{"id":921,"date":"2026-03-08T23:09:24","date_gmt":"2026-03-08T15:09:24","guid":{"rendered":"https:\/\/yunyanglib.cn\/?p=921"},"modified":"2026-03-08T23:09:25","modified_gmt":"2026-03-08T15:09:25","slug":"%e3%80%90java%e3%80%91%e6%89%93%e5%8d%b0%e6%95%b0%e7%bb%84%ef%bc%8c%e5%88%ab%e5%86%8d%e7%9b%b4%e6%8e%a5-system-out-println-%e8%b8%a9%e5%9d%91%e4%ba%86%ef%bc%81","status":"publish","type":"post","link":"https:\/\/yunyanglib.cn\/?p=921","title":{"rendered":"\u3010Java\u3011\u6253\u5370\u6570\u7ec4\uff0c\u522b\u518d\u76f4\u63a5 System.out.println \u8e29\u5751\u4e86\uff01"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e91\u626c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u65e5\u5e38 Java \u5f00\u53d1\u4e2d\uff0c<strong>\u6253\u5370\u6570\u7ec4<\/strong>\u662f\u518d\u57fa\u7840\u4e0d\u8fc7\u7684\u64cd\u4f5c\uff0c\u4f46\u7edd\u5927\u591a\u6570\u521a\u5165\u95e8\u7684\u5f00\u53d1\u8005\uff0c\u90fd\u4f1a\u8e29\u540c\u4e00\u4e2a\u7ecf\u5178\u5751\uff1a\u76f4\u63a5\u5bf9\u6570\u7ec4\u4f7f\u7528 <code>System.out.println()<\/code>\uff0c\u7ed3\u679c\u6253\u5370\u51fa\u4e00\u4e32\u5b8c\u5168\u770b\u4e0d\u61c2\u7684\u5730\u5740\u503c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4eca\u5929\u8fd9\u7bc7\u6587\u7ae0\uff0c\u5c31\u628a Java \u6253\u5370\u6570\u7ec4\u7684\u539f\u7406\u3001\u6b63\u786e\u7528\u6cd5\u3001\u89c4\u8303\u4e00\u6b21\u6027\u8bb2\u900f\uff0c\u65b0\u624b\u4e5f\u80fd\u76f4\u63a5\u7167\u7740\u7528\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u76f4\u63a5\u6253\u5370\u6570\u7ec4\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u770b\u4e00\u6bb5\u6700\u5bb9\u6613\u5199\u9519\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>String&#91;] cmowers = {\"\u6c89\u9ed8\",\"\u4e91\u626c\",\"\u4e00\u679a\u6709\u8da3\u7684\u7a0b\u5e8f\u5458\"};\n\/\/ \u9519\u8bef\u5199\u6cd5\uff1a\u76f4\u63a5\u6253\u5370\u6570\u7ec4\nSystem.out.println(cmowers);\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd0\u884c\u540e\u4f60\u4f1a\u5f97\u5230\u7c7b\u4f3c\u8fd9\u6837\u7684\u7ed3\u679c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;Ljava.lang.String@3d075dc0\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u5e76\u4e0d\u662f\u4e71\u7801\uff0c\u800c\u662f\u6709\u660e\u786e\u542b\u4e49\u7684\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>[Ljava.lang.String<\/code>\uff1a\u8868\u793a\u8fd9\u662f\u4e00\u4e2a<strong>\u5b57\u7b26\u4e32\u6570\u7ec4<\/strong>\u7684 Class \u540d\u79f0<\/li>\n\n\n\n<li><code>@<\/code> \u540e\u9762\u7684\u5341\u516d\u8fdb\u5236\u4e32\uff1a\u662f\u8be5\u6570\u7ec4\u5bf9\u8c61\u7684 <code>hashCode<\/code><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u6839\u672c\u539f\u56e0\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Java \u4e2d\u7684\u6570\u7ec4\u672c\u8d28\u662f\u5bf9\u8c61<\/strong>\uff0c\u7ee7\u627f\u81ea\u9876\u5c42\u7236\u7c7b <code>Object<\/code>\uff0c\u800c <code>Object<\/code> \u7c7b\u7684 <code>toString()<\/code> \u65b9\u6cd5\u9ed8\u8ba4\u5c31\u662f\u8f93\u51fa\u300c\u7c7b\u540d @\u54c8\u5e0c\u503c\u300d\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ Object \u7c7b\u6e90\u7801\npublic String toString() {\n    return getClass().getName() + \"@\" + Integer.toHexString(hashCode());\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u76f4\u63a5\u6253\u5370\u6570\u7ec4\uff0c\u53ea\u4f1a\u62ff\u5230\u5bf9\u8c61\u5730\u5740\uff0c\u800c\u975e\u6570\u7ec4\u5185\u5bb9\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001Java \u6253\u5370\u6570\u7ec4\u7684 4 \u79cd\u6b63\u786e\u65b9\u5f0f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u6700\u5e38\u7528\uff1aArrays.toString ()\uff08\u4e00\u7ef4\u6570\u7ec4\u9996\u9009\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>java.util.Arrays<\/code> \u5de5\u5177\u7c7b\u63d0\u4f9b\u7684 <code>toString()<\/code> \u65b9\u6cd5\uff0c\u53ef\u4ee5\u76f4\u63a5\u628a\u4efb\u610f\u7c7b\u578b\u6570\u7ec4\u8f6c\u4e3a\u53ef\u8bfb\u5b57\u7b26\u4e32\uff0c<strong>\u4e00\u884c\u4ee3\u7801\u641e\u5b9a<\/strong>\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.Arrays;\n\npublic class ArrayPrintTest {\n    public static void main(String&#91;] args) {\n        String&#91;] cmowers = {\"\u6c89\u9ed8\",\"\u4e91\u626c\",\"\u4e00\u679a\u6709\u8da3\u7684\u7a0b\u5e8f\u5458\"};\n        \/\/ \u6b63\u786e\u6253\u5370\u4e00\u7ef4\u6570\u7ec4\n        System.out.println(Arrays.toString(cmowers));\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;\u6c89\u9ed8, \u4e91\u626c, \u4e00\u679a\u6709\u8da3\u7684\u7a0b\u5e8f\u5458]\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u652f\u6301\uff1a\u57fa\u672c\u7c7b\u578b\u6570\u7ec4\uff08int\u3001double \u7b49\uff09+ \u5f15\u7528\u7c7b\u578b\u6570\u7ec4\uff0c\u901a\u7528\u53c8\u7b80\u6d01\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u57fa\u7840\u904d\u5386\uff1afor \u5faa\u73af \/for-each<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u9700\u8981\u5bf9\u6570\u7ec4\u5143\u7d20\u9010\u884c\u5904\u7406\u65f6\uff0c\u7528\u5faa\u73af\u6253\u5370\u6700\u7075\u6d3b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>String&#91;] cmowers = {\"\u6c89\u9ed8\",\"\u4e91\u626c\",\"\u4e00\u679a\u6709\u8da3\u7684\u7a0b\u5e8f\u5458\"};\n\n\/\/ 1. \u666e\u901a for \u5faa\u73af\nfor(int i = 0; i &lt; cmowers.length; i++){\n    System.out.println(cmowers&#91;i]);\n}\n\n\/\/ 2. \u589e\u5f3a for-each\uff08\u63a8\u8350\uff0c\u4ee3\u7801\u66f4\u7b80\u6d01\uff09\nfor (String s : cmowers) {\n    System.out.println(s);\n}\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. Java 8+\uff1aStream \u6d41\u6253\u5370<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528 Stream \u6d41\u5f0f\u7f16\u7a0b\uff0c\u4f18\u96c5\u7b80\u6d01\uff0c\u9002\u5408\u51fd\u6570\u5f0f\u7f16\u7a0b\u573a\u666f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.Arrays;\nimport java.util.stream.Stream;\n\npublic class ArrayStreamPrint {\n    public static void main(String&#91;] args) {\n        String&#91;] cmowers = {\"\u6c89\u9ed8\",\"\u4e91\u626c\",\"\u4e00\u679a\u6709\u8da3\u7684\u7a0b\u5e8f\u5458\"};\n\n        \/\/ \u65b9\u5f0f 1\n        Arrays.asList(cmowers).stream().forEach(s -&gt; System.out.println(s));\n        \/\/ \u65b9\u5f0f 2\n        Stream.of(cmowers).forEach(System.out::println);\n        \/\/ \u65b9\u5f0f 3\n        Arrays.stream(cmowers).forEach(System.out::println);\n    }\n}\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. \u591a\u7ef4\u6570\u7ec4\uff1aArrays.deepToString ()<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6253\u5370\u4e8c\u7ef4\u53ca\u4ee5\u4e0a\u6570\u7ec4\uff0c\u5fc5\u987b\u7528 <code>deepToString()<\/code>\uff0c\u5426\u5219\u8fd8\u662f\u4f1a\u8f93\u51fa\u5730\u5740\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.Arrays;\n\npublic class TwoDimensionalArrayPrint {\n    public static void main(String&#91;] args) {\n        String&#91;]&#91;] deepArray = new String&#91;]&#91;]{{\"\u6c89\u9ed8\", \"\u4e91\u626c\"}, {\"\u4e00\u679a\u6709\u8da3\u7684\u7a0b\u5e8f\u5458\"}};\n        \/\/ \u6253\u5370\u591a\u7ef4\u6570\u7ec4\n        System.out.println(Arrays.deepToString(deepArray));\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;&#91;\u6c89\u9ed8, \u4e91\u626c], &#91;\u4e00\u679a\u6709\u8da3\u7684\u7a0b\u5e8f\u5458]]\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001POJO \u5bf9\u8c61\u6253\u5370\u89c4\u7ea6\uff08\u5f00\u53d1\u5fc5\u770b\uff09<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9e\u9645\u9879\u76ee\u4e2d\uff0c\u6211\u4eec\u66f4\u591a\u662f\u6253\u5370<strong>\u5bf9\u8c61\u6570\u7ec4<\/strong>\uff0c\u8fd9\u91cc\u6709\u4e00\u4e2a\u5fc5\u987b\u9075\u5b88\u7684\u5f00\u53d1\u89c4\u7ea6\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>POJO \u7c7b\u5fc5\u987b\u91cd\u5199 toString () \u65b9\u6cd5<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">POJO\uff08Plain Ordinary Java Object\uff09\u7b80\u5355\u6765\u8bf4\u5c31\u662f\u666e\u901a\u5b9e\u4f53\u7c7b\uff0c\u4e0d\u7ee7\u627f \/ \u5b9e\u73b0\u4efb\u4f55\u6846\u67b6\u7c7b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u91cd\u5199 <code>toString()<\/code> \u540e\uff0c\u6253\u5370\u5bf9\u8c61\u65f6\u624d\u80fd\u770b\u5230\u5c5e\u6027\u503c\uff0c\u65b9\u4fbf\u6392\u67e5\u5f02\u5e38\u3001\u8c03\u8bd5\u4ee3\u7801\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u793a\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class User {\n    private String name;\n    private int age;\n\n    \/\/ getter\u3001setter \u7701\u7565\n\n    \/\/ \u5fc5\u987b\u91cd\u5199 toString\n    @Override\n    public String toString() {\n        return \"User{\" +\n                \"name='\" + name + '\\'' +\n                \", age=\" + age +\n                '}';\n    }\n}\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u603b\u7ed3<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u65e5\u5e38\u5f00\u53d1\u76f4\u63a5\u8bb0\u8fd9\u51e0\u6761\u5c31\u591f\u4e86\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4e00\u7ef4\u6570\u7ec4 \u2192 \u4f18\u5148\u7528 <code>Arrays.toString()<\/code><\/li>\n\n\n\n<li>\u591a\u7ef4\u6570\u7ec4 \u2192 \u56fa\u5b9a\u7528 <code>Arrays.deepToString()<\/code><\/li>\n\n\n\n<li>\u9700\u8981\u9010\u5143\u7d20\u5904\u7406 \u2192 \u7528 <code>for-each<\/code> \u6216 <code>Stream<\/code><\/li>\n\n\n\n<li>\u81ea\u5b9a\u4e49\u5bf9\u8c61\u6570\u7ec4 \u2192 \u5148\u91cd\u5199\u7c7b\u7684 <code>toString()<\/code><\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u662f\u4e91\u626c\uff0c\u540e\u7eed\u4f1a\u7ee7\u7eed\u5206\u4eab\u66f4\u591a Java \u57fa\u7840\u907f\u5751\u3001MySQL \u5b9e\u6218\u3001\u540e\u7aef\u5f00\u53d1\u5e72\u8d27\uff0c\u6b22\u8fce\u6301\u7eed\u5173\u6ce8\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e91\u626c\u3002 \u5728\u65e5\u5e38 Java \u5f00\u53d1\u4e2d\uff0c\u6253\u5370\u6570\u7ec4\u662f\u518d\u57fa\u7840\u4e0d\u8fc7\u7684\u64cd\u4f5c\uff0c\u4f46\u7edd\u5927\u591a\u6570\u521a\u5165\u95e8\u7684\u5f00\u53d1\u8005\uff0c\u90fd\u4f1a\u8e29\u540c\u4e00<\/p>\n<div class=\"more-link\">\n\t\t\t\t <a href=\"https:\/\/yunyanglib.cn\/?p=921\" class=\"link-btn theme-btn\"><span>Read More <\/span> <i class=\"fa fa-caret-right\"><\/i><\/a>\n\t\t\t<\/div>\n","protected":false},"author":1,"featured_media":924,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[15],"class_list":["post-921","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","tag-java"],"_links":{"self":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/921","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=921"}],"version-history":[{"count":2,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/921\/revisions"}],"predecessor-version":[{"id":923,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/921\/revisions\/923"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/media\/924"}],"wp:attachment":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=921"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=921"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=921"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}