u3092\u8fd4\u3057\u3001String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5f15\u6570\u3088\u308a\u3082\u5f8c\u306b\u3042\u308b\u5834\u5408\u3001\u6b63\u306e\u6574\u6570\u3092\u8fd4\u3057\u307e\u3059\u3002\u4e21\u65b9\u306eString\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5024\u304c\u540c\u3058\u5834\u5408\u306f\u3001\u30bc\u30ed\u3092\u8fd4\u3057\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001equals(String str)\u30e1\u30bd\u30c3\u30c9\u3082true\u3092\u8fd4\u3057\u307e\u3059\u3002compareToIgnoreCase(String str)\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6700\u521d\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u4f3c\u3066\u3044\u307e\u3059\u304c\u3001\u5927\u6587\u5b57\u3068\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u307e\u305b\u3093\u3002\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u7121\u8996\u3057\u305f\u6bd4\u8f03\u306b\u306f\u3001CASE_INSENSITIVE_ORDER\u3092\u4f7f\u7528\u3057\u305fComparator\u3092\u5229\u7528\u3057\u307e\u3059\u3002\u5024\u304c\u30bc\u30ed\u306e\u5834\u5408\u3001equalsIgnoreCase(String str)\u3082true\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
Java\u3067String\u3092\u6587\u5b57\u914d\u5217\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h2>\n
String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u6587\u5b57\u306e\u30b7\u30fc\u30b1\u30f3\u30b9\u3067\u3059\u306e\u3067\u30011\u3064\u306e\u6587\u5b57\u306b\u5909\u63db\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u6307\u5b9a\u3055\u308c\u305f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u6587\u5b57\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u3001charAt\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u304b\u3001toCharArray()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u3092\u6587\u5b57\u914d\u5217\u306b\u5909\u63db\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6587\u5b57\u5217\u3092\u6587\u5b57\u914d\u5217\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u5b66\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n
Java\u3067\u6587\u5b57\u5217\u3092\u30d0\u30a4\u30c8\u914d\u5217\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306f\u3069\u3046\u3067\u3059\u304b\uff1f<\/h2>\n
String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30d0\u30a4\u30c8\u914d\u5217\u306b\u5909\u63db\u3059\u308b\u306b\u306f\u3001getBytes()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u30d0\u30a4\u30c8\u914d\u5217\u3092String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u3059\u308b\u306b\u306f\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bfnew String(byte[] arr)\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u6587\u5b57\u5217\u3092\u30d0\u30a4\u30c8\u914d\u5217\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3082\u3063\u3068\u5b66\u3073\u307e\u3057\u3087\u3046\u3002<\/p>\n
Java\u3067switch case\u6587\u3067String\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u3059\u304b\uff1f<\/h2>\n
Java 7\u3067\u306f\u3001switch case\u304c\u6587\u5b57\u5217\u306b\u5bfe\u5fdc\u3057\u3001\u305d\u308c\u4ee5\u524d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u306f\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002\u6587\u5b57\u5217\u306e\u6761\u4ef6\u30d5\u30ed\u30fc\u3092\u5b9f\u88c5\u3059\u308b\u5834\u5408\u306f\u3001Java 7\u4ee5\u964d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u306fif-else\u6587\u3001\u307e\u305f\u306fswitch case\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002Java\u306eswitch case\u6587\u306b\u3064\u3044\u3066\u3082\u3063\u3068\u5b66\u3073\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u6587\u5b57\u5217\u306e\u3059\u3079\u3066\u306e\u9806\u5217\u3092\u51fa\u529b\u3059\u308b\u305f\u3081\u306eJava\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/h2>\n
\u6587\u5b57\u5217\u306e\u3059\u3079\u3066\u306e\u9806\u5217\u3092\u898b\u3064\u3051\u308b\u306b\u306f\u3001\u518d\u5e30\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001 AAB \u306e\u9806\u5217\u306f AAB\u3001ABA\u3001BAA \u3067\u3059\u3002\u307e\u305f\u3001\u91cd\u8907\u3059\u308b\u5024\u304c\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u306b\u306f\u3001Set \u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u6587\u5b57\u5217\u306e\u3059\u3079\u3066\u306e\u9806\u5217\u3092\u898b\u3064\u3051\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u5b66\u3073\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u4e0e\u3048\u3089\u308c\u305f\u6587\u5b57\u5217\u306b\u304a\u3051\u308b\u6700\u9577\u306e\u56de\u6587\u3092\u898b\u3064\u3051\u308b\u305f\u3081\u306eJava\u95a2\u6570\u3092\u4f5c\u6210\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/h2>\n
\u6587\u5b57\u5217\u306b\u306f\u56de\u6587\u306e\u90e8\u5206\u6587\u5b57\u5217\u304c\u542b\u307e\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u6587\u5b57\u5217\u5185\u3067\u6700\u9577\u306e\u56de\u6587\u90e8\u5206\u6587\u5b57\u5217\u3092\u898b\u3064\u3051\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3082\u3063\u3068\u8a73\u3057\u304f\u5b66\u3073\u307e\u3057\u3087\u3046\u3002<\/p>\n
Java\u306b\u304a\u3051\u308bString\u3001StringBuffer\u3001\u304a\u3088\u3073StringBuilder\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h2>\n
Java\u306b\u304a\u3044\u3066\u3001String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u4e0d\u5909\u3067final\u3067\u3059\u306e\u3067\u3001String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u3044\u3058\u308b\u5ea6\u306b\u65b0\u3057\u3044String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002String\u306e\u64cd\u4f5c\u306f\u30ea\u30bd\u30fc\u30b9\u3092\u6d88\u8cbb\u3059\u308b\u305f\u3081\u3001Java\u306b\u306fString\u3092\u64cd\u4f5c\u3059\u308b\u305f\u3081\u306e2\u3064\u306e\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30af\u30e9\u30b9\u3001StringBuffer\u3068StringBuilder\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
StringBuffer\u3068StringBuilder\u306f\u53ef\u5909\u30af\u30e9\u30b9\u3067\u3059\u3002StringBuffer\u306e\u64cd\u4f5c\u306f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u540c\u671f\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001StringBuilder\u306e\u64cd\u4f5c\u306f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306fStringBuffer\u3092\u4f7f\u7528\u3057\u3001\u30b7\u30f3\u30b0\u30eb\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306fStringBuilder\u3092\u4f7f\u7528\u3059\u308b\u3079\u304d\u3067\u3059\u3002StringBuilder\u306f\u540c\u671f\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u304c\u306a\u3044\u305f\u3081\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304cStringBuffer\u3088\u308a\u3082\u901f\u3044\u3067\u3059\u3002<\/p>\n
String\u3001StringBuffer\u3001\u304a\u3088\u3073StringBuilder\u306e\u9055\u3044\u3068\u3001StringBuffer\u3068StringBuilder\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30ad\u30f3\u30b0\u306b\u3064\u3044\u3066\u3001\u8a73\u3057\u304f\u8abf\u3079\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u306a\u305cJava\u3067\u306fString\u306f\u4e0d\u5909\u306a\u306e\u3067\u3059\u304b\uff1f<\/h2>\n
Java\u306b\u304a\u3044\u3066\u3001String\u306f\u4e0d\u5909(immutable)\u3067\u3042\u308b\u305f\u3081\u3001\u3044\u304f\u3064\u304b\u306e\u5229\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
    \n
  • String pool is possible because String is immutable in Java.<\/li>\n
  • It increases security because any hacker can\u2019t change its value and it\u2019s used for storing sensitive information such as a database username or password.<\/li>\n
  • Since String is immutable, it\u2019s safe to use in multi-threading and you don\u2019t need any synchronization.<\/li>\n
  • Strings are used in Java class loaders and immutability provides assurance that the correct class is getting loaded by the ClassLoader class.<\/li>\n<\/ul>\n
    Java\u306b\u304a\u3051\u308bString\u306e\u30a4\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\u6027\u306b\u3064\u3044\u3066\u3055\u3089\u306b\u8a73\u3057\u304f\u5b66\u3073\u307e\u3057\u3087\u3046\u3002<\/p>\n
    Java\u3067\u6587\u5b57\u5217\u3092\u5206\u5272\u3059\u308b\u306b\u306f\u3001\u3069\u306e\u3088\u3046\u306b\u3059\u308c\u3070\u3044\u3044\u3067\u3059\u304b\uff1f<\/h2>\n
    \u63d0\u4f9b\u3055\u308c\u305f\u6b63\u898f\u8868\u73fe\u306b\u57fa\u3065\u3044\u3066\u3001split(String regex)\u3092\u4f7f\u7528\u3057\u3066String\u3092String\u914d\u5217\u306b\u5206\u5272\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
    \u306a\u305cJava\u3067\u30d1\u30b9\u30ef\u30fc\u30c9\u306e\u4fdd\u5b58\u306b\u6587\u5b57\u914d\u5217\u304c\u597d\u307e\u308c\u308b\u306e\u3067\u3059\u304b\uff1f<\/h2>\n
    Java\u3067\u306fString\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u4e0d\u5909\u3067\u3042\u308a\u3001\u6587\u5b57\u5217\u30d7\u30fc\u30eb\u306b\u683c\u7d0d\u3055\u308c\u307e\u3059\u3002\u4f5c\u6210\u3055\u308c\u305fString\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304c\u5b8c\u4e86\u3059\u308b\u307e\u3067\u30d7\u30fc\u30eb\u306b\u4fdd\u6301\u3055\u308c\u308b\u305f\u3081\u3001\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u7d42\u308f\u3063\u3066\u3082\u30e1\u30e2\u30ea\u4e0a\u3067\u5229\u7528\u53ef\u80fd\u3067\u3059\u3002\u3053\u308c\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4e0a\u306e\u30ea\u30b9\u30af\u3068\u306a\u308a\u3001\u30e1\u30e2\u30ea\u30c0\u30f3\u30d7\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u8005\u306f\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u5e73\u6587\u3067\u898b\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u683c\u7d0d\u3059\u308b\u305f\u3081\u306b\u6587\u5b57\u914d\u5217\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u4f7f\u7528\u3057\u7d42\u308f\u3063\u305f\u5f8c\u306b\u7a7a\u767d\u306b\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30e1\u30e2\u30ea\u4e0a\u3067\u5229\u7528\u53ef\u80fd\u306a\u671f\u9593\u3092\u5236\u5fa1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u3053\u308c\u306b\u3088\u308a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4e0a\u306e\u8105\u5a01\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
    Java\u30672\u3064\u306e\u6587\u5b57\u5217\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u65b9\u6cd5\u306f\u3042\u308a\u307e\u3059\u304b\uff1f<\/h2>\n
    2\u3064\u306e\u6587\u5b57\u5217\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u65b9\u6cd5\u306f2\u3064\u3042\u308a\u307e\u3059\u3002==\u6f14\u7b97\u5b50\u307e\u305f\u306fequals()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002==\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u6587\u5b57\u5217\u306e\u5024\u3060\u3051\u3067\u306a\u304f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u53c2\u7167\u3082\u30c1\u30a7\u30c3\u30af\u3055\u308c\u307e\u3059\u3002Java\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u306f\u3001\u6587\u5b57\u5217\u306e\u5024\u306e\u7b49\u3057\u3055\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002\u3053\u306e\u5834\u5408\u3001equals()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u30662\u3064\u306e\u6587\u5b57\u5217\u304c\u7b49\u3057\u3044\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u7121\u8996\u3059\u308b\u305f\u3081\u306bequalsIgnoreCase\u3068\u3044\u3046\u5225\u306e\u95a2\u6570\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n
    String<\/span> s1 =<\/span> \"abc\"<\/span>;<\/span>\r\nString<\/span> s2 =<\/span> \"abc\"<\/span>;<\/span>\r\nString<\/span> s3 =<\/span> new<\/span> String<\/span>(<\/span>\"abc\"<\/span>)<\/span>;<\/span>\r\n\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"s1 == s2 ? \"<\/span> +<\/span> (<\/span>s1 ==<\/span> s2)<\/span>)<\/span>;<\/span> \/\/true<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"s1 == s3 ? \"<\/span> +<\/span> (<\/span>s1 ==<\/span> s3)<\/span>)<\/span>;<\/span> \/\/false<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"s1 equals s3 ? \"<\/span> +<\/span> (<\/span>s1.<\/span>equals<\/span>(<\/span>s3)<\/span>)<\/span>)<\/span>;<\/span> \/\/true<\/span>\r\n<\/code><\/pre>\n
    Java\u306b\u304a\u3051\u308b\u6587\u5b57\u5217\u30d7\u30fc\u30eb\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h2>\n
    \u6587\u5b57\u5217\u30d7\u30fc\u30eb\u306f\u3001Java\u306e\u30d2\u30fc\u30d7\u30e1\u30e2\u30ea\u306b\u4fdd\u5b58\u3055\u308c\u3066\u3044\u308bString\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30fc\u30eb\u3067\u3059\u3002String\u306fJava\u306e\u7279\u5225\u306a\u30af\u30e9\u30b9\u3067\u3042\u308a\u3001new\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u3066String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3082\u3001\u30c0\u30d6\u30eb\u30af\u30a9\u30fc\u30c8\u5185\u306b\u5024\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3082\u53ef\u80fd\u3067\u3059\u3002Java\u306e\u6587\u5b57\u5217\u30d7\u30fc\u30eb\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u5b66\u3073\u307e\u3057\u3087\u3046\u3002<\/p>\n
    Java\u306eString\u306eintern()\u30e1\u30bd\u30c3\u30c9\u306f\u4f55\u3092\u3057\u307e\u3059\u304b\uff1f<\/h2>\n
    intern()\u30e1\u30bd\u30c3\u30c9\u304c\u547c\u3073\u51fa\u3055\u308c\u308b\u3068\u3001\u30d7\u30fc\u30eb\u5185\u306b\u3053\u306eString\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u7b49\u3057\u3044\u6587\u5b57\u5217\u304c\u65e2\u306b\u5b58\u5728\u3059\u308b\u5834\u5408\uff08equals\uff08Object\uff09\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u3063\u3066\u6c7a\u5b9a\u3055\u308c\u308b\uff09\u3001\u30d7\u30fc\u30eb\u304b\u3089\u305d\u306e\u6587\u5b57\u5217\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002 \u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u3001\u3053\u306eString\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30d7\u30fc\u30eb\u306b\u8ffd\u52a0\u3055\u308c\u3001\u3053\u306eString\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u53c2\u7167\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u5e38\u306b\u3001\u3053\u306eString\u3068\u540c\u3058\u5185\u5bb9\u3092\u6301\u3064String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3057\u307e\u3059\u304c\u3001\u4e00\u610f\u306e\u6587\u5b57\u5217\u306e\u30d7\u30fc\u30eb\u304b\u3089\u53d6\u5f97\u3055\u308c\u308b\u3053\u3068\u304c\u4fdd\u8a3c\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
    Java\u3067\u306eString\u306f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u3059\u304b\uff1f<\/h2>\n
    String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u4e0d\u5909\u3067\u3059\u306e\u3067\u3001\u4f5c\u6210\u5f8c\u306b\u5024\u3092\u5909\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002\u3053\u308c\u306b\u3088\u308a\u3001String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306b\u306a\u308a\u3001\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u5b89\u5168\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002Java\u306b\u304a\u3051\u308b\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u5b66\u3073\u307e\u3057\u3087\u3046\u3002<\/p>\n
    \u306a\u305cJava\u3067String\u306f\u4eba\u6c17\u306e\u3042\u308bHashMap\u306e\u30ad\u30fc\u3068\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3059\u304b\uff1f<\/h2>\n
    \u6587\u5b57\u5217\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u4e0d\u5909\u306a\u305f\u3081\u3001\u4f5c\u6210\u6642\u306b\u30cf\u30c3\u30b7\u30e5\u30b3\u30fc\u30c9\u304c\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u3001\u518d\u8a08\u7b97\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u306f\u3001\u4ed6\u306eHashMap\u306e\u30ad\u30fc\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3088\u308a\u51e6\u7406\u304c\u901f\u3044\u305f\u3081\u3001Map\u306e\u30ad\u30fc\u3068\u3057\u3066\u512a\u308c\u305f\u9078\u629e\u80a2\u3067\u3059\u3002<\/p>\n
    \u51fa\u529b\u3092\u63a8\u6e2c\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/h2>\n
    \u4ee5\u4e0b\u306eJava\u30b3\u30fc\u30c9\u30b9\u30cb\u30da\u30c3\u30c8\u306e\u51fa\u529b\u3092\u4e88\u6e2c\u3057\u3066\u3001\u81ea\u5df1\u30c6\u30b9\u30c8\u3092\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
    public<\/span> class<\/span> StringTest<\/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\tString<\/span> s1 =<\/span> new<\/span> String<\/span>(<\/span>\"digitalocean\"<\/span>)<\/span>;<\/span>\r\n   \t\tString<\/span> s2 =<\/span> new<\/span> String<\/span>(<\/span>\"DIGITALOCEAN\"<\/span>)<\/span>;<\/span>\r\n   \t\tSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>s1 =<\/span> s2)<\/span>;<\/span>\r\n   \t}<\/span>\r\n    \r\n}<\/span>\r\n<\/code><\/pre>\n
    \u51fa\u529b\u306fDIGITALOCEAN\u3067\u3059\u3002\u30b3\u30fc\u30c9\u306fString s2\u306e\u5024\u3092String s1\u306b\u5272\u308a\u5f53\u3066\u308b\u305f\u3081\u306b=\u6f14\u7b97\u5b50\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002=\u306f\u4ee3\u5165\u6f14\u7b97\u5b50\u3067\u3042\u308a\u3001(x = y)\u306e\u5f62\u5f0f\u3067y\u306e\u5024\u3092x\u306b\u5272\u308a\u5f53\u3066\u307e\u3059\u3002\u4e00\u65b9\u3001==\u306f\u6bd4\u8f03\u6f14\u7b97\u5b50\u3067\u3042\u308a\u30012\u3064\u306e\u6587\u5b57\u5217\u306e\u53c2\u7167\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u540c\u3058\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002<\/details>\n
    \n
    public<\/span> class<\/span> Test<\/span> {<\/span>\r\n    \r\n   \t public<\/span> void<\/span> foo<\/span>(<\/span>String<\/span> s)<\/span> {<\/span>\r\n   \t System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"String\"<\/span>)<\/span>;<\/span>\r\n   \t }<\/span>\r\n    \r\n   \t public<\/span> void<\/span> foo<\/span>(<\/span>StringBuffer<\/span> sb)<\/span> {<\/span>\r\n   \t System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"StringBuffer\"<\/span>)<\/span>;<\/span>\r\n   \t }<\/span>\r\n    \r\n   \t public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>\r\n   \t\tnew<\/span> Test<\/span>(<\/span>)<\/span>.<\/span>foo<\/span>(<\/span>null<\/span>)<\/span>;<\/span>\r\n   \t}<\/span>\r\n    \r\n}<\/span>\r\n<\/code><\/pre>\n
    \u51fa\u529b
    \nTest.java\u306e12\u884c\u76ee\u306e\u30a8\u30e9\u30fc\uff1afoo\u3078\u306e\u53c2\u7167\u304c\u66d6\u6627\u3067\u3059
    \nnew Test().foo(null);
    \n^
    \nTest\u5185\u306e\u30e1\u30bd\u30c3\u30c9foo(String)\u3068\u30e1\u30bd\u30c3\u30c9foo(StringBuffer)\u306e\u4e21\u65b9\u304c\u4e00\u81f4\u3057\u307e\u3059\u3053\u306e\u30b3\u30fc\u30c9\u306f\u3001foo\u306e\u4e21\u65b9\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u540c\u3058\u540d\u524d\u3067\u3042\u308a\u3001\u30e1\u30a4\u30f3\u3067\u306efoo\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u3067null\u304c\u6e21\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u3069\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u304b\u308f\u304b\u3089\u306a\u3044\u306e\u3067\u3059\u3002\u307e\u305f\u3001\u30bf\u30a4\u30d7Y\u306b\u5bfe\u3057\u3066\u30e1\u30bd\u30c3\u30c9X\u304c\u66d6\u6627\u3067\u3059\u3068\u3044\u3046\u30a8\u30e9\u30fc\u306b\u3064\u3044\u3066\u3082\u53c2\u7167\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/details>\n
    \n
    String<\/span> s1 =<\/span> new<\/span> String<\/span>(<\/span>\"abc\"<\/span>)<\/span>;<\/span>\r\nString<\/span> s2 =<\/span> new<\/span> String<\/span>(<\/span>\"abc\"<\/span>)<\/span>;<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>s1 ==<\/span> s2)<\/span>;<\/span>\r\n<\/code><\/pre>\n
    \u51fa\u529b
    \nfalse\u3053\u306e\u30b3\u30fc\u30c9\u306fnew\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u3066String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u3001\u30d2\u30fc\u30d7\u30e1\u30e2\u30ea\u5185\u306b\u4f5c\u6210\u3055\u308c\u3001s1\u3068s2\u306f\u7570\u306a\u308b\u53c2\u7167\u3092\u6301\u3061\u307e\u3059\u3002\u30c0\u30d6\u30eb\u30af\u30aa\u30fc\u30c8\u306e\u307f\u3092\u4f7f\u7528\u3057\u3066\u6587\u5b57\u5217\u3092\u4f5c\u6210\u3059\u308b\u5834\u5408\u3001\u6587\u5b57\u5217\u30d7\u30fc\u30eb\u306b\u683c\u7d0d\u3055\u308c\u3001true\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<\/details>\n
    \n
    String<\/span> s1 =<\/span> \"abc\"<\/span>;<\/span>\r\nStringBuffer<\/span> s2 =<\/span> new<\/span> StringBuffer<\/span>(<\/span>s1)<\/span>;<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>s1.<\/span>equals<\/span>(<\/span>s2)<\/span>)<\/span>;<\/span>\r\n<\/code><\/pre>\n
    \u51fa\u529b\u306ffalse\u3067\u3059\u3002\u306a\u305c\u306a\u3089\u3001s2\u306fString\u578b\u3067\u306f\u306a\u3044\u304b\u3089\u3067\u3059\u3002String\u30af\u30e9\u30b9\u306eequals()\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3067\u306f\u3001\u6e21\u3055\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30bf\u30a4\u30d7\u304cString\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092instanceof\u6f14\u7b97\u5b50\u3067\u30c1\u30a7\u30c3\u30af\u3057\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cString\u3067\u306a\u3044\u5834\u5408\u306ffalse\u3092\u8fd4\u3057\u307e\u3059\u3002<\/details>\n
    \n
    String<\/span> s1 =<\/span> \"abc\"<\/span>;<\/span>\r\nString<\/span> s2 =<\/span> new<\/span> String<\/span>(<\/span>\"abc\"<\/span>)<\/span>;<\/span>\r\ns2.<\/span>intern<\/span>(<\/span>)<\/span>;<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>s1 ==<\/span> s2)<\/span>;<\/span>\r\n<\/code><\/pre>\n
    \u51fa\u529b\u306ffalse\u3067\u3059\u3002intern()\u30e1\u30bd\u30c3\u30c9\u306f\u6587\u5b57\u5217\u30d7\u30fc\u30eb\u304b\u3089String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u53c2\u7167\u3092\u8fd4\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u30b3\u30fc\u30c9\u306f\u305d\u308c\u3092s2\u306b\u518d\u4ee3\u5165\u305b\u305a\u3001s2\u3084sos1\u3068s2\u304c\u7570\u306a\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u53c2\u7167\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002\u3082\u3057\u3001\u30b3\u30fc\u30c9\u306e3\u884c\u76ee\u3092s2 = s2.intern();\u306b\u5909\u66f4\u3059\u308b\u3068\u3001\u51fa\u529b\u306ftrue\u306b\u306a\u308a\u307e\u3059\u3002<\/details>\n
    \u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u306b\u3088\u3063\u3066\u3001\u4f55\u500b\u306eString\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u4f5c\u6210\u3055\u308c\u307e\u3059\u304b\uff1f<\/h2>\n
    String<\/span> s1 =<\/span> new<\/span> String<\/span>(<\/span>\"Hello\"<\/span>)<\/span>;<\/span>  \r\nString<\/span> s2 =<\/span> new<\/span> String<\/span>(<\/span>\"Hello\"<\/span>)<\/span>;<\/span>\r\n<\/code><\/pre>\n
    \u56de\u7b54\u306f3\u3067\u3059\u30021\u884c\u76ee\u306e\u30b3\u30fc\u30c9\u306f\u3001\u6587\u5b57\u5217\u30d7\u30fc\u30eb\u306e\u4e2d\u306b\u5024\u304cHello\u306eString\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff08\u6700\u521d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09\u3092\u4f5c\u6210\u3057\u3001\u305d\u306e\u5f8c\u3001\u30d2\u30fc\u30d7\u30e1\u30e2\u30ea\u306b\u5024\u304cHello\u306e\u65b0\u3057\u3044String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff082\u756a\u76ee\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09\u3092\u4f5c\u6210\u3057\u307e\u3059\u30022\u884c\u76ee\u306e\u30b3\u30fc\u30c9\u306f\u3001\u5024\u304cHello\u306e\u65b0\u3057\u3044String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff083\u756a\u76ee\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09\u3092\u30d2\u30fc\u30d7\u30e1\u30e2\u30ea\u306b\u4f5c\u6210\u3057\u3001\u6587\u5b57\u5217\u30d7\u30fc\u30eb\u304b\u3089Hello\u306e\u6587\u5b57\u5217\u3092\u518d\u5229\u7528\u3057\u307e\u3059\u3002<\/details>\n
    \u7d50\u8ad6<\/h2>\n
    \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001String\u306b\u3064\u3044\u3066\u7279\u306b\u95a2\u9023\u3059\u308b\u3044\u304f\u3064\u304b\u306eJava\u306e\u9762\u63a5\u306e\u8cea\u554f\u304c\u30ec\u30d3\u30e5\u30fc\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
    \u304a\u3059\u3059\u3081\u306e\u8aad\u307f\u7269:<\/p>\n
    Java\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u8cea\u554f
    \nJava\u306b\u304a\u3051\u308b\u6587\u5b57\u5217\u30d7\u30ed\u30b0\u30e9\u30e0<\/p>\n","protected":false},"excerpt":{"rendered":"
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