{"id":1873,"date":"2020-10-12T15:24:40","date_gmt":"2020-10-12T07:24:40","guid":{"rendered":"http:\/\/122.152.205.50\/wordpress\/?p=1873"},"modified":"2025-02-14T22:12:16","modified_gmt":"2025-02-14T14:12:16","slug":"kotlin%e4%b8%8ejava%e8%af%ad%e6%b3%95%e5%8c%ba%e5%88%ab%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"http:\/\/xinyiworld.top\/wordpress_it\/?p=1873","title":{"rendered":"Kotlin\u4e0eJava\u8bed\u6cd5\u533a\u522b\u603b\u7ed3"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_16 counter-hierarchy counter-decimal ez-toc-grey\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">\u76ee\u5f55<\/p>\n<span class=\"ez-toc-title-toggle\"><a class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/a><\/span><\/div>\n<nav><ul class=\"ez-toc-list ez-toc-list-level-1\"><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"http:\/\/xinyiworld.top\/wordpress_it\/?p=1873\/#%E4%BC%98%E7%82%B9\" title=\"\u4f18\u70b9\">\u4f18\u70b9<\/a><ul class=\"ez-toc-list-level-4\"><li class=\"ez-toc-heading-level-4\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"http:\/\/xinyiworld.top\/wordpress_it\/?p=1873\/#%E7%B1%BB\" title=\"\u7c7b\">\u7c7b<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-4\"><a class=\"ez-toc-link ez-toc-heading-3\" href=\"http:\/\/xinyiworld.top\/wordpress_it\/?p=1873\/#%E4%BD%8D%E8%BF%90%E7%AE%97\" title=\"\u4f4d\u8fd0\u7b97\">\u4f4d\u8fd0\u7b97<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-4\"><a class=\"ez-toc-link ez-toc-heading-4\" href=\"http:\/\/xinyiworld.top\/wordpress_it\/?p=1873\/#%E5%85%B3%E9%94%AE%E5%AD%97\" title=\"\u5173\u952e\u5b57\">\u5173\u952e\u5b57<\/a><\/li><\/ul><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-5\" href=\"http:\/\/xinyiworld.top\/wordpress_it\/?p=1873\/#%E7%BC%BA%E7%82%B9\" title=\"\u7f3a\u70b9\">\u7f3a\u70b9<\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"%E4%BC%98%E7%82%B9\"><\/span>\u4f18\u70b9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p>\u652f\u6301\u6587\u4ef6\u7ea7\u522b\u7684\u51fd\u6570\u3001\u53d8\u91cf\u58f0\u660e<\/p>\n<\/li>\n<li>\n<p>\u884c\u5c3e\u4e0d\u9700\u8981\u5206\u53f7 <\/p>\n<\/li>\n<li>\n<p>\u5173\u952e\u5b57\u533a\u522b<br \/>\nvar    \u53d8\u91cf      val    \u5e38\u91cf<\/p>\n<\/li>\n<\/ul>\n<p>\u5e38\u91cf\u7684\u53e6\u5916\u4e00\u79cd\u8868\u8fbe\u65b9\u5f0f\uff1a<\/p>\n<pre><code>companion object {\n    const val hello: String = &quot;HELLO&quot;\n}<\/code><\/pre>\n<ul>\n<li>\u7c7b\u578b\u5b9a\u4e49<br \/>\n\u53d8\u91cf\u3001\u51fd\u6570\u8fd4\u56de\u503c\u3001\u53c2\u6570\u7c7b\u578b\uff0c\u90fd\u662f\u5728\u540e\u9762\u52a0\u4e0a\uff1a\u7c7b\u578b\u3002<\/li>\n<\/ul>\n<p>\u53d8\u91cf\u53ef\u4ee5\u4e0d\u52a0\u7c7b\u578b\uff0c\u8d4b\u503c\u7684\u65f6\u5019\u4f1a\u81ea\u52a8\u5224\u65ad\u3002<\/p>\n<p>\u6570\u7ec4\u7684\u7c7b\u578b\u4e0d\u662f&quot;\u7c7b\u578b[]&quot;\uff0c\u800c\u662f\u4f7f\u7528\u7c7b&quot;Array&lt;\u7c7b\u578b&gt;&quot;\u6765\u5b9a\u4e49\u6570\u7ec4<\/p>\n<p>\u53ef\u7a7a\u7c7b\u578b:\u53d8\u91cf\u540e+?\u8868\u793a\u53d8\u91cf\u662f\u53ef\u7a7a\u7c7b\u578b\uff0c\u53ef\u4ee5\u8d4b\u503c\u4e3anull\u3002<\/p>\n<ul>\n<li>\n<p>\u65b9\u6cd5\u5b9a\u4e49<br \/>\n\u91c7\u7528fun\u5173\u952e\u5b57<\/p>\n<\/li>\n<li>\n<p>\u5b57\u7b26\u4e32\u6a21\u677f<\/p>\n<pre><code>$varName \u8868\u793a\u53d8\u91cf\u503c\n${varName.fun()} \u8868\u793a\u53d8\u91cf\u7684\u65b9\u6cd5\u8fd4\u56de\u503c<\/code><\/pre>\n<\/li>\n<li>\n<p>\u53bb\u6389\u4e0d\u5fc5\u8981\u7684\u6a21\u677f\u4ee3\u7801<br \/>\n\u5982<\/p>\n<pre><code>fun maxOf(a: Int, b: Int) = if (a &gt; b) a else b<\/code><\/pre>\n<p>\u7b49\u4ef7\u4e8e<\/p>\n<pre><code>fun maxOf(a: Int, b: Int): Int {\nif (a &gt; b) {\n    return a\n} else {\n    return b\n}\n}<\/code><\/pre>\n<p>\u4f46\u662f\u6ca1\u6709\u4e86{}\u3001return\uff0c\u66f4\u52a0\u7b80\u6d01\u3002<\/p>\n<\/li>\n<li>\n<p>null\u68c0\u6d4b<br \/>\n\u4e00\u822c\u53d8\u91cf\u503c\u3001\u65b9\u6cd5\u53c2\u6570\u548c\u65b9\u6cd5\u8fd4\u56de\u503c\u7b49\u51e1\u662f\u6709\u8d4b\u503c\u7684\u5730\u65b9\uff0c\u9ed8\u8ba4\u90fd\u4e0d\u80fd\u8fd4\u56denull\u3002\u5982\u679c\u8981\u8fd4\u56denull\uff0c\u9700\u8981\u5728\u7c7b\u578b\u540e\u9762\u52a0\u4e0a?<br \/>\n<a href=\"https:\/\/www.proyy.com\/6959738939141783589.html\">https:\/\/www.proyy.com\/6959738939141783589.html<\/a><\/p>\n<\/li>\n<li>\n<p>\u7c7b\u578b\u68c0\u6d4b\u4e0e\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362<br \/>\nis<\/p>\n<\/li>\n<li>\n<p>when\u8868\u8fbe\u5f0f<br \/>\n\u7c7b\u4f3c\u4e8eswitch\u8868\u8fbe\u5f0f<br \/>\n<a href=\"https:\/\/blog.csdn.net\/guoxinyu1207\/article\/details\/100031824\">https:\/\/blog.csdn.net\/guoxinyu1207\/article\/details\/100031824<\/a><\/p>\n<\/li>\n<li>\n<p>\u533a\u95f4<br \/>\nin\u4e0e..<\/p>\n<\/li>\n<li>\n<p>\u6269\u5c55\u5c5e\u6027<\/p>\n<\/li>\n<li>\n<p>kotlin \u7ebf\u7a0b\u57fa\u7840    <a href=\"https:\/\/www.jianshu.com\/p\/a684118c1b98\">https:\/\/www.jianshu.com\/p\/a684118c1b98<\/a> <\/p>\n<\/li>\n<li>\n<p>kotlin\u4e2dwhile\u6761\u4ef6\u4e2d\u4e0d\u80fd\u5b58\u5728\u8d4b\u503c\u8bed\u53e5\uff0c\u5426\u5219\u62a5\u9519 <\/p>\n<\/li>\n<li>\n<p>\u5982\u4f55startActivity   <a href=\"https:\/\/blog.csdn.net\/l465659833\/article\/details\/73322588\/\">https:\/\/blog.csdn.net\/l465659833\/article\/details\/73322588\/<\/a> <\/p>\n<\/li>\n<li>\n<p>\u533f\u540d\u5185\u90e8\u7c7b   <a href=\"https:\/\/blog.csdn.net\/gongjdde\/article\/details\/77451424\">https:\/\/blog.csdn.net\/gongjdde\/article\/details\/77451424<\/a><\/p>\n<\/li>\n<\/ul>\n<p>\u8c03\u7528\u5916\u90e8\u7c7b\u7684this\uff0c<code>this@\u5916\u90e8\u7c7b\u7c7b\u540d<\/code><\/p>\n<ul>\n<li>return\u66f4\u52a0\u7cbe\u786e<br \/>\nreturn@xx\uff0c\u53ef\u4ee5\u6307\u5b9areturn\u7684\u5177\u4f53\u4f4d\u7f6e\u3002<\/li>\n<\/ul>\n<h4><span class=\"ez-toc-section\" id=\"%E7%B1%BB\"><\/span>\u7c7b<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>\u4e0ejava\u7c7b\u5927\u4e0d\u4e00\u6837<\/p>\n<ul>\n<li>\u79c1\u6709\u53d8\u91cf\u4f1a\u81ea\u52a8\u751f\u6210set\/get\u65b9\u6cd5<\/li>\n<li>\u5bf9\u8c61\u4e0d\u9700\u8981new<\/li>\n<li>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cKotlin \u7c7b\u662f\u6700\u7ec8\uff08final\uff09\u7684\uff1a\u5b83\u4eec\u4e0d\u80fd\u88ab\u7ee7\u627f\u3002 \u8981\u4f7f\u4e00\u4e2a\u7c7b\u53ef\u7ee7\u627f\uff0c\u8bf7\u7528 open \u5173\u952e\u5b57\u6807\u8bb0\u5b83\u3002<\/li>\n<li>\u83b7\u53d6\u5b57\u8282\u7801<br \/>\n<a href=\"https:\/\/blog.csdn.net\/fly7632785\/article\/details\/79863049\">https:\/\/blog.csdn.net\/fly7632785\/article\/details\/79863049<\/a><\/li>\n<li>\u5b9a\u4e49\u9759\u6001\u65b9\u6cd5<br \/>\n<a href=\"https:\/\/blog.csdn.net\/qq_37080185\/article\/details\/114531221\">https:\/\/blog.csdn.net\/qq_37080185\/article\/details\/114531221<\/a><\/li>\n<\/ul>\n<p><a href=\"https:\/\/blog.csdn.net\/qq_37080185\/article\/details\/114531221\">https:\/\/blog.csdn.net\/qq_37080185\/article\/details\/114531221<\/a><\/p>\n<ul>\n<li>\n<p>\u63a5\u53e3\u5b9e\u73b0<br \/>\n<a href=\"https:\/\/blog.csdn.net\/qq_37299249\/article\/details\/79946269\">https:\/\/blog.csdn.net\/qq_37299249\/article\/details\/79946269<\/a><\/p>\n<pre><code>\/\/\u5bf9\u8c61\u83b7\u53d6\nperson.javaClass\/\/ javaClass\nperson::class.java \/\/ javaClass\n\/\/\u7c7b\u83b7\u53d6\nPerson::class\/\/ kClass\nperson.javaClass.kotlin\/\/ kClass\n(Person::class as Any).javaClass\/\/ javaClass\nPerson::class.java \/\/ javaClass<\/code><\/pre>\n<\/li>\n<li>\n<p>\u5bf9\u8c61\u5c5e\u6027\u8c03\u7528<br \/>\n?.\u8868\u793a\u5f53\u524d\u5bf9\u8c61\u5982\u679c\u4e3a\u7a7a\u5219\u4e0d\u6267\u884c\uff0c\u53ef\u4ee5\u7701\u53bb\u5f88\u591a\u7684if\u975e\u7a7a\u5224\u65ad<br \/>\n!!.\u8868\u793a\u5f53\u524d\u5bf9\u8c61\u5982\u679c\u4e3a\u7a7a\u4e5f\u6267\u884c\uff0c\u7136\u540e\u4f1a\u629b\u51fa\u7a7a\u5f02\u5e38<\/p>\n<\/li>\n<li>\n<p>\u7ee7\u627f\u7c7b<\/p>\n<\/li>\n<\/ul>\n<p>\u65b9\u5f0f1\uff1a<br \/>\n\uff1a\u7c7b\u540d()<\/p>\n<p>\u65b9\u5f0f2\uff1a<br \/>\n\u8fd8\u6709\u4e00\u79cd\u5f62\u5f0f\uff0c\u7c7b\u540d\u4e0d\u52a0\u6784\u9020\u65b9\u6cd5\uff0c\u5728\u7c7b\u91cc\u9762\u58f0\u660e\u6784\u9020\u65b9\u6cd5\u3002<\/p>\n<pre><code>class MaskFilterCustomView : View{\n    constructor(context: Context, attributeSet: AttributeSet): super(context,attributeSet)\n\n}<\/code><\/pre>\n<ul>\n<li>\n<p>startActivity<br \/>\n<a href=\"https:\/\/blog.csdn.net\/qq_33210042\/article\/details\/108831613\">https:\/\/blog.csdn.net\/qq_33210042\/article\/details\/108831613<\/a><\/p>\n<\/li>\n<li>\n<p>\u5355\u4f8b\u5b9e\u73b0<br \/>\n<a href=\"https:\/\/blog.csdn.net\/fulai00\/article\/details\/144192503\">https:\/\/blog.csdn.net\/fulai00\/article\/details\/144192503<\/a><\/p>\n<\/li>\n<li>\n<p>\u63a5\u53e3\u56de\u8c03<br \/>\n<a href=\"https:\/\/blog.csdn.net\/weixin_39534002\/article\/details\/117764811\">https:\/\/blog.csdn.net\/weixin_39534002\/article\/details\/117764811<\/a><\/p>\n<\/li>\n<\/ul>\n<h4><span class=\"ez-toc-section\" id=\"%E4%BD%8D%E8%BF%90%E7%AE%97\"><\/span>\u4f4d\u8fd0\u7b97<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><a href=\"https:\/\/blog.csdn.net\/u010428110\/article\/details\/106824749\">https:\/\/blog.csdn.net\/u010428110\/article\/details\/106824749<\/a><\/p>\n<h4><span class=\"ez-toc-section\" id=\"%E5%85%B3%E9%94%AE%E5%AD%97\"><\/span>\u5173\u952e\u5b57<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li>\n<p>as<br \/>\n\u7c7b\u578b\u8f6c\u6362<br \/>\njava\u4e2d\u7684<\/p>\n<pre><code class=\"language-java\">\uff08ParameterizedType\uff09type<\/code><\/pre>\n<p>\u8f6c\u6362\u6210kotlin\u5c31\u662f<\/p>\n<pre><code>type as ParameterizedType<\/code><\/pre>\n<\/li>\n<li>\n<p>\u7ebf\u7a0b\u76f8\u5173\u7684\u5173\u952e\u5b57<br \/>\nvolatile\u3001syncronized\u7b49\u5173\u952e\u5b57\uff0c\u5728kotlin\u91cc\u7528@Volatile\u3001@Syncronized\u8868\u793a\u3002<\/p>\n<\/li>\n<li>\n<p>object<br \/>\n<a href=\"https:\/\/blog.csdn.net\/weixin_47933729\/article\/details\/128654496\">https:\/\/blog.csdn.net\/weixin_47933729\/article\/details\/128654496<\/a><\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"%E7%BC%BA%E7%82%B9\"><\/span>\u7f3a\u70b9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u57fa\u672c\u7c7b\u578b\u6ca1\u6709\u9690\u5f0f\u62d3\u5bbd\u8f6c\u6362\uff0c\u53ea\u80fd\u901a\u8fc7\u65b9\u6cd5\u663e\u793a\u62d3\u5bbd\u3002<\/p>\n<ul>\n<li>\u6ca1\u6709\u4e09\u5143\u8fd0\u7b97\u7b26<br \/>\n<a href=\"https:\/\/blog.51cto.com\/u_13633\/6697063\">https:\/\/blog.51cto.com\/u_13633\/6697063<\/a><\/li>\n<\/ul>\n<button class=\"simplefavorite-button\" data-postid=\"1873\" data-siteid=\"1\" data-groupid=\"1\" data-favoritecount=\"0\" style=\"\">\u6536\u85cf <i class=\"sf-icon-star-empty\"><\/i><\/button>","protected":false},"excerpt":{"rendered":"<p>\u76ee\u5f55 \u4f18\u70b9\u7c7b\u4f4d\u8fd0\u7b97\u5173\u952e\u5b57\u7f3a\u70b9 \u4f18\u70b9 \u652f\u6301\u6587\u4ef6\u7ea7\u522b\u7684\u51fd\u6570\u3001\u53d8\u91cf\u58f0\u660e \u884c\u5c3e\u4e0d\u9700\u8981\u5206\u53f7 \u5173\u952e\u5b57\u533a\u522b var [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[57],"tags":[],"_links":{"self":[{"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=\/wp\/v2\/posts\/1873"}],"collection":[{"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1873"}],"version-history":[{"count":41,"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=\/wp\/v2\/posts\/1873\/revisions"}],"predecessor-version":[{"id":15562,"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=\/wp\/v2\/posts\/1873\/revisions\/15562"}],"wp:attachment":[{"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1873"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1873"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/xinyiworld.top\/wordpress_it\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1873"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}