{"id":31302,"date":"2023-09-12T21:07:12","date_gmt":"2023-01-10T18:13:22","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%ad%a6%e4%b9%a0java%e4%b8%ad%e7%9a%84%e5%ad%97%e9%9d%a2%e9%87%8f\/"},"modified":"2025-08-12T23:19:59","modified_gmt":"2025-08-12T15:19:59","slug":"%e5%ad%a6%e4%b9%a0java%e4%b8%ad%e7%9a%84%e5%ad%97%e9%9d%a2%e9%87%8f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%ad%a6%e4%b9%a0java%e4%b8%ad%e7%9a%84%e5%ad%97%e9%9d%a2%e9%87%8f\/","title":{"rendered":"\u5b66\u4e60Java\u4e2d\u7684\u201c\u5b57\u9762\u91cf\u201d"},"content":{"rendered":"<h3>\u76f4\u63a5\u5b57\u9762\u7684\u610f\u601d\u662f<\/h3>\n<p>\u8fd9\u662f\u6307\u5728\u6e90\u4ee3\u7801\u4e2d\u6240\u5199\u7684\u503c\u3002<br \/>\n\u5728Java\u4e2d\u6709\u56db\u79cd\u5b57\u9762\u503c\uff1a\u6574\u578b\u3001\u6d6e\u70b9\u578b\u3001\u5e03\u5c14\u578b\u548c\u5b57\u7b26\u578b\u3002<br \/>\n\u5b83\u4eec\u7684\u9ed8\u8ba4\u503c\u5206\u522b\u4e3a\uff1a<br \/>\n\u6574\u578b\u2192int<br \/>\n\u6d6e\u70b9\u578b\u2192double<br \/>\n\u5e03\u5c14\u578b\u2192boolean<br \/>\n\u5b57\u7b26\u578b\u2192char<\/p>\n<h3>\u6574\u6570\u6587\u5b57<\/h3>\n<h5>\u957f\u5f62<\/h5>\n<p>\u5982\u679c\u60f3\u628a\u9ed8\u8ba4\u7684int\u7c7b\u578b\u66ff\u6362\u4e3along\u7c7b\u578b\u5904\u7406\uff0c\u53ea\u9700\u5728\u6574\u6570\u672b\u5c3e\u6dfb\u52a0\u300cL\u300d\u6216\u300cl\u300d\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">long<\/span> <span class=\"n\">l<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">12345L<\/span><span class=\"o\">;<\/span>\r\n<\/code><\/pre>\n<h5>\u4e8c\u8fdb\u5236\u3001\u516b\u8fdb\u5236\u3001\u5341\u516d\u8fdb\u5236<\/h5>\n<p>\u5728\u5341\u8fdb\u5236\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u7528\u4e8c\u8fdb\u5236\u3001\u516b\u8fdb\u5236\u548c\u5341\u516d\u8fdb\u5236\u6765\u8fdb\u884c\u63cf\u8ff0\u3002<\/p>\n<p>\u4e8c\u8fdb\u5236\u6570\u7528\u300c0b\u300d\u4f5c\u4e3a\u524d\u7f00\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">int<\/span> <span class=\"n\">a<\/span> <span class=\"o\">=<\/span> <span class=\"mb\">0b1000001011<\/span><span class=\"o\">;<\/span>\r\n<\/code><\/pre>\n<p>\u516b\u8fdb\u5236\u6570\u2026\u2026\u4ee5\u300c0\u300d\u4e3a\u524d\u7f00\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">int<\/span> <span class=\"n\">b<\/span> <span class=\"o\">=<\/span> <span class=\"mo\">0413<\/span><span class=\"o\">;<\/span>\r\n<\/code><\/pre>\n<p>16\u8fdb\u5236\u6570\u7684\u524d\u7f00\u662f\u201c0x\u201d\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">int<\/span> <span class=\"n\">c<\/span> <span class=\"o\">=<\/span> <span class=\"mh\">0x10B<\/span><span class=\"o\">;<\/span>\r\n<\/code><\/pre>\n<h5>\u4e0b\u5212\u7ebf\u300c_\u300d<\/h5>\n<p>\u4e3a\u4e86\u4f7f\u957f\u6570\u5b57\u5b57\u9762\u503c\u66f4\u6613\u4e8e\u9605\u8bfb\uff0c\u4eceJava 7\u5f00\u59cb\u5f15\u5165\u4e86\u4f7f\u7528\u4e0b\u5212\u7ebf\u7684\u5199\u6cd5\u3002<\/p>\n<p>\u4f7f\u7528\u4e0b\u5212\u7ebf\u7684\u89c4\u5219\u6709\u4ee5\u4e0b\u4e24\u70b9\u3002<\/p>\n<p>\u53ea\u80fd\u5728\u6587\u5b57\u7684\u5f00\u5934\u548c\u7ed3\u5c3e\u8fdb\u884c\u63cf\u8ff0\u3002<br \/>\n\u4e0d\u80fd\u5728\u7b26\u53f7\uff08\u5982long\u6216float\u4e2d\u7684\u201cL\u201d\u6216\u201cF\u201d\uff0c\u5c0f\u6570\u70b9\u201c.\u201d\uff0c\u4e8c\u8fdb\u5236\u7b49\u7684\u524d\u7f00\u201c0b\u201d\u7b49\uff09\u7684\u524d\u540e\u8fdb\u884c\u63cf\u8ff0\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">int<\/span> <span class=\"n\">d<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">123_456_789<\/span><span class=\"o\">;<\/span>\r\n<\/code><\/pre>\n<h3>\u6587\u5b57\u30ea\u30c6\u30e9\u30eb\u548c\u5b57\u7b26\u4e32\u6587\u5b57\u8868\u8fbe\u5f0f<\/h3>\n<h5>\u6587\u5b57\u6587\u672c<\/h5>\n<p>\u6587\u5b57\u5b57\u9762\u503c\u662f\u7528\u4e8e\u8868\u793a\u4e00\u4e2a\u5b57\u7b26\u7684\u5b57\u9762\u503c\u3002\u4f7f\u7528char\u7c7b\u578b\u3002<br \/>\n\u6587\u5b57\u5b57\u9762\u503c\u7528\u5355\u5f15\u53f7\u62ec\u8d77\u6765\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">char<\/span> <span class=\"n\">e<\/span> <span class=\"o\">=<\/span> <span class=\"sc\">'A'<\/span><span class=\"o\">;<\/span>\r\n<\/code><\/pre>\n<h6>Unicode\u662f\u4e00\u79cd\u5b57\u7b26\u7f16\u7801\u7cfb\u7edf\u3002<\/h6>\n<p>Java\u5c06Unicode\u6307\u5b9a\u4e3a\u6807\u51c6\u5b57\u7b26\u7f16\u7801\u3002\u5728\u00a5u\u524d\u9762\u6dfb\u52a016\u8fdb\u5236\u76844\u4f4d\u6570\uff0c\u5e76\u7528\u5355\u5f15\u53f7\u62ec\u8d77\u6765\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">char<\/span> <span class=\"n\">uni<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"\u00a5u30A2\"<\/span><span class=\"o\">;<\/span>   <span class=\"c1\">\/\/\u30ab\u30bf\u30ab\u30ca\u306e\u300c\u30a2\u300d\u3092\u8868\u3059\u3002<\/span>\r\n<\/code><\/pre>\n<h6>\u6570\u503c\u7684\u8d4b\u503c<\/h6>\n<p>\u6b64\u5916\uff0c\u901a\u8fc7\u5c060~65535\uff0816\u00d716\u00d716\u00d716\uff09\u4e4b\u95f4\u7684\u6570\u503c\u8d4b\u4e88\uff0c\u4e5f\u53ef\u4ee5\u8868\u793a\u5b57\u7b26\u3002<br \/>\n\u203b\u4e0d\u80fd\u8d4b\u503c\u4e3a\u8d1f\u503c\uff01<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">char<\/span> <span class=\"n\">code<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">65<\/span><span class=\"o\">;<\/span>   <span class=\"c1\">\/\/\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8\u306e\u300cA\u300d\u3092\u8868\u3059\u3002<\/span>\r\n<\/code><\/pre>\n<p>\u4f5c\u4e3a\u7ed3\u679c\uff0c\u53ef\u4ee5\u5206\u522b\u5c06char\u578b\u7684\u53d8\u91cf\u5206\u914d\u4e3a\u4ee5\u4e0b\u4e09\u79cd\u60c5\u51b5\uff1a<br \/>\n\u2460 \u7528\u5355\u5f15\u53f7\u62ec\u8d77\u6765\u7684\u5b57\u7b26<br \/>\n\u2461 \u7528\u5355\u5f15\u53f7\u62ec\u8d77\u6765\u7684Unicode\u6570\u5b57<br \/>\n\u2462 \u4ece0\u523065535\u7684\u6570\u5b57<\/p>\n<h6>\u5bf9\u4ee5\u4e0b\u5185\u5bb9\u8fdb\u884c\u6c49\u8bed\u672c\u5730\u5316\u7684\u6539\u5199\uff0c\u53ea\u9700\u8981\u4e00\u4e2a\u9009\u9879\uff1a<\/h6>\n<p>\u65e0<\/p>\n<p>\u203bnull\u662f\u4e00\u4e2a\u5b57\u9762\u91cf\uff0c\u7528\u4e8e\u6307\u793a\u5bf9\u8c61\u5bf9\u4e8e\u5f15\u7528\u6570\u636e\u7c7b\u578b\u4e0d\u5f15\u7528\u4efb\u4f55\u5185\u5bb9\u3002\u539f\u59cb\u7c7b\u578b\u65e0\u6cd5\u4fdd\u6301\u5f15\u7528\uff0c\u56e0\u6b64\u65e0\u6cd5\u8d4b\u503c\u4e3anull\u3002<\/p>\n<h5>\u6587\u5b57\u5b57\u9762\u7684\u4e66\u9762\u8868\u8fbe<\/h5>\n<p>\u6587\u5b57\u5217\u5b57\u9762\u503c\u662f\u8868\u793a\u591a\u4e2a\u5b57\u7b26\u7ec4\u5408\u7684\u5b57\u9762\u503c\u3002\u4f7f\u7528\u7531String\u7c7b\u751f\u6210\u7684\u5bf9\u8c61\uff08\u5f15\u7528\u6570\u636e\u7c7b\u578b\uff09\u3002<br \/>\n\u6587\u5b57\u5217\u5b57\u9762\u503c\u4f7f\u7528\u53cc\u5f15\u53f7\u62ec\u8d77\u6765\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">String<\/span> <span class=\"n\">f<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"ABC\"<\/span><span class=\"o\">;<\/span>\r\n<\/code><\/pre>\n<h3>\u6d6e\u52a8\u5c0f\u6570\u70b9\u6570\u5b57\u9762\u91cf<\/h3>\n<p>\u5982\u679c\u60f3\u5c06\u9ed8\u8ba4\u7684 double \u4f5c\u4e3a float \u6765\u5904\u7406\uff0c\u53ea\u9700\u5728\u6570\u5b57\u540e\u52a0\u4e0a\u300cF\u300d\u6216\u300cf\u300d\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kt\">float<\/span> <span class=\"n\">g<\/span> <span class=\"o\">=<\/span> <span class=\"mf\">1.25<\/span><span class=\"no\">F<\/span><span class=\"o\">;<\/span>\r\n<\/code><\/pre>\n<h3>\u603b\u7ed3<\/h3>\n<p>\u611f\u8c22\u60a8\u4e00\u76f4\u4ee5\u6765\u7684\u9605\u8bfb\uff01\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u76f4\u63a5\u5b57\u9762\u7684\u610f\u601d\u662f \u8fd9\u662f\u6307\u5728\u6e90\u4ee3\u7801\u4e2d\u6240\u5199\u7684\u503c\u3002 \u5728Java\u4e2d\u6709\u56db\u79cd\u5b57\u9762\u503c\uff1a\u6574\u578b\u3001\u6d6e\u70b9\u578b\u3001\u5e03\u5c14\u578b\u548c\u5b57\u7b26\u578b\u3002 \u5b83\u4eec\u7684 [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31302","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) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5b66\u4e60Java\u4e2d\u7684\u201c\u5b57\u9762\u91cf\u201d - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e\u5b66\u4e60Java\u4e2d\u7684\u201c\u5b57\u9762\u91cf\u201d\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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