{"id":31249,"date":"2023-01-18T01:11:18","date_gmt":"2023-03-07T10:09:15","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e6%95%b0%e7%bb%84-2\/"},"modified":"2025-08-12T23:03:41","modified_gmt":"2025-08-12T15:03:41","slug":"java%e6%95%b0%e7%bb%84-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e6%95%b0%e7%bb%84-2\/","title":{"rendered":"Java\u6570\u7ec4"},"content":{"rendered":"<h3>\u6570\u7ec4<\/h3>\n<p>\u6570\u7ec4\u662f\u80fd\u591f\u5c06\u591a\u4e2a\u503c\u7ec4\u5408\u5728\u4e00\u8d77\u7684\u6570\u636e\u7ed3\u6784\u3002<\/p>\n<h4>\u5b9a\u4e49\u6570\u7ec4\u53d8\u91cf<\/h4>\n<p>\u5728\u5904\u7406\u6570\u7ec4\u65f6\uff0c\u9700\u8981\u5c06\u6570\u7ec4\u8d4b\u503c\u7ed9\u6570\u7ec4\u7c7b\u578b\u7684\u53d8\u91cf\u3002<br \/>\n\u6570\u7ec4\u7684\u53d8\u91cf\u5b9a\u4e49\u53ef\u4ee5\u662fint\u7c7b\u578b\u6216String\u7c7b\u578b\u3002<\/p>\n<pre class=\"post-pre\"><code>int[]\r\nString[]\r\n<\/code><\/pre>\n<p>int\u578b\u662f\u4e00\u4e2a\u5305\u542b\u6570\u5b57\u5143\u7d20\u7684\u6570\u7ec4\u3002<br \/>\nString\u578b\u662f\u4e00\u4e2a\u5305\u542b\u5b57\u7b26\u4e32\u5143\u7d20\u7684\u6570\u7ec4\u3002String\u7684\u9996\u5b57\u6bcd\u662f\u5927\u5199\u7684\u3002<br \/>\nint\u578b\u6570\u7ec4\u7684\u4e00\u4e2a\u4f8b\u5b50\u662f<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">int<\/span><span class=\"o\">[]<\/span> <span class=\"n\">numbers<\/span> <span class=\"o\">=<\/span> <span class=\"o\">{<\/span><span class=\"mi\">1<\/span><span class=\"o\">,<\/span><span class=\"mi\">5<\/span><span class=\"o\">,<\/span><span class=\"mi\">10<\/span><span class=\"o\">};<\/span>\r\n<\/code><\/pre>\n<p>String\u7c7b\u578b\u6570\u7ec4\u7684\u793a\u4f8b<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">names<\/span> <span class=\"o\">=<\/span> <span class=\"o\">{<\/span><span class=\"s\">\"\u4f50\u85e4\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"\u9234\u6728\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"\u9ad8\u6a4b\"<\/span><span class=\"o\">};<\/span>\r\n<\/code><\/pre>\n<p>\u6570\u7ec4\u7684\u5143\u7d20\u6309\u7167\u4ece\u524d\u5230\u540e\u7684\u987a\u5e8f\u88ab\u5206\u914d\u4e86\u6570\u5b57\u201c0, 1, 2&#8230;\u201d\u3002<br \/>\n\u901a\u8fc7\u6570\u7ec4\u540d[\u7d22\u5f15\u53f7]\uff0c\u53ef\u4ee5\u83b7\u53d6\u6570\u7ec4\u7684\u6bcf\u4e2a\u5143\u7d20\u3002<br \/>\n\u4f8b\u5b50\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">names<\/span> <span class=\"o\">=<\/span> <span class=\"o\">{<\/span><span class=\"s\">\"\u4f50\u85e4\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"\u9234\u6728\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"\u9ad8\u6a4b\"<\/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=\"s\">\"\u540d\u524d\u306f\"<\/span><span class=\"o\">+<\/span><span class=\"n\">names<\/span><span class=\"o\">[<\/span><span class=\"mi\">0<\/span><span class=\"o\">]+<\/span><span class=\"s\">\"\u3067\u3059\"<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<h4>\u8986\u76d6\u6570\u7ec4\u7684\u5143\u7d20<\/h4>\n<pre class=\"post-pre\"><code><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">names<\/span> <span class=\"o\">=<\/span> <span class=\"o\">{<\/span><span class=\"s\">\"\u4f50\u85e4\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"\u9234\u6728\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"\u9ad8\u6a4b\"<\/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=\"s\">\"\u540d\u524d\u306f\"<\/span><span class=\"o\">+<\/span><span class=\"n\">names<\/span><span class=\"o\">[<\/span><span class=\"mi\">0<\/span><span class=\"o\">]+<\/span><span class=\"s\">\"\u3067\u3059\"<\/span><span class=\"o\">);<\/span>\r\n  <span class=\"n\">names<\/span><span class=\"o\">[<\/span><span class=\"mi\">0<\/span><span class=\"o\">]<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"\u4e0a\u91ce\"<\/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=\"s\">\"\u540d\u524d\u306f\"<\/span><span class=\"o\">+<\/span><span class=\"n\">names<\/span><span class=\"o\">[<\/span><span class=\"mi\">0<\/span><span class=\"o\">]+<\/span><span class=\"s\">\"\u3067\u3059\"<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>\u53ef\u4ee5\u901a\u8fc7 names[\u30a4\u30f3\u30c7\u30c3\u30af\u30b9] = &#8220;\u8981\u7d20&#8221; \u8fdb\u884c\u8986\u76d6\u3002<br \/>\n\u5728\u4e0a\u8ff0\u4f8b\u5b50\u4e2d\uff0c\u63a7\u5236\u53f0\u8f93\u51fa\u7684\u7ed3\u679c\u5c06\u4f1a\u662f \u4f50\u85e4 \u548c \u4e0a\u91ce\u3002<\/p>\n<h4>\u5bf9\u6570\u7ec4\u8fdb\u884c\u5faa\u73af\u5904\u7406<\/h4>\n<p>\u53ef\u4ee5\u4f7f\u7528for\u5faa\u73af\u6765\u8fdb\u884c\u91cd\u590d\u5904\u7406\u3002\u3010\u4f8b\u5982\u3011<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">names<\/span> <span class=\"o\">=<\/span> <span class=\"o\">{<\/span><span class=\"s\">\"\u4f50\u85e4\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"\u9234\u6728\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"\u9ad8\u6a4b\"<\/span><span class=\"o\">};<\/span>\r\n  <span class=\"k\">for<\/span> <span class=\"o\">(<\/span><span class=\"kt\">int<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><span class=\"o\">;<\/span><span class=\"n\">x<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mi\">3<\/span><span class=\"o\">;<\/span><span class=\"n\">x<\/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=\"s\">\"\u540d\u524d\u306f\"<\/span><span class=\"o\">+<\/span><span class=\"n\">names<\/span><span class=\"o\">[<\/span><span class=\"n\">x<\/span><span class=\"o\">]+<\/span><span class=\"s\">\"\u3067\u3059\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u4ece\u7d22\u5f150\u52302\u51713\u4e2a\u5143\u7d20\u4ecenames\u5217\u8868\u4e2d\u88ab\u8c03\u7528\u3002<\/p>\n<h4>\u957f\u5ea6<\/h4>\n<p>length\u662f\u4e00\u4e2a\u529f\u80fd\uff0c\u7528\u4e8e\u8ba1\u7b97\u5143\u7d20\u7684\u6570\u91cf\u3002<br \/>\n\u4f7f\u7528\u4e0a\u8ff0\u7684for\u5faa\u73af\u548clength\uff0c\u53ef\u4ee5\u8fdb\u884c\u91cd\u590d\u64cd\u4f5c\u3002<br \/>\n\u901a\u8fc7\u5c06\u5148\u524d\u7684for\u5faa\u73af\u7684\u6761\u4ef6x&lt;3\u6539\u4e3a\u6570\u7ec4.length\uff0c\u53ef\u4ee5\u8fdb\u884c\u91cd\u5199\u3002<br \/>\n\u3010\u4f8b\u3011<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">names<\/span> <span class=\"o\">=<\/span> <span class=\"o\">{<\/span><span class=\"s\">\"\u4f50\u85e4\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"\u9234\u6728\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"\u9ad8\u6a4b\"<\/span><span class=\"o\">};<\/span>\r\n  <span class=\"k\">for<\/span> <span class=\"o\">(<\/span><span class=\"kt\">int<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><span class=\"o\">;<\/span><span class=\"n\">x<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">names<\/span><span class=\"o\">.<\/span><span class=\"na\">length<\/span><span class=\"o\">;<\/span><span class=\"n\">x<\/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=\"s\">\"\u540d\u524d\u306f\"<\/span><span class=\"o\">+<\/span><span class=\"n\">names<\/span><span class=\"o\">[<\/span><span class=\"n\">x<\/span><span class=\"o\">]+<\/span><span class=\"s\">\"\u3067\u3059\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u6309\u7167\u4e0a\u8ff0\u63cf\u8ff0\u65b9\u6cd5\u8fdb\u884c\u7f16\u5199\uff0c\u5c31\u4e0d\u9700\u8981\u62c5\u5fc3\u6570\u7ec4\u7684\u5143\u7d20\u6570\u91cf\u3002\u6240\u4ee5\u6211\u8ba4\u4e3a\u8fd9\u79cd\u65b9\u6cd5\u66f4\u5bb9\u6613\u4f7f\u7528\u3002\u4f46\u662f\uff0c\u8fd8\u6709\u4e00\u79cd\u66f4\u7b80\u5355\u7684for\u5faa\u73af\uff0c\u5373\u6570\u7ec4\u7684\u6269\u5c55for\u5faa\u73af\u3002<\/p>\n<h4>for-Each \u5faa\u73af\u6765\u6269\u5c55\u6570\u7ec4<\/h4>\n<p>\u5728\u7f16\u7a0b\u4e2d\uff0c\u6211\u4eec\u6709\u4e00\u79cd\u79f0\u4e3a&#8221;\u589e\u5f3a\u578bfor\u5faa\u73af&#8221;\u7684\u8bed\u6cd5\u7ed3\u6784\uff0c\u7528\u4e8e\u904d\u5386\u6570\u7ec4\u3002\u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\uff0c\u53ef\u4ee5\u66f4\u7b80\u6d01\u5730\u7f16\u5199\u4e4b\u524d\u63d0\u5230\u7684for\u5faa\u73af\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">for<\/span> <span class=\"o\">(<\/span><span class=\"n\">\u30c7\u30fc\u30bf\u578b<\/span> <span class=\"nl\">\u5909\u6570\u540d:<\/span><span class=\"n\">\u914d\u5217\u540d<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"n\">\u7e70\u308a\u8fd4\u3059\u51e6\u7406<\/span><span class=\"o\">;<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>&#8220;I am going to the store to buy some groceries.&#8221;<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">names<\/span> <span class=\"o\">=<\/span> <span class=\"o\">{<\/span><span class=\"s\">\"\u4f50\u85e4\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"\u9234\u6728\"<\/span><span class=\"o\">,<\/span><span class=\"s\">\"\u9ad8\u6a4b\"<\/span><span class=\"o\">};<\/span>\r\n  <span class=\"k\">for<\/span> <span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"nl\">name:<\/span><span class=\"n\">names<\/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=\"s\">\"\u540d\u524d\u306f\"<\/span><span class=\"o\">+<\/span><span class=\"n\">name<\/span><span class=\"o\">+<\/span><span class=\"s\">\"\u3067\u3059\"<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u7684\u4f8b\u5b50\u4e2d\uff0cString\u662f\u6570\u636e\u7c7b\u578b\uff0cname\u662f\u53d8\u91cf\u540d\uff0c\u800cnames\u662f\u6570\u7ec4\u540d\u3002<br \/>\n\u4e0e\u4e4b\u524d\u6240\u7528\u7684\u57fa\u4e8elength\u7684for\u5faa\u73af\u76f8\u6bd4\uff0c\u62d3\u5c55for\u5faa\u73af\u4e2d\uff0c\u6570\u7ec4\u7684\u5143\u7d20\u76f4\u63a5\u8d4b\u503c\u7ed9\u4e86\u53d8\u91cf\u3002<br \/>\n\u867d\u7136\u6211\u5199\u5f97\u6709\u70b9\u5570\u55e6\uff0c\u4f46\u6211\u8ba4\u4e3a\u8fd9\u662f\u6700\u65b9\u4fbf\u4f7f\u7528\u7684\u65b9\u5f0f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6570\u7ec4 \u6570\u7ec4\u662f\u80fd\u591f\u5c06\u591a\u4e2a\u503c\u7ec4\u5408\u5728\u4e00\u8d77\u7684\u6570\u636e\u7ed3\u6784\u3002 \u5b9a\u4e49\u6570\u7ec4\u53d8\u91cf \u5728\u5904\u7406\u6570\u7ec4\u65f6\uff0c\u9700\u8981\u5c06\u6570\u7ec4\u8d4b\u503c\u7ed9\u6570\u7ec4\u7c7b\u578b\u7684\u53d8\u91cf\u3002  [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31249","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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