{"id":145,"date":"2023-07-29T15:42:04","date_gmt":"2022-09-10T18:39:21","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%a7%e3%82%a4%e3%83%9f%e3%83%a5%e3%83%bc%e3%82%bf%e3%83%96%e3%83%ab%e3%82%af%e3%83%a9%e3%82%b9%e3%82%92%e4%bd%9c%e6%88%90%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/"},"modified":"2025-07-31T21:08:25","modified_gmt":"2025-07-31T12:08:25","slug":"java%e3%81%a7%e3%82%a4%e3%83%9f%e3%83%a5%e3%83%bc%e3%82%bf%e3%83%96%e3%83%ab%e3%82%af%e3%83%a9%e3%82%b9%e3%82%92%e4%bd%9c%e6%88%90%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%82%a4%e3%83%9f%e3%83%a5%e3%83%bc%e3%82%bf%e3%83%96%e3%83%ab%e3%82%af%e3%83%a9%e3%82%b9%e3%82%92%e4%bd%9c%e6%88%90%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/","title":{"rendered":"Java\u3067\u30a4\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u306e\u65b9\u6cd5"},"content":{"rendered":"<h3>\u306f\u3058\u3081\u306b<\/h3>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Java\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u4e0d\u5909\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u6982\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u521d\u671f\u5316\u3055\u308c\u305f\u5f8c\u306b\u305d\u306e\u72b6\u614b\u304c\u5909\u5316\u3057\u306a\u3044\u5834\u5408\u3001\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u4e0d\u5909\uff08immutable\uff09\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001String\u306f\u4e0d\u5909\u30af\u30e9\u30b9\u3067\u3042\u308a\u3001\u4e00\u5ea6\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u751f\u6210\u3055\u308c\u308b\u3068\u3001String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5024\u306f\u5909\u308f\u308a\u307e\u305b\u3093\u3002Java\u306b\u304a\u3051\u308bString\u30af\u30e9\u30b9\u304c\u306a\u305c\u4e0d\u5909\u306a\u306e\u304b\u3001\u8a73\u3057\u304f\u5b66\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u4e0d\u5909\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u66f4\u65b0\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u72b6\u614b\u306e\u5909\u66f4\u3054\u3068\u306b\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u4e0d\u5909\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306f\u4ee5\u4e0b\u306e\u5229\u70b9\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li>An immutable class is good for caching purposes because you don\u2019t have to worry about the value changes.<\/li>\n<li>An immutable class is inherently thread-safe, so you don\u2019t have to worry about thread safety in multi-threaded environments.<\/li>\n<\/ul>\n<p>Java\u306e\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c7\u30a3\u30f3\u30b0\u306b\u3064\u3044\u3066\u3082\u3063\u3068\u5b66\u3073\u3001Java\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c7\u30a3\u30f3\u30b0\u306e\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc\u306b\u95a2\u3059\u308b\u8cea\u554f\u3092\u95b2\u89a7\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>Java\u306b\u304a\u3044\u3066\u30a4\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b<\/h2>\n<p>Java\u3067\u30a4\u30df\u30e5\u30fc\u30bf\u30d6\u30eb\u306a\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u4e00\u822c\u7684\u306a\u539f\u5247\u306b\u5f93\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30af\u30e9\u30b9\u3092\u30d5\u30a1\u30a4\u30ca\u30eb\u3068\u3057\u3066\u5ba3\u8a00\u3057\u3066\u3001\u62e1\u5f35\u3067\u304d\u306a\u304f\u3059\u308b\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u3059\u3079\u3066\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306b\u3057\u3001\u76f4\u63a5\u30a2\u30af\u30bb\u30b9\u3092\u8a31\u3055\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5909\u6570\u306b\u5bfe\u3059\u308b\u30bb\u30c3\u30bf\u30fc\u30e1\u30bd\u30c3\u30c9\u3092\u63d0\u4f9b\u3057\u306a\u3044\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5909\u66f4\u53ef\u80fd\u306a\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u3059\u3079\u3066\u30d5\u30a1\u30a4\u30ca\u30eb\u3068\u3057\u3066\u3001\u5024\u3092\u4e00\u5ea6\u3060\u3051\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u3088\u3046\u306b\u3059\u308b\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u521d\u671f\u5316\u306f\u3001\u30c7\u30a3\u30fc\u30d7\u30b3\u30d4\u30fc\u3092\u5b9f\u884c\u3059\u308b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u884c\u3046\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u30b2\u30c3\u30bf\u30fc\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30af\u30ed\u30fc\u30f3\u3092\u4f5c\u6210\u3057\u3001\u5b9f\u969b\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u53c2\u7167\u3092\u8fd4\u3055\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3002<\/ol>\n<p>\u4ee5\u4e0b\u306e\u30af\u30e9\u30b9\u306f\u3001\u30a4\u30df\u30e5\u30fc\u30bf\u30d3\u30ea\u30c6\u30a3\u306e\u57fa\u790e\u3092\u793a\u3059\u4f8b\u3067\u3059\u3002FinalClassExample\u30af\u30e9\u30b9\u306f\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u5b9a\u7fa9\u3057\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u521d\u671f\u5316\u3059\u308b\u305f\u3081\u306b\u30c7\u30a3\u30fc\u30d7\u30b3\u30d4\u30fc\u3092\u4f7f\u7528\u3059\u308b\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30e1\u30bd\u30c3\u30c9\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002FinalClassExample.java\u30d5\u30a1\u30a4\u30eb\u306emain\u30e1\u30bd\u30c3\u30c9\u306e\u30b3\u30fc\u30c9\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30a4\u30df\u30e5\u30fc\u30bf\u30d3\u30ea\u30c6\u30a3\u3092\u30c6\u30b9\u30c8\u3057\u307e\u3059\u3002<\/p>\n<p>\u300cFinalClassExample.java\u300d\u3068\u3044\u3046\u65b0\u3057\u3044\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u30b3\u30d4\u30fc\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<div>FinalClassExample.java\u306e\u6700\u7d42\u30af\u30e9\u30b9\u306e\u4f8b<\/div>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">HashMap<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Iterator<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">FinalClassExample<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n\t<span class=\"token comment\">\/\/ fields of the FinalClassExample class<\/span>\r\n\t<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">int<\/span> id<span class=\"token punctuation\">;<\/span>\r\n\t\r\n\t<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span>\r\n\t\r\n\t<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> testMap<span class=\"token punctuation\">;<\/span>\r\n\r\n\t\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> id<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> name<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token comment\">\/\/ Getter function for mutable objects<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">)<\/span> testMap<span class=\"token punctuation\">.<\/span><span class=\"token function\">clone<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token comment\">\/\/ Constructor method performing deep copy<\/span>\r\n\t\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">FinalClassExample<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> n<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> hm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Performing Deep Copy for Object initialization\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n\t\t<span class=\"token comment\">\/\/ \"this\" keyword refers to the current object<\/span>\r\n\t\t<span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>id<span class=\"token operator\">=<\/span>i<span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name<span class=\"token operator\">=<\/span>n<span class=\"token punctuation\">;<\/span>\r\n\r\n\t\t<span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> tempMap<span class=\"token operator\">=<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token class-name\">String<\/span> key<span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token class-name\">Iterator<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> it <span class=\"token operator\">=<\/span> hm<span class=\"token punctuation\">.<\/span><span class=\"token function\">keySet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">iterator<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span>it<span class=\"token punctuation\">.<\/span><span class=\"token function\">hasNext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span>\r\n\t\t\tkey<span class=\"token operator\">=<\/span>it<span class=\"token punctuation\">.<\/span><span class=\"token function\">next<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\ttempMap<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span> hm<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token punctuation\">}<\/span>\r\n\t\t<span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>testMap<span class=\"token operator\">=<\/span>tempMap<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token comment\">\/\/ Test the immutable class<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> h1 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\th1<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"1\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"first\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\th1<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"2\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"second\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token class-name\">String<\/span> s <span class=\"token operator\">=<\/span> <span class=\"token string\">\"original\"<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token keyword\">int<\/span> i<span class=\"token operator\">=<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token class-name\">FinalClassExample<\/span> ce <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">FinalClassExample<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">,<\/span>s<span class=\"token punctuation\">,<\/span>h1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token comment\">\/\/ print the ce values<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"ce id: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"ce name: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"ce testMap: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token comment\">\/\/ change the local variable values<\/span>\r\n\t\ti<span class=\"token operator\">=<\/span><span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\ts<span class=\"token operator\">=<\/span><span class=\"token string\">\"modified\"<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\th1<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"3\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"third\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token comment\">\/\/ print the values again<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"ce id after local variable change: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"ce name after local variable change: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"ce testMap after local variable change: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> hmTest <span class=\"token operator\">=<\/span> ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\thmTest<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"4\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"new\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"ce testMap after changing variable from getter methods: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066\u5b9f\u884c\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"$\">javac FinalClassExample.java<\/li>\n<li data-prefix=\"$\"><span class=\"token function\">java<\/span> FinalClassExample<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"post-conf-note\">\n<p class=\"post-conf-desc\">Note<\/p>\n<div>\u6ce8\u610f\uff1a\u30d5\u30a1\u30a4\u30eb\u306e\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u6b21\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u6ce8\u610f\uff1agetter\u30e1\u30bd\u30c3\u30c9\u304cHashMap&lt;String, String&gt;\u304b\u3089Object\u3078\u306eunchecked cast\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u305f\u3081\u3001FinalClassExample.java\u306funchecked\u307e\u305f\u306funsafe\u306a\u64cd\u4f5c\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u4f8b\u306e\u76ee\u7684\u3067\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u8b66\u544a\u3092\u7121\u8996\u3067\u304d\u307e\u3059\u3002<\/div>\n<\/div>\n<p>\u4ee5\u4e0b\u306e\u51fa\u529b\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>Performing Deep Copy for Object initialization ce id: 10 ce name: original ce testMap: {1=first, 2=second} ce id after local variable change: 10 ce name after local variable change: original ce testMap after local variable change: {1=first, 2=second} ce testMap after changing variable from getter methods: {1=first, 2=second}<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u51fa\u529b\u3092\u793a\u3059\u3068\u3001HashMap\u306e\u5024\u306f\u5909\u308f\u3063\u3066\u3044\u307e\u305b\u3093\u3002\u306a\u305c\u306a\u3089\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u304c\u30c7\u30a3\u30fc\u30d7\u30b3\u30d4\u30fc\u3092\u4f7f\u7528\u3057\u3066\u304a\u308a\u3001\u30b2\u30c3\u30bf\u30fc\u95a2\u6570\u306f\u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30af\u30ed\u30fc\u30f3\u3092\u8fd4\u3059\u304b\u3089\u3067\u3059\u3002<\/p>\n<h2>\u30c7\u30a3\u30fc\u30d7\u30b3\u30d4\u30fc\u3068\u30af\u30ed\u30fc\u30cb\u30f3\u30b0\u3092\u4f7f\u308f\u306a\u3044\u5834\u5408\u3001\u4f55\u304c\u8d77\u3053\u308b\u306e\u3067\u3059\u304b\uff1f<\/h2>\n<p>FinalClassExample.java\u30d5\u30a1\u30a4\u30eb\u306b\u5909\u66f4\u3092\u52a0\u3048\u3066\u3001\u30c7\u30a3\u30fc\u30d7\u30b3\u30d4\u30fc\u306e\u4ee3\u308f\u308a\u306b\u30b7\u30e3\u30ed\u30fc\u30b3\u30d4\u30fc\u3092\u4f7f\u7528\u3057\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u306f\u306a\u304f\u30b3\u30d4\u30fc\u3092\u8fd4\u3059\u3068\u3069\u3046\u306a\u308b\u304b\u3092\u793a\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3082\u306f\u3084\u4e0d\u5909\u3067\u306f\u306a\u304f\u3001\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u30d5\u30a1\u30a4\u30eb\u306b\u4ee5\u4e0b\u306e\u5909\u66f4\u3092\u52a0\u3048\u3066\u304f\u3060\u3055\u3044\uff08\u307e\u305f\u306f\u30b3\u30fc\u30c9\u4f8b\u304b\u3089\u30b3\u30d4\u30fc\uff06\u30da\u30fc\u30b9\u30c8\u3057\u3066\u304f\u3060\u3055\u3044\uff09\u3002<\/p>\n<ul class=\"post-ul\">\n<li>Delete the constructor method providing deep copy and add the constructor method providing shallow copy that is highlighted in the following example.<\/li>\n<li>In the getter function, delete return (HashMap&lt;String, String&gt;) testMap.clone(); and add return testMap;.<\/li>\n<\/ul>\n<p>\u4f8b\u306e\u30d5\u30a1\u30a4\u30eb\u306f\u4eca\u3001\u3053\u306e\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<div>\u30d5\u30a1\u30a4\u30ca\u30eb\u30af\u30e9\u30b9\u306e\u4f8b\u3001FinalClassExample.java<\/div>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">HashMap<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Iterator<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">FinalClassExample<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n\t<span class=\"token comment\">\/\/ fields of the FinalClassExample class<\/span>\r\n\t<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">int<\/span> id<span class=\"token punctuation\">;<\/span>\r\n\t\r\n\t<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span>\r\n\t\r\n\t<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> testMap<span class=\"token punctuation\">;<\/span>\r\n\r\n\t\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> id<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token keyword\">return<\/span> name<span class=\"token punctuation\">;<\/span>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<span class=\"token comment\">\/\/ Getter function for mutable objects<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<mark><span class=\"token keyword\">return<\/span> testMap<span class=\"token punctuation\">;<\/span><\/mark>\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n\t<mark><span class=\"token comment\">\/\/Constructor method performing shallow copy<\/span><\/mark>\r\n\r\n\t<mark><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">FinalClassExample<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> n<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> hm<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><\/mark>\r\n\t\t<mark><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"Performing Shallow Copy for Object initialization\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/mark>\r\n\t\t<mark><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>id<span class=\"token operator\">=<\/span>i<span class=\"token punctuation\">;<\/span><\/mark>\r\n\t\t<mark><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name<span class=\"token operator\">=<\/span>n<span class=\"token punctuation\">;<\/span><\/mark>\r\n\t\t<mark><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>testMap<span class=\"token operator\">=<\/span>hm<span class=\"token punctuation\">;<\/span><\/mark>\r\n\t<mark><span class=\"token punctuation\">}<\/span><\/mark>\r\n\r\n\t<span class=\"token comment\">\/\/ Test the immutable class<\/span>\r\n\r\n\t<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n\t\t<span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> h1 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\th1<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"1\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"first\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\th1<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"2\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"second\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token class-name\">String<\/span> s <span class=\"token operator\">=<\/span> <span class=\"token string\">\"original\"<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token keyword\">int<\/span> i<span class=\"token operator\">=<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token class-name\">FinalClassExample<\/span> ce <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">FinalClassExample<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">,<\/span>s<span class=\"token punctuation\">,<\/span>h1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token comment\">\/\/ print the ce values<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"ce id: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"ce name: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"ce testMap: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token comment\">\/\/ change the local variable values<\/span>\r\n\t\ti<span class=\"token operator\">=<\/span><span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\ts<span class=\"token operator\">=<\/span><span class=\"token string\">\"modified\"<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\th1<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"3\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"third\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token comment\">\/\/ print the values again<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"ce id after local variable change: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"ce name after local variable change: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"ce testMap after local variable change: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> hmTest <span class=\"token operator\">=<\/span> ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\thmTest<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"4\"<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">\"new\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\t\t\r\n\t\t<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"ce testMap after changing variable from getter methods: \"<\/span><span class=\"token operator\">+<\/span>ce<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTestMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n\t<span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066\u5b9f\u884c\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<ol>\n<li data-prefix=\"$\">javac FinalClassExample.java<\/li>\n<li data-prefix=\"$\"><span class=\"token function\">java<\/span> FinalClassExample<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u3042\u306a\u305f\u306f\u6b21\u306e\u51fa\u529b\u3092\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/div>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>Performing Shallow Copy for Object initialization ce id: 10 ce name: original ce testMap: {1=first, 2=second} ce id after local variable change: 10 ce name after local variable change: original ce testMap after local variable change: {1=first, 2=second, 3=third} ce testMap after changing variable from getter methods: {1=first, 2=second, 3=third, 4=new}<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u51fa\u529b\u7d50\u679c\u306f\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30e1\u30bd\u30c3\u30c9\u304c\u6d45\u3044\u30b3\u30d4\u30fc\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u305f\u3081\u3001HashMap\u306e\u5024\u304c\u5909\u66f4\u3055\u308c\u305f\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u30b2\u30c3\u30bf\u30fc\u95a2\u6570\u306b\u306f\u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u76f4\u63a5\u53c2\u7167\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>\u7d50\u8ad6<\/h2>\n<p>Java\u3067\u4e0d\u5909\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u969b\u306b\u306f\u3001\u30c7\u30a3\u30fc\u30d7\u30b3\u30d4\u30fc\u306e\u91cd\u8981\u6027\u3092\u542b\u3080\u4e00\u822c\u7684\u306a\u539f\u5247\u306e\u3044\u304f\u3064\u304b\u3092\u5b66\u3073\u307e\u3057\u305f\u3002\u3055\u3089\u306bJava\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u5b66\u3073\u3092\u6df1\u3081\u307e\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u306f\u3058\u3081\u306b \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Java\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u4e0d\u5909\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u6982\u8aac\u3057\u3066\u3044\u307e\u3059\u3002 \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u521d\u671f\u5316\u3055\u308c\u305f\u5f8c\u306b\u305d\u306e\u72b6\u614b\u304c\u5909\u5316\u3057\u306a\u3044\u5834\u5408\u3001\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u4e0d\u5909\uff08immutable\uff09\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001S [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-145","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast 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