{"id":1011,"date":"2017-08-26T15:36:00","date_gmt":"2017-08-26T07:36:00","guid":{"rendered":"https:\/\/www.ray650128.com\/wordpress\/?p=1011"},"modified":"2021-09-05T13:04:48","modified_gmt":"2021-09-05T05:04:48","slug":"android%e5%96%ae%e4%be%8b%e6%a8%a1%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/blog.ray650128.com\/?p=1011","title":{"rendered":"[Android]\u55ae\u4f8b\u6a21\u5f0f"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u4ec0\u9ebc\u662f\u55ae\u4f8b\u6a21\u5f0f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u55ae\u4f8b\u6a21\u5f0f\u662f\u4e00\u7a2e\u8a2d\u8a08\u6a21\u5f0f\uff0c\u76ee\u7684\u662f\u70ba\u4e86\u78ba\u4fdd\u67d0\u500b\u985e\u5225\u53ea\u6709\u4e00\u500b\u5be6\u4f8b\uff0c\u4e26\u81ea\u884c\u5be6\u4f8b\u5316\u4e14\u6574\u500b\u7cfb\u7d71\u90fd\u53ef\u4ee5\u8a2a\u554f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u55ae\u4f8b\u6a21\u5f0f\u7684\u9069\u7528\u5834\u666f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u63d0\u4f9b\u5168\u57df\u53ef\u4ee5\u8a2a\u554f\u7684\u5c0d\u8c61(\u4f8b\u5982\u53ef\u4ee5\u7528\u4f5c\u5168\u57df\u8b8a\u6578\u4f7f\u7528)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5de5\u5177\u985e\u5225<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8017\u8cbb\u8cc7\u6e90\u7684\u5c0d\u8c61(\u4f8b\u5982\u547c\u53ebweb api\u3001\u8cc7\u6599\u5eab\u9023\u63a5\u7ba1\u7406)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Java\u7684\u5be6\u73fe\u65b9\u5f0f<\/h2>\n\n\n\n<ol class=\"wp-block-list\"><li>\u5ba3\u544a\u4e00\u500b\u540d\u70bainstance\u7684\u7269\u4ef6<\/li><li>\u547c\u53ebgetInstance()\u65b9\u6cd5\u7684\u6642\u5019\uff0c\u5982\u679cinstance = null\u5247\u5be6\u4f8b\u5316\u4e00\u500b\u81ea\u5df1<\/li><li>\u9032\u884c\u5be6\u4f8b\u5316\u7684\u5efa\u69cb\u5f0f\u5fc5\u9808\u662f\u79c1\u6709\u7684(private)\uff0c\u9632\u6b62\u88ab\u5176\u4ed6\u4eba\u91cd\u8907\u5be6\u4f8b\u5316\u3002<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u7a0b\u5f0f\u78bc\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java line-numbers\">public class Singleton {\n    private Singleton() {}\n\n    private static Singleton instance;\n\n    public static Singleton getInstance() {\n        if (instance == null) instance = new Singleton();\n        return instance;\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0a\u662fJava\u55ae\u4f8b\u6a21\u5f0f\u7c21\u55ae\u7684\u5be6\u73fe\u65b9\u5f0f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u5982\u679c\u5728\u591a\u57f7\u884c\u7dd2\u7684\u60c5\u5883\u4e0b\u8a2a\u554f\u8a72\u7269\u4ef6\uff0c\u53ef\u80fd\u6703\u767c\u751f\u8cc7\u6599\u4e0d\u540c\u6b65\u7684\u554f\u984c\uff0c\u56e0\u6b64\u6211\u5011\u53ef\u4ee5\u9019\u6a23\u6539\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java line-numbers\">public class Singleton {\n    private Singleton() {}\n\n    private static Singleton instance = null;\n\n    private synchronized static void createInstance() {\n        if (instance == null) instance = new Singleton();\n    }\n\n    public static Singleton getInstance() {\n        if (instance == null) createInstance();\n        return instance;\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\uff0c\u5728\u5be6\u4f8b\u5316\u7684\u6642\u5019\u4f7f\u7528<a rel=\"noreferrer noopener\" href=\"https:\/\/codertw.com\/%E7%A8%8B%E5%BC%8F%E8%AA%9E%E8%A8%80\/319743\/\" data-type=\"URL\" data-id=\"https:\/\/codertw.com\/%E7%A8%8B%E5%BC%8F%E8%AA%9E%E8%A8%80\/319743\/\" target=\"_blank\">synchronized\u4fee\u98fe\u8a5e<\/a>\u4f86\u4fdd\u8b77createInstance()\u9019\u500b\u65b9\u6cd5\uff0c\u4fdd\u8b49\u540c\u4e00\u6642\u9593\u53ea\u6709\u4e00\u500b\u57f7\u884c\u7dd2\u547c\u53eb\u8a72\u65b9\u6cd5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0a\u5c31\u662fJava\u5be6\u73fe\u55ae\u4f8b\u6a21\u5f0f\u7684\u65b9\u5f0f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Kotlin\u7684\u5be6\u73fe\u65b9\u5f0f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Kotlin\u7684\u5be6\u73fe\u65b9\u5f0f\u5c31\u5f88\u7c21\u55ae\u4e86\uff0c\u53ea\u9700\u8981\u7528object\u95dc\u9375\u5b57\u5ba3\u544a\u5c31\u53ef\u4ee5\u5be6\u73fe\u55ae\u4f8b\u6a21\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"kotlin\" class=\"language-kotlin line-numbers\">object Singleton() {\n\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728Kotlin\u5b98\u65b9\u6587\u4ef6\u4e2d\uff0c\u9019\u7a2e\u505a\u6cd5\u4e5f\u53eb\u505a<a rel=\"noreferrer noopener\" href=\"https:\/\/kotlinlang.org\/docs\/object-declarations.html#object-declarations-overview\" data-type=\"URL\" data-id=\"https:\/\/kotlinlang.org\/docs\/object-declarations.html#object-declarations-overview\" target=\"_blank\">Object declarations<\/a>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8b93\u6211\u5011\u4f86\u53cd\u7de8\u8b6f\u770b\u770b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9996\u5148\u9ede\u9078Android Studio\u7684Tool menu->Kotlin->Show Kotlin Bytecode<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u63a5\u8457\u5728\u53f3\u5074Kotlin Bytecode\u8996\u7a97\u4e2d\uff0c\u6309\u4e0bDecompile<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u5f8c\u5c31\u6703\u5f97\u5230\u53cd\u7de8\u8b6f\u6210Java\u539f\u59cb\u78bc\u7684\u7d50\u679c\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">public final class Singleton {\n   public static final Singleton INSTANCE;\n\n   private Singleton() {\n      INSTANCE = (Singleton)this;\n   }\n\n   static {\n      new Singleton();\n   }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u600e\u9ebc\u6a23\uff0c\u662f\u4e0d\u662f\u8ddfJava\u4e00\u6a21\u4e00\u6a23\u5462\uff5e<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e8b\u5be6\u4e0a\uff0cobject\u5be6\u969b\u4e0a\u4e5f\u662f\u5efa\u7acb\u4e86\u552f\u4e00\u7684\u5be6\u4f8b\uff0c\u53ea\u4e0d\u904e\u662f\u7531Kotlin\u81ea\u52d5\u5e6b\u4f60\u5b8c\u6210\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4ec0\u9ebc\u662f\u55ae\u4f8b\u6a21\u5f0f \u55ae\u4f8b\u6a21\u5f0f\u662f\u4e00\u7a2e\u8a2d\u8a08\u6a21\u5f0f\uff0c\u76ee\u7684\u662f\u70ba\u4e86\u78ba\u4fdd\u67d0\u500b\u985e\u5225\u53ea\u6709\u4e00\u500b\u5be6\u4f8b\uff0c\u4e26\u81ea\u884c\u5be6\u4f8b\u5316\u4e14\u6574\u500b\u7cfb\u7d71\u90fd\u53ef\u4ee5\u8a2a\u554f\u3002 &hellip; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[32],"class_list":["post-1011","post","type-post","status-publish","format-standard","hentry","category-2","tag-32"],"_links":{"self":[{"href":"https:\/\/blog.ray650128.com\/index.php?rest_route=\/wp\/v2\/posts\/1011","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.ray650128.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.ray650128.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.ray650128.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.ray650128.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1011"}],"version-history":[{"count":2,"href":"https:\/\/blog.ray650128.com\/index.php?rest_route=\/wp\/v2\/posts\/1011\/revisions"}],"predecessor-version":[{"id":1013,"href":"https:\/\/blog.ray650128.com\/index.php?rest_route=\/wp\/v2\/posts\/1011\/revisions\/1013"}],"wp:attachment":[{"href":"https:\/\/blog.ray650128.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1011"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.ray650128.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1011"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.ray650128.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1011"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}