{"id":31642,"date":"2022-12-06T18:36:31","date_gmt":"2023-12-16T17:35:40","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e8%a7%84%e8%8c%83%e5%a4%87%e5%bf%98%e5%bd%95\/"},"modified":"2024-04-29T04:02:11","modified_gmt":"2024-04-28T20:02:11","slug":"java%e8%a7%84%e8%8c%83%e5%a4%87%e5%bf%98%e5%bd%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e8%a7%84%e8%8c%83%e5%a4%87%e5%bf%98%e5%bd%95\/","title":{"rendered":"Java\u89c4\u8303\u5907\u5fd8\u5f55"},"content":{"rendered":"<p>\u4e00\u4e9b\u975e\u5e38\u79c1\u4eba\u7684\u5907\u5fd8\u5f55\uff0c\u5e76\u6ca1\u6709\u6253\u7b97\u4e0e\u4ed6\u4eba\u5206\u4eab\u3002<\/p>\n<h2>\u539f\u59cb\u7c7b\u578b<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u6570\u5024\u578b\u306bunsigned\u306f\u306a\u3044<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">NaN\u3084 +0.0 \u3068 -0.0 \u306e\u6bd4\u8f03\u306e\u305f\u3081\u3001\u6d6e\u52d5\u5c0f\u6570\u70b9\u306f == \u3058\u3083\u306a\u304f\u3066 Double.compare \u3092\u4f7f\u3046<\/ul>\n<h2>\u7ee7\u627f<\/h2>\n<p>\u7ee7\u627f\u7684\u4f8b\u5b50\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">interface<\/span> <span class=\"nc\">Foo<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kt\">void<\/span> <span class=\"nf\">bar<\/span><span class=\"o\">();<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">Foo<\/span> <span class=\"kd\">extends<\/span> <span class=\"nc\">Bar<\/span> <span class=\"kd\">implements<\/span> <span class=\"nc\">Foo<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"o\">...<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h3>\u591a\u91cd\u7ee7\u627f<\/h3>\n<ul class=\"post-ul\">C++\u3068\u9055\u3063\u3066\u30af\u30e9\u30b9\u306e\u8907\u6570\u7d99\u627f\u306f\u3067\u304d\u306a\u3044<\/ul>\n<h3>\u8fd0\u7b97\u7b26<\/h3>\n<ul class=\"post-ul\">C++\u3068\u9055\u3063\u3066operator overloading\u306f\u3067\u304d\u306a\u3044<\/ul>\n<h3>\u91cd\u5199equals\u65b9\u6cd5<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u4ee5\u4e0b\u306e\u898f\u5247\u3092\u6e80\u305f\u3059\u3088\u3046\u306b\u5b9f\u88c5\u3059\u308b:<\/ul>\n<\/li>\n<\/ul>\n<p>\u53cd\u5c04\u7684 (reflexive): x.equals(x) \u306f true<br \/>\n\u5bfe\u79f0\u7684 (symmetric): y.equals(x) \u304c true \u306e\u5834\u5408\u306e\u307f\u3001x.equals(y) \u3082 true<br \/>\n\u63a8\u79fb\u7684 (transitive): x.equals(y) \u3001y.equals(z) \u304c true \u306a\u3089\u3070\u3001x.equals(z) \u3082 true<br \/>\n\u6574\u5408\u7684 (consistent): \u60c5\u5831\u304c\u5909\u66f4\u3055\u308c\u306a\u3051\u308c\u3070\u3001x.equals(y) \u306e\u7d50\u679c\u306f\u4e0d\u5909<\/p>\n<p>hashCode\u3082\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b<\/p>\n<h2>\u6700\u540e, \u6700\u7ec8, \u5b9a\u7a3f<\/h2>\n<h3>\u6700\u7ec8<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30af\u30e9\u30b9: \u7d99\u627f\u3067\u304d\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30e1\u30bd\u30c3\u30c9: \u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3067\u304d\u306a\u3044<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u5909\u6570: \u5909\u66f4\u3067\u304d\u306a\u3044<\/ul>\n<h3>\u6700\u540e<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">return, continue, break\u3084\u4f8b\u5916\u306a\u3069\u3001\u901a\u5e38\u306f\u4f55\u3092\u3084\u3063\u3066\u3082finally\u306f\u5b9f\u884c\u3055\u308c\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>\u30b9\u30ec\u30c3\u30c9\u3084VM\u304c\u7a81\u7136\u6b7b\u3093\u3060\u5834\u5408\u306f\u5b9f\u884c\u3055\u308c\u306a\u3044<br \/>\nSystem#exit \u3084 Runtime#exit \u3067\u3082\u5b9f\u884c\u3055\u308c\u306a\u3044<\/p>\n<h3>\u5b8c\u6210<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">JVM\u304c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092GC\u3059\u308b\u524d\u306b\u8d70\u3089\u305b\u308b\u30e1\u30bd\u30c3\u30c9<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Java 9\u3067deprecated\u306a\u306e\u3067\u899a\u3048\u3066\u304a\u304f\u5fc5\u8981\u306f\u306a\u3044<\/ul>\n<h2>\u4fee\u98fe\u5b50<\/h2>\n<h3>\u6458\u8981<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30af\u30e9\u30b9: abstract\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u3002instantiate\u3067\u304d\u306a\u3044\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9: \u5168\u3066\u306einterface\u306f\u975e\u660e\u793a\u7684\u306babstract\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3001abstract\u306f\u66f8\u304b\u306a\u304f\u3066\u3082\u3088\u3044<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30e1\u30bd\u30c3\u30c9: \u5b9a\u7fa9\u3092\u6301\u305f\u306a\u3044\u30e1\u30bd\u30c3\u30c9\u3002\u30af\u30e9\u30b9\u3082abstract\u3067\u306a\u3044\u3068\u3044\u3051\u306a\u3044\u3002<\/ul>\n<h3>\u53d7\u4fdd\u62a4\u7684 h\u00f9 de)<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30e1\u30bd\u30c3\u30c9\u3001\u5909\u6570\u306b\u306e\u307f\u4ed8\u4e0e\u53ef\u80fd<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u540c\u4e00\u30af\u30e9\u30b9\u3001\u30b5\u30d6\u30af\u30e9\u30b9\u304b\u3089\u53c2\u7167\u3067\u304d\u308b<\/ul>\n<h3>\u79c1\u5bc6\u7684<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092private\u306b\u3059\u308b\u3068\u305d\u306e\u30af\u30e9\u30b9\u5916\u3067\u30af\u30e9\u30b9\u3092instantiate\u3067\u304d\u306a\u304f\u306a\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>Factory Method \u30d1\u30bf\u30fc\u30f3\u3067static public\u30e1\u30bd\u30c3\u30c9\u304b\u3089\u306e\u307f\u4f5c\u308b\u306e\u306b\u4f7f\u308f\u308c\u308b\u3002<br \/>\n\u7d99\u627f\u306f\u4e0d\u53ef\u80fd\u306b\u306a\u308b<\/p>\n<h3>\u9759\u6001<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30e1\u30bd\u30c3\u30c9: \u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u306b\u306a\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u5909\u6570: \u30af\u30e9\u30b9\u5909\u6570\u306b\u306a\u308b\u3002\u30af\u30e9\u30b9\u306b1\u3064\u306b\u306a\u308a\u3001\u30af\u30e9\u30b9\u540d\u304b\u3089\u30a2\u30af\u30bb\u30b9\u53ef\u80fd<\/ul>\n<h3>\u6613\u6325\u53d1<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u306e\u305f\u3081\u3001\u30b9\u30ec\u30c3\u30c9\u9593\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u5024\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u9632\u304e\u3001\u307e\u305f\u4ee3\u5165\u51e6\u7406\u306a\u3069\u306ereoder\u3092\u9632\u3050<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u66f4\u65b0\u306b\u4f9d\u5b58\u95a2\u4fc2\u304c\u3042\u308b\u5834\u5408\u306a\u3069\u306fvolatile\u306f\u4e0d\u5341\u5206\u3067\u3001synchronized\u30d6\u30ed\u30c3\u30af\u3092\u4f7f\u308f\u306a\u3051\u308c\u3070\u3044\u3051\u306a\u3044<\/ul>\n<h2>\u73ed\u7ea7 j\u00ed)<\/h2>\n<h3>\u5916\u90e8\u7c7b<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5185\u90e8\u30af\u30e9\u30b9\u3092\u6301\u3064\u30af\u30e9\u30b9\u306e\u3053\u3068<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5916\u90e8\u30af\u30e9\u30b9\u306b\u306fstatic\u306f\u5b58\u5728\u3057\u306a\u3044<\/ul>\n<\/li>\n<\/ul>\n<p>\u5916\u90e8\u30af\u30e9\u30b9\u306b\u306fprivate\u3082\u66f8\u3051\u306a\u3044<\/p>\n<p>\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u540c\u30d1\u30c3\u30b1\u30fc\u30b8\u5185\u304b\u3089\u306e\u307f\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u3001public\u306b\u3059\u308b\u3068\u5225\u30d1\u30c3\u30b1\u30fc\u30b8\u304b\u3089\u4f7f\u3048\u308b<br \/>\npublic\u306a\u30af\u30e9\u30b9\u306f\u30d5\u30a1\u30a4\u30eb\u540d\u3082\u63c3\u3048\u308b\u5fc5\u8981\u304c\u3042\u308b<\/p>\n<h3>\u5185\u90e8\u7c7b<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5916\u90e8\u30af\u30e9\u30b9\u306b\u30cd\u30b9\u30c8\u3057\u3066\u5b9a\u7fa9\u3059\u308b\u30af\u30e9\u30b9\u3002\u5916\u90e8\u30af\u30e9\u30b9\u3067\u306a\u3044\u30af\u30e9\u30b9\u304b\u3089\u3067\u3082\u4f7f\u3048\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5916\u90e8\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089\u5185\u90e8\u30af\u30e9\u30b9\u3092instantiate\u3059\u308b\u3068\u3001\u5916\u90e8\u30af\u30e9\u30b9\u306e\u30e1\u30f3\u30d0\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u975estatic \u5185\u90e8\u30af\u30e9\u30b9\u306fstatic\u306a\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u304b\u3089instantiate\u3067\u304d\u306a\u3044<\/ul>\n<h3>\u672c\u5730\u7c7b<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5916\u90e8\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u5b9a\u7fa9\u3057\u305f\u30af\u30e9\u30b9<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u5185\u90e8\u30af\u30e9\u30b9\u306e\u4e00\u7a2e\u306a\u306e\u3067\u3001static\u306a\u30d5\u30a3\u30fc\u30eb\u30c9\u3084\u30e1\u30bd\u30c3\u30c9\u306f\u4f5c\u308c\u306a\u3044<\/ul>\n<h3>\u9759\u6001\u5185\u90e8\u7c7b b\u00f9 ji\u00e0)<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5185\u90e8\u30af\u30e9\u30b9\u3068\u5168\u304f\u6319\u52d5\u304c\u7570\u306a\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5916\u90e8\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089\u3067\u306f\u306a\u304f\u3001\u5916\u90e8\u30af\u30e9\u30b9\u304b\u3089instantiate\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u5f53\u7136\u5916\u90e8\u30af\u30e9\u30b9\u306e\u975estatic\u306a\u30e1\u30f3\u30d0\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u3002static\u306a\u3089\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b<\/ul>\n<h3>\u628a\u4e0b\u9762\u7684\u5185\u5bb9\u7528\u4e2d\u6587\u8fdb\u884c\u672c\u5730\u5316\u6539\u5199\uff0c\u53ea\u9700\u8981\u4e00\u79cd\u9009\u9879\uff1a<\/h3>\n<p>\u5b57\u7b26\u4e32<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">==: String\u306f == \u3067\u6bd4\u8f03\u3057\u3066\u306f\u3044\u3051\u306a\u3044<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">+: Java\u306e\u6587\u5b57\u5217\u9023\u7d50\u306f\u5185\u90e8\u7684\u306bStringBuilder\u3092\u4f7f\u3046\u306e\u3067\u3001+\u3067String\u3092\u9023\u7d50\u3057\u307e\u304f\u308b\u3068\u9045\u3044<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">length(): Unicode\u30b3\u30fc\u30c9\u5358\u4f4d\u306e\u6570\u3092\u8fd4\u3059\u3060\u3051\u306a\u306e\u3067\u3001\u30b5\u30ed\u30b2\u30fc\u30c8\u30da\u30a2\u3092\u542b\u3080\u3067\u671f\u5f85\u901a\u308a\u52d5\u4f5c\u3057\u306a\u3044\u3002codePointCount\u3092\u4f7f\u3046<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">String#split \u306fPattern\u3067\u306f\u306a\u304fString\u3068\u3057\u3066\u6b63\u898f\u8868\u73fe\u3092\u53d6\u308b<\/ul>\n<h3>\u6574\u6570<\/h3>\n<ul class=\"post-ul\">\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u306f\u306a\u304f Integer.valueOf(int) \u306a\u3069\u306e\u30d5\u30a1\u30af\u30c8\u30ea\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3059\u308b\u3088\u3046\u306b\u3059\u308b\u3002\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u4f7f\u3044\u56de\u3055\u308c\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u305f\u3081\u3002<\/ul>\n<h3>\u53cc\u7aef\u961f\u5217<\/h3>\n<p>\u53cc\u7aef\u961f\u5217\u3002\u7531\u4e8e\u5b9e\u73b0\u4e86\u961f\u5217\u63a5\u53e3\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f5c\u4e3a\u961f\u5217\u4f7f\u7528\uff0c\u4f46\u7531\u4e8e\u5806\u6808\u662f\u4e00\u4e2a\u7c7b\uff0c\u6240\u4ee5\u6ca1\u6709\u5b9e\u73b0\u5806\u6808\u3002\u53e6\u4e00\u65b9\u9762\uff0c\u7531\u4e8e\u5728\u5806\u6808\u7684\u6587\u6863\u4e2d\u5efa\u8bae\u4f7f\u7528\u53cc\u7aef\u961f\u5217\u800c\u4e0d\u662f\u5806\u6808\uff0c\u56e0\u6b64\u5728\u9700\u8981\u7c7b\u4f3c\u5806\u6808\u7684\u63a5\u53e3\u65f6\u5e94\u8be5\u4f7f\u7528\u53cc\u7aef\u961f\u5217\u3002\u5806\u6808\u5b9e\u73b0\u4e86Vector\uff0c\u56e0\u6b64\u53ef\u4ee5\u8bbf\u95ee\u4e0d\u5fc5\u8981\u7684\u7d22\u5f15\u3002<\/p>\n<p>\u4e00\u822c\u6765\u8bf4\uff0cLinkedList\u7684\u6240\u6709\u64cd\u4f5c\u90fd\u662f$O(1)$\u7684\uff0c\u800c\u50cfArrayDeque\u8fd9\u6837\u7684\u5b9e\u73b0\u5219\u4f1a\u6709\u6700\u574f\u60c5\u51b5\u4e0b\u7684$O(n)$\u7684\u8ffd\u52a0\u8ba1\u7b97\u65f6\u95f4\uff0c\u4f46\u6240\u6709\u64cd\u4f5c\u65f6\u95f4\u590d\u6742\u5ea6\u90fd\u53ef\u4ee5\u901a\u8fc7\u644a\u9500\u5206\u6790\u8fbe\u5230$O(1)$\u3002<\/p>\n<h3>\u7528\u4e8e\u5206\u914d\u5806\u8fde\u7eed\u7a7a\u95f4\u7684\u7c7b<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">ByteArrayOutputStream<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Buffered* (BufferedInputStream)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">ArrayList<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">String<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">StringBuilder<\/ul>\n<p>\u6ce8\u610f\u4e0d\u8981\u8fc7\u5ea6\u4f7f\u7528\u5185\u5b58\u3002<\/p>\n<h3>\u4f20\u7edf\u73ed\u7ea7<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Vector =&gt; ArrayList<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Stack =&gt; LinkedList<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">HashMap =&gt; Hashtable<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">StringBuffer =&gt; StringBuffer<\/ul>\n<h2>\u4ee5\u4e0b\u662f\u4e2d\u6587\u7684\u540c\u7fa9\u8a5e\uff1a<\/h2>\n<p>1. \u6bd4\u5c0d<br \/>\n2. \u5c0d\u7167<br \/>\n3. \u5c0d\u6bd4<br \/>\n4. \u5c0d\u7167\u4e00\u4e0b<br \/>\n5. \u6bd4\u8f03\u4e00\u4e0b<br \/>\n6. \u6bd4\u7167<\/p>\n<p>\u8acb\u9078\u64c7\u5408\u9069\u7684\u8a5e\u8a9e\u4f86\u9032\u884c\u8868\u9054\u3002<\/p>\n<p>\u5728\u5b9e\u73b0\u4efb\u610f\u7c7b\u6bd4\u8f83\u7684\u65b9\u6cd5\u4e3b\u8981\u6709\u4e24\u79cd\u65b9\u5f0f\u3002<\/p>\n<h3>Comparable.compareTo \u53ef\u4ee5\u8fdb\u884c\u6bd4\u8f83<\/h3>\n<pre class=\"post-pre\"><code><span class=\"kd\">class<\/span> <span class=\"nc\">Foo<\/span> <span class=\"kd\">implements<\/span> <span class=\"nc\">Comparable<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Foo<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kt\">int<\/span> <span class=\"n\">key<\/span><span class=\"o\">;<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"nf\">Foo<\/span><span class=\"o\">(<\/span><span class=\"kt\">int<\/span> <span class=\"n\">key<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span> \r\n        <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">key<\/span> <span class=\"o\">=<\/span> <span class=\"n\">key<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"nd\">@Override<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kt\">int<\/span> <span class=\"nf\">compareTo<\/span><span class=\"o\">(<\/span><span class=\"nc\">Foo<\/span> <span class=\"n\">f<\/span><span class=\"o\">){<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">key<\/span> <span class=\"o\">-<\/span> <span class=\"n\">f<\/span><span class=\"o\">.<\/span><span class=\"na\">key<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"nc\">Collections<\/span><span class=\"o\">.<\/span><span class=\"na\">sort<\/span><span class=\"o\">(<\/span><span class=\"n\">fooList<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">Collections<\/span><span class=\"o\">.<\/span><span class=\"na\">sort<\/span><span class=\"o\">(<\/span><span class=\"n\">fooList<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Collections<\/span><span class=\"o\">.<\/span><span class=\"na\">reverseOrder<\/span><span class=\"o\">());<\/span>\r\n<\/code><\/pre>\n<h3>\u6bd4\u8f83\u5668\u6bd4\u8f83<\/h3>\n<pre class=\"post-pre\"><code><span class=\"kd\">class<\/span> <span class=\"nc\">FooComparator<\/span> <span class=\"kd\">implements<\/span> <span class=\"nc\">Comparator<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Foo<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"nd\">@Override<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kt\">int<\/span> <span class=\"nf\">compare<\/span><span class=\"o\">(<\/span><span class=\"nc\">Foo<\/span> <span class=\"n\">a<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Foo<\/span> <span class=\"n\">b<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"n\">a<\/span><span class=\"o\">.<\/span><span class=\"na\">key<\/span> <span class=\"o\">-<\/span> <span class=\"n\">b<\/span><span class=\"o\">.<\/span><span class=\"na\">key<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"nc\">Collections<\/span><span class=\"o\">.<\/span><span class=\"na\">sort<\/span><span class=\"o\">(<\/span><span class=\"n\">fooList<\/span><span class=\"o\">,<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">FooComparator<\/span><span class=\"o\">());<\/span>\r\n<\/code><\/pre>\n<h2>\u7ebf\u7a0b<\/h2>\n<p>\u4f7f\u7528\u793a\u4f8b<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">class<\/span> <span class=\"nc\">Foo<\/span> <span class=\"kd\">implements<\/span> <span class=\"nc\">Runnable<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">run<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">while<\/span> <span class=\"o\">(<\/span><span class=\"kc\">true<\/span><span class=\"o\">)<\/span> <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">print<\/span><span class=\"o\">(<\/span><span class=\"s\">\".\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"nc\">Foo<\/span> <span class=\"n\">foo<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Foo<\/span><span class=\"o\">();<\/span>\r\n<span class=\"nc\">Thread<\/span> <span class=\"n\">thread<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Thread<\/span><span class=\"o\">(<\/span><span class=\"n\">foo<\/span><span class=\"o\">);<\/span>\r\n<span class=\"n\">thread<\/span><span class=\"o\">.<\/span><span class=\"na\">start<\/span><span class=\"o\">();<\/span>\r\n<\/code><\/pre>\n<h3>\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u7c7b<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">SimpleDateFormat<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">&#8230;<\/ul>\n<p>\u5728\u540c\u65f6\u8bbf\u95ee\u65f6\u9700\u8981\u4f7f\u7528synchronized\u7b49\u5904\u7406<\/p>\n<h2>\u4ee5\u4e0b\u662f\u4e2d\u6587\u7684\u91ca\u4e49\u9009\u9879\uff1a<\/h2>\n<p>1. \u53c2\u8003<br \/>\n2. \u5f15\u7528<br \/>\n3. \u89c2\u7167<br \/>\n4. \u7167\u7740\u505a<\/p>\n<p>\u5728\u53c2\u8003\u4e2d\u6709\u4ee5\u4e0b\u7c7b\u578b\uff1a<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Strong: \u666e\u901a\u306e\u53c2\u7167<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Weak: String reference\u304c\u306a\u304f\u306a\u308b\u3068GC\u3055\u308c\u308b\u53c2\u7167<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Soft: Weak\u3068\u9055\u3044\u5fc5\u305a\u6d88\u3048\u308b\u3068\u306f\u9650\u3089\u305a\u3001\u672c\u5f53\u306b\u30e1\u30e2\u30ea\u304c\u5fc5\u8981\u306a\u5834\u5408\u306e\u307f\u6d88\u3055\u308c\u308b\u3002GC\u306fOutOfMemoryError\u306b\u306a\u308b\u524d\u306b\u3053\u308c\u306f\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Phantom: finalize\u3092\u81ea\u5206\u3067\u30b9\u30b1\u30b8\u30e5\u30fc\u30ea\u30f3\u30b0\u3059\u308b\u305f\u3081\u306b\u4f7f\u3046 https:\/\/qiita.com\/yoshi389111\/items\/66448f9a013eee4be035<\/ul>\n<h2>\u6cdb\u578b<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30af\u30e9\u30b9\u3082\u30e1\u30bd\u30c3\u30c9\u3082\u30b8\u30a7\u30cd\u30ea\u30c3\u30af\u306b\u3067\u304d\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Primitive Type\u306f\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u3067\u304d\u306a\u3044<\/ul>\n<\/li>\n<\/ul>\n<p>? super Xxx \u3084 ? extends Xxx \u3092\u66f8\u3044\u3066 bounded type parameter \u3092\u5b9a\u7fa9\u3067\u304d\u308b<br \/>\nParameter Type\u306finstantiate\u3067\u304d\u306a\u3044<br \/>\nstatic\u306a\u30e1\u30bd\u30c3\u30c9\u3084\u5909\u6570\u306bParameter Type\u3092\u5229\u7528\u3067\u304d\u306a\u3044<\/p>\n<h2>\u6211\u8fd8\u60f3\u8c03\u67e5\u5176\u4ed6\u4e8b\u9879\u3002<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">object reflection: Class.forName \u306a\u3069<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">class loader<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">dependency injection<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u4e9b\u975e\u5e38\u79c1\u4eba\u7684\u5907\u5fd8\u5f55\uff0c\u5e76\u6ca1\u6709\u6253\u7b97\u4e0e\u4ed6\u4eba\u5206\u4eab\u3002 \u539f\u59cb\u7c7b\u578b \u6570\u5024\u578b\u306bunsigned\u306f\u306a\u3044 &nbsp; NaN\u3084 [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31642","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java\u89c4\u8303\u5907\u5fd8\u5f55 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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