{"id":31460,"date":"2024-01-05T11:31:47","date_gmt":"2023-08-31T01:30:51","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e2%86%92-kotlin%e7%9a%84%e9%80%9f%e6%9f%a5%e8%a1%a8\/"},"modified":"2024-05-04T16:59:02","modified_gmt":"2024-05-04T08:59:02","slug":"java-%e2%86%92-kotlin%e7%9a%84%e9%80%9f%e6%9f%a5%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e2%86%92-kotlin%e7%9a%84%e9%80%9f%e6%9f%a5%e8%a1%a8\/","title":{"rendered":"Java \u2192 Kotlin\u7684\u901f\u67e5\u8868"},"content":{"rendered":"<h2>\u9996\u5148<\/h2>\n<p>\u8fd9\u7bc7\u6587\u7ae0\u7b80\u5355\u603b\u7ed3\u4e86\u5728\u4eceJava\u8fc1\u79fb\u5230Kotlin\u65f6\u53ef\u80fd\u4f1a\u6709\u6240\u5e2e\u52a9\u7684\u5185\u5bb9\u3002\u7531\u4e8e\u6211\u662f\u7b2c\u4e00\u6b21\u5728Qiita\u4e0a\u5199\u6587\u7ae0\uff0c\u53ef\u80fd\u5b58\u5728\u4e0d\u8db3\u4e4b\u5904\uff0c\u5e0c\u671b\u5927\u5bb6\u80fd\u591f\u6e29\u67d4\u5bf9\u5f85\u3002\u5982\u679c\u6709\u4efb\u4f55\u7591\u95ee\u6216\u5efa\u8bae\uff0c\u8bf7\u4e0d\u541d\u544a\u77e5\uff0c\u6211\u5c06\u4e0d\u80dc\u611f\u6fc0\u3002<\/p>\n<h3>\u73af\u5883<\/h3>\n<p>Java: 1.8.0_281<br \/>\nJava\uff1a1.8.0_281<\/p>\n<p>Kotlin: 1.4.20<br \/>\nKotlin\uff1a1.4.20<\/p>\n<h2>\u6574\u6570\u8f6c\u6362.parseInt\u3001\u957f\u6574\u6570\u8f6c\u6362.parseLong&#8230;<\/h2>\n<p>\u5f53\u60a8\u60f3\u8981\u5c06\u4ece\u7528\u6237\u63a5\u6536\u7684\u53c2\u6570\u8f6c\u6362\u4e3a\u6570\u5b57\u7c7b\u578b\u65f6\uff0c\u8bf7\u4f7f\u7528\u6b64\u9009\u9879\u3002<br \/>\n\u7531\u4e8e\u6b64\u9009\u9879\u672a\u5305\u542b\u9519\u8bef\u5904\u7406\uff0c\u56e0\u6b64\u5efa\u8bae\u68c0\u67e5\u53c2\u6570\u662f\u5426\u4e3a\u6570\u5b57\u7c7b\u578b\u3002<\/p>\n<h3>Java (\u53ea\u9700\u8981\u4e00\u79cd\u9009\u62e9)<\/h3>\n<pre class=\"post-pre\"><code><span class=\"nc\">String<\/span> <span class=\"n\">str<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"123\"<\/span><span class=\"o\">;<\/span>\r\n<span class=\"nc\">Int<\/span> <span class=\"n\">i<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Integer<\/span><span class=\"o\">.<\/span><span class=\"na\">parseInt<\/span><span class=\"o\">(<\/span><span class=\"n\">str<\/span><span class=\"o\">);<\/span>\r\n<span class=\"nc\">Long<\/span> <span class=\"n\">l<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Long<\/span><span class=\"o\">.<\/span><span class=\"na\">parseLong<\/span><span class=\"o\">(<\/span><span class=\"n\">str<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<h3>Kotlin\uff1a\u8bf7\u53ea\u63d0\u4f9b\u4e00\u4e2a\u9009\u9879\u8fdb\u884c\u4e2d\u6587\u91ca\u4e49\u3002<\/h3>\n<pre class=\"post-pre\"><code><span class=\"kd\">val<\/span> <span class=\"py\">str<\/span> <span class=\"p\">=<\/span> <span class=\"s\">\"123\"<\/span> <span class=\"c1\">\/\/ String<\/span>\r\n<span class=\"kd\">val<\/span> <span class=\"py\">i<\/span> <span class=\"p\">=<\/span> <span class=\"n\">str<\/span><span class=\"p\">.<\/span><span class=\"nf\">toInt<\/span><span class=\"p\">()<\/span> <span class=\"c1\">\/\/ Int<\/span>\r\n<span class=\"kd\">val<\/span> <span class=\"py\">l<\/span> <span class=\"p\">=<\/span> <span class=\"n\">str<\/span><span class=\"p\">.<\/span><span class=\"nf\">toLong<\/span><span class=\"p\">()<\/span> <span class=\"c1\">\/\/ Long<\/span>\r\n<\/code><\/pre>\n<h2>\u9a8c\u8bc1\u662f\u5426\u4e3a\u6570\u503c\u7c7b\u578b<\/h2>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5904\u7406\u7684\u662f\u4eceString\u7c7b\u578b\u5230Int\u7c7b\u578b\u7684\u8f6c\u6362\u548c\u9519\u8bef\u5904\u7406\uff0c\u4f46\u662f\u5728\u5176\u4ed6\u6570\u503c\u7c7b\u578b\u4e2d\u4e5f\u53ef\u4ee5\u4ee5\u540c\u6837\u7684\u65b9\u5f0f\u8fdb\u884c\u3002<\/p>\n<h3>Java \uff08\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879\uff09<\/h3>\n<pre class=\"post-pre\"><code><span class=\"nc\">String<\/span> <span class=\"n\">str<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"123abc\"<\/span><span class=\"o\">;<\/span>\r\n<span class=\"k\">try<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"c1\">\/\/ Int\u578b\u3078\u306e\u30ad\u30e3\u30b9\u30c8\u306b\u6210\u529f<\/span>\r\n    <span class=\"nc\">Int<\/span> <span class=\"n\">i<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Integer<\/span><span class=\"o\">.<\/span><span class=\"na\">parseInt<\/span><span class=\"o\">(<\/span><span class=\"n\">str<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span> <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">NumberFormatException<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"c1\">\/\/ Int\u578b\u3078\u306e\u30ad\u30e3\u30b9\u30c8\u304c\u5931\u6557<\/span>\r\n    <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Error!\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"na\">printStackTrace<\/span><span class=\"o\">();<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h3>Kotlin (\u53ea\u9700\u4e00\u4e2a\u9009\u9879)<\/h3>\n<pre class=\"post-pre\"><code><span class=\"kd\">val<\/span> <span class=\"py\">str<\/span> <span class=\"p\">=<\/span> <span class=\"s\">\"123abc\"<\/span> <span class=\"c1\">\/\/ String<\/span>\r\n<span class=\"kd\">val<\/span> <span class=\"py\">i<\/span> <span class=\"p\">=<\/span> <span class=\"n\">str<\/span><span class=\"p\">.<\/span><span class=\"nf\">toIntOrNull<\/span><span class=\"p\">()<\/span> <span class=\"o\">?:<\/span> <span class=\"n\">kotlin<\/span><span class=\"p\">.<\/span><span class=\"nf\">run<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c1\">\/\/ Int\u578b\u3078\u306e\u30ad\u30e3\u30b9\u30c8\u304c\u5931\u6557<\/span>\r\n    <span class=\"nf\">println<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Error!\"<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">return<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u2193 Int\u578b\u3078\u306e\u30ad\u30e3\u30b9\u30c8\u304c\u6210\u529f\u3057\u305f\u3068\u304d\u306e\u51e6\u7406<\/span>\r\n<\/code><\/pre>\n<h2>instanceof \u2192 \u7c7b\u578b\u6bd4\u8f83\u8fd0\u7b97\u7b26<\/h2>\n<h3>Java \u662f\u4e00\u79cd\u8ba1\u7b97\u673a\u7f16\u7a0b\u8bed\u8a00\u3002<\/h3>\n<pre class=\"post-pre\"><code><span class=\"nc\">String<\/span> <span class=\"n\">str<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"hogefuga\"<\/span><span class=\"o\">;<\/span>\r\n<span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">str<\/span> <span class=\"k\">instanceof<\/span> <span class=\"nc\">String<\/span><span class=\"o\">);<\/span>\r\n<span class=\"c1\">\/\/ \u2192 true<\/span>\r\n<\/code><\/pre>\n<h3>Kotlin &#8211; Kotlin<\/h3>\n<pre class=\"post-pre\"><code><span class=\"kd\">val<\/span> <span class=\"py\">str<\/span> <span class=\"p\">=<\/span> <span class=\"s\">\"hogefuga\"<\/span> <span class=\"c1\">\/\/ String<\/span>\r\n<span class=\"nf\">println<\/span><span class=\"p\">(<\/span><span class=\"n\">str<\/span> <span class=\"k\">is<\/span> <span class=\"nc\">String<\/span><span class=\"p\">)<\/span>\r\n<span class=\"c1\">\/\/ \u2192 true<\/span>\r\n<\/code><\/pre>\n<h2>instanceof \u548c\u7c7b\u578b\u8f6c\u6362\u7684\u7ec4\u5408\u6280\uff08\u667a\u80fd\u8f6c\u578b\uff09<\/h2>\n<p>\u5173\u4e8eSmartCast\uff0c\u770b\u8fd9\u91cc\u66f4\u5bb9\u6613\u7406\u89e3\u3002<\/p>\n<h3>Java \u662f\u4e00\u79cd\u5e7f\u6cdb\u4f7f\u7528\u7684\u7f16\u7a0b\u8bed\u8a00\u3002<\/h3>\n<pre class=\"post-pre\"><code><span class=\"nc\">String<\/span> <span class=\"n\">str<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"hogefuga\"<\/span><span class=\"o\">;<\/span>\r\n<span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">str<\/span> <span class=\"k\">instanceof<\/span> <span class=\"nc\">String<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"nc\">String<\/span> <span class=\"n\">msg<\/span> <span class=\"o\">=<\/span> <span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">)<\/span> <span class=\"n\">str<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"c1\">\/\/ str \u304cString\u578b\u306e\u6642<\/span>\r\n<span class=\"o\">}<\/span> <span class=\"k\">else<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"c1\">\/\/ str \u304cString\u578b\u3067\u306f\u306a\u3044\u6642<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u3082\u3057\u304f\u306f<\/span>\r\n<span class=\"k\">if<\/span> <span class=\"o\">(!(<\/span><span class=\"n\">str<\/span> <span class=\"k\">instanceof<\/span> <span class=\"nc\">String<\/span><span class=\"o\">))<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"c1\">\/\/ str \u304cString\u578b\u3067\u306f\u306a\u3044\u6642<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"c1\">\/\/ str \u304cString\u578b\u306e\u6642<\/span>\r\n<span class=\"nc\">String<\/span> <span class=\"n\">msg<\/span> <span class=\"o\">=<\/span> <span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">)<\/span> <span class=\"n\">str<\/span><span class=\"o\">;<\/span>\r\n<\/code><\/pre>\n<h3>Kotlin &#8211; Kotlin<\/h3>\n<pre class=\"post-pre\"><code><span class=\"kd\">val<\/span> <span class=\"py\">str<\/span> <span class=\"p\">=<\/span> <span class=\"s\">\"hogefuga\"<\/span> <span class=\"c1\">\/\/ String<\/span>\r\n<span class=\"k\">if<\/span> <span class=\"p\">(<\/span><span class=\"n\">str<\/span> <span class=\"k\">is<\/span> <span class=\"nc\">String<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c1\">\/\/ str \u304cString\u578b\u306e\u6642<\/span>\r\n    <span class=\"c1\">\/\/ Kotlin\u3067\u306fis\u304c\u901a\u3063\u305f\u5834\u5408\u3001\u81ea\u5206\u3067\u30ad\u30e3\u30b9\u30c8\u3057\u306a\u304f\u3066\u3082\u305d\u306e\u578b\u306b\u81ea\u52d5\u3067\u30ad\u30e3\u30b9\u30c8\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/span>\r\n<span class=\"p\">}<\/span> <span class=\"k\">else<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c1\">\/\/ str \u304cString\u578b\u3067\u306f\u306a\u3044\u6642<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n\r\n<span class=\"c1\">\/\/ \u3082\u3057\u304f\u306f<\/span>\r\n<span class=\"k\">if<\/span> <span class=\"p\">(<\/span><span class=\"n\">str<\/span> <span class=\"p\">!<\/span><span class=\"k\">is<\/span> <span class=\"nc\">String<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c1\">\/\/ str \u304cString\u578b\u3067\u306f\u306a\u3044\u6642<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c1\">\/\/ str \u304cString\u578b\u306e\u6642<\/span>\r\n<span class=\"c1\">\/\/ \u3053\u306e\u5834\u5408\u3082\u81ea\u52d5\u3067\u30ad\u30e3\u30b9\u30c8\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/span>\r\n\r\n\r\n<span class=\"c1\">\/\/ \u3053\u3093\u306a\u306e\u3082<\/span>\r\n<span class=\"c1\">\/\/ String<\/span>\r\n<span class=\"kd\">val<\/span> <span class=\"py\">msg<\/span> <span class=\"p\">=<\/span> <span class=\"n\">str<\/span> <span class=\"k\">as<\/span><span class=\"p\">?<\/span> <span class=\"nc\">String<\/span> <span class=\"o\">?:<\/span> <span class=\"n\">kotlin<\/span><span class=\"p\">.<\/span><span class=\"nf\">run<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c1\">\/\/ str \u304cString\u578b\u3067\u306f\u306a\u3044\u6642<\/span>\r\n    <span class=\"k\">return<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c1\">\/\/ str \u304cString\u578b\u306e\u6642<\/span>\r\n<\/code><\/pre>\n<h2>\u53c2\u8003\u8d44\u6599<\/h2>\n<p>\u975e\u5e38\u611f\u8c22\uff01<br \/>\n\u7c7b\u578b\u68c0\u67e5\u548c\u7c7b\u578b\u8f6c\u6362: &#8216;is&#8217; \u548c &#8216;as&#8217;: https:\/\/kotlinlang.org\/docs\/reference\/typecasts.html<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u8fd9\u7bc7\u6587\u7ae0\u7b80\u5355\u603b\u7ed3\u4e86\u5728\u4eceJava\u8fc1\u79fb\u5230Kotlin\u65f6\u53ef\u80fd\u4f1a\u6709\u6240\u5e2e\u52a9\u7684\u5185\u5bb9\u3002\u7531\u4e8e\u6211\u662f\u7b2c\u4e00\u6b21\u5728Qiita\u4e0a\u5199\u6587 [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31460","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 \u2192 Kotlin\u7684\u901f\u67e5\u8868 - 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\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/java-\u2192-kotlin\u7684\u901f\u67e5\u8868\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java \u2192 Kotlin\u7684\u901f\u67e5\u8868\" \/>\n<meta property=\"og:description\" content=\"\u9996\u5148 \u8fd9\u7bc7\u6587\u7ae0\u7b80\u5355\u603b\u7ed3\u4e86\u5728\u4eceJava\u8fc1\u79fb\u5230Kotlin\u65f6\u53ef\u80fd\u4f1a\u6709\u6240\u5e2e\u52a9\u7684\u5185\u5bb9\u3002\u7531\u4e8e\u6211\u662f\u7b2c\u4e00\u6b21\u5728Qiita\u4e0a\u5199\u6587 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java-\u2192-kotlin\u7684\u901f\u67e5\u8868\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-08-31T01:30:51+00:00\" 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