{"id":31281,"date":"2023-07-16T21:41:34","date_gmt":"2023-06-23T16:11:22","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e7%94%a8jshell%e5%bc%80%e5%a7%8b%e5%ad%a6%e4%b9%a0java-%e4%b8%80%e7%aa%a5java%e7%9a%84%e4%b8%96%e7%95%8c\/"},"modified":"2025-08-12T23:13:44","modified_gmt":"2025-08-12T15:13:44","slug":"%e7%94%a8jshell%e5%bc%80%e5%a7%8b%e5%ad%a6%e4%b9%a0java-%e4%b8%80%e7%aa%a5java%e7%9a%84%e4%b8%96%e7%95%8c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e7%94%a8jshell%e5%bc%80%e5%a7%8b%e5%ad%a6%e4%b9%a0java-%e4%b8%80%e7%aa%a5java%e7%9a%84%e4%b8%96%e7%95%8c\/","title":{"rendered":"\u7528JShell\u5f00\u59cb\u5b66\u4e60Java &#8211; \u4e00\u7aa5Java\u7684\u4e16\u754c"},"content":{"rendered":"<p>\u8ba9\u6211\u4eec\u5728JShell\u4e0a\u5f00\u59cb\u5b66\u4e60Java\u5427\u3002<\/p>\n<h2>\u4e3a\u4e86\u4ec0\u4e48\u800c\u505a\u6ca1\u6709\u7f16\u7a0b\u7ecf\u9a8c\u7684\u4eba\u80fd\u591f\u5927\u81f4\u7406\u89e3Java\u7f16\u7a0b\u4e2d\u6d89\u53ca\u7684\u5404\u79cd\u6982\u5ff5\u3002<\/p>\n<p>\u57fa\u4e8e\u8fd9\u7bc7\u6587\u7ae0\u7684\u5185\u5bb9\uff0c\u5df2\u7ecf\u51fa\u7248\u4e86\u201c\u6210\u4e3a\u4e13\u4e1aJava\u5f00\u53d1\u8005\u201d\u7684\u4e66\u7c4d\u3002<\/p>\n<h2>\u73af\u5883\u8bbe\u7f6e\u9996\u5148\u4ece\u73af\u5883\u8bbe\u7f6e\u5f00\u59cb\u3002<br \/>\n\u60a8\u53ef\u4ee5\u4ece\u4ee5\u4e0b\u94fe\u63a5\u4e0b\u8f7dJDK\u3002<br \/>\nhttp:\/\/jdk.java.net\/18\/<\/p>\n<p>\u6211\u8ba4\u4e3a\u5bf9\u4e8e\u4e0d\u719f\u6089\u547d\u4ee4\u884c\u7684\u4eba\u6765\u8bf4\uff0c\u4f7f\u7528Adoptium\u63d0\u4f9b\u7684\u5e26\u6709\u5b89\u88c5\u7a0b\u5e8f\u7684\u8f6f\u4ef6\u5305\u4f1a\u66f4\u597d\u3002\u4e5f\u53ef\u4ee5\u9009\u62e917LTS\u7248\u672c\u3002<br \/>\nhttps:\/\/adoptium.net\/<br \/>\n\u5bf9\u4e8eMac\u548cLinux\u7528\u6237\u6765\u8bf4\uff0c\u53ef\u4ee5\u4e0b\u8f7dtar.gz\u6587\u4ef6\u6765<\/p>\n<pre class=\"post-pre\"><code>$ tar xf openjdk-18_mac-x64_bin.tar.gz\r\n<\/code><\/pre>\n<p>\u6211\u8ba4\u4e3a\u8fd9\u4e2a\u4e5f\u53ef\u4ee5\u3002\u5728Windows\u4e0a\uff0c\u60a8\u53ef\u4ee5\u4e0b\u8f7dZIP\u6587\u4ef6\u5e76\u5c06\u5176\u89e3\u538b\u5230\u9002\u5f53\u7684\u6587\u4ef6\u5939\u4e2d\u3002<\/p>\n<h2>\u542f\u52a8JShell\u73b0\u5728\u8ba9\u6211\u4eec\u5c1d\u8bd5\u542f\u52a8JShell\u3002<br \/>\n\u4f7f\u7528Windows\u7684\u670b\u53cb\uff0c\u8bf7\u6253\u5f00&#8221;\u547d\u4ee4\u63d0\u793a\u7b26&#8221;\uff0c\u800c\u4f7f\u7528Mac\u6216Linux\u7684\u670b\u53cb\uff0c\u8bf7\u6253\u5f00&#8221;\u7ec8\u7aef&#8221;\u3002<\/p>\n<pre class=\"post-pre\"><code>$ jshell\r\n<\/code><\/pre>\n<p>\u5982\u679c\u5b83\u542f\u52a8\u4e86\u5c31\u5f88\u5e78\u8fd0<\/p>\n<p>\u987a\u4fbf\u8bf4\u4e00\u53e5\uff0c$ jshell \u662f\u6307\u5728\u547d\u4ee4\u884c\u4e2d\u8f93\u5165 jshell \u7136\u540e\u6309\u4e0b[enter]\u952e\u7684\u683c\u5f0f\u3002<\/p>\n<p>\u5982\u679c\u4e0d\u80fd\u542f\u52a8\uff0c\u5bf9\u4e8eWindows\u7cfb\u7edf\uff0c\u8bf7\u5c1d\u8bd5\u542f\u52a8&#8221;\\Program files\\Eclipse Adoptium\\jdk-18-hotspot\\bin\\jshell&#8221;\u3002\u5728\u8f93\u5165&#8221;\\Prog&#8221;\u540e\u6309\u4e0b [tab] \u952e\u4f1a\u81ea\u52a8\u8865\u5168\u3002<br \/>\n\u203b \u5bf9\u4e8eWindows\u7cfb\u7edf\uff0c\u8bf7\u4f7f\u7528\u53cd\u659c\u6760\\\u8f93\u5165\u4e3a\uffe5\u3002<br \/>\n\u5bf9\u4e8eMac\u7cfb\u7edf\uff0c\u8bf7\u5c1d\u8bd5\u5728\/Library\/Java\/jdk-18\/Contents\/Home\/bin\/jshell\u9644\u8fd1\u542f\u52a8\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/15-0.png\" alt=\"image.png\" \/><\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/16-0.png\" alt=\"image.png\" \/>\u5f53\u4f60\u5728JShell\u4e2d\u8f93\u5165\u4efb\u4f55\u5185\u5bb9\u5e76\u6309\u4e0b[Enter]\u952e\uff0cJShell\u4f1a\u5c06\u8be5\u8f93\u5165\u89e3\u91ca\u4e3aJava\u4ee3\u7801\u5e76\u6267\u884c\u3002\u8fd9\u6b21\u8f93\u5165\u7684\u53ea\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u8ba1\u7b97\uff0c\u4f46\u5b83\u4ecd\u7136\u662fJava\u7a0b\u5e8f\u7684\u4e00\u90e8\u5206\u3002<br \/>\n\u56e0\u6b64\uff0c\u6211\u4eec\u7684\u7b2c\u4e00\u4e2aJava\u7a0b\u5e8f\u53d8\u6210\u4e8612 + 23\u3002\u592a\u68d2\u4e86\uff01<\/p>\n<p>\u4ee5\u540e\uff0c\u5c06\u4ee5\u4ee5\u4e0b\u65b9\u5f0f\u8868\u793a\u5bf9jshell\u7684\u8f93\u5165\u548c\u7ed3\u679c\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; 12 + 23\r\n$1 ==&gt; 35\r\n<\/code><\/pre>\n<p>\u8bf7\u5728JShell\u4e2d\u8f93\u516512+23\u5e76\u6309\u4e0b[enter]\u952e\uff0c\u8fd9\u6837\u5c31\u4f1a\u663e\u793a35\u3002\u6682\u65f6\u4e0d\u5fc5\u8003\u8651$1 == &gt; \u90e8\u5206\u3002<\/p>\n<h2>\u5904\u7406\u503c<\/p>\n<h3>\u8fd0\u7b97\u521a\u624d\u8fdb\u884c\u4e86\u52a0\u6cd5\u8fd0\u7b97\u3002\u90a3\u4e48\u63a5\u4e0b\u6765\u8bd5\u8bd5\u51cf\u6cd5\u5427\uff1f\u6211\u6765\u8bd5\u4e00\u4e0b4\u51cf3\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; 4 - 3\r\n$2 ==&gt; 1\r\n<\/code><\/pre>\n<p>\u5728\u6570\u5b66\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528*\u6765\u8868\u793a\u4e58\u6cd5\uff0c\/\u6765\u8868\u793a\u9664\u6cd5\u3002\u6b64\u5916\uff0c\u6211\u4eec\u53ef\u4ee5\u7528%\u6765\u8ba1\u7b97\u9664\u6cd5\u7684\u4f59\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; 8 * 2\r\n$3 ==&gt; 16\r\n\r\njshell&gt; 8 \/ 2\r\n$4 ==&gt; 4\r\n\r\njshell&gt; 7 % 5\r\n$5 ==&gt; 2\r\n<\/code><\/pre>\n<p>3+4*2\u662f\u600e\u4e48\u6837\u7684\u5462\uff1f<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; 3 + 4 * 2\r\n$6 ==&gt; 11\r\n<\/code><\/pre>\n<p>\u5bf9\u4e0d\u8d77\uff0c\u6211\u53ea\u80fd\u4ee5\u82f1\u6587\u56de\u7b54\u60a8\u7684\u95ee\u9898\u3002\u8bf7\u6ce8\u610f\uff0c\u4ee5\u4e0b\u662f\u5bf9\u53e5\u5b50\u7684\u4e00\u79cd\u7ffb\u8bd1\uff0c\u53ef\u80fd\u4f1a\u6709\u8bf8\u591a\u8868\u8fbe\u65b9\u5f0f\u3002\u4e2d\u6587\u7ffb\u8bd1\u5982\u4e0b\uff1a<\/p>\n<p>\u55ef\uff0c\u4e58\u6cd5\u5148\u8ba1\u7b97\u4e86\u3002\u5982\u679c\u7528\u62ec\u53f7\u62ec\u8d77\u67653+4\uff0c\u5c31\u4f1a\u5148\u8ba1\u7b97\u52a0\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; (3 + 4) * 2\r\n$7 ==&gt; 14\r\n<\/code><\/pre>\n<h3>\u5404\u79cd\u5404\u6837\u7684\u7c7b\u578b (k\u00e8 g\u00e8 de\u987a\u4fbf\u95ee\u4e00\u4e0b\uff0c\u5173\u4e8e22\/7\u7684\u4e8b\u60c5\u4f1a\u5982\u4f55\u53d1\u5c55\u5462\uff1f<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; 22 \/ 7\r\n$8 ==&gt; 3\r\n<\/code><\/pre>\n<p>\u5f53\u8fdb\u884c\u8ba1\u7b97\u65f6\uff0c\u88ab\u89c6\u4e3a\u4e00\u4e2a\u6574\u6570\u3002\u82e5\u60f3\u8981\u5c0f\u6570\u70b9\u540e\u7684\u7ed3\u679c\uff0c\u4e5f\u5c31\u662f\u5e0c\u671b\u4ee5\u5b9e\u6570\u7684\u5f62\u5f0f\u8fdb\u884c\u8ba1\u7b97\uff0c\u53ef\u4ee5\u4f7f\u752822.0\/7\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; 22.0 \/ 7\r\n$9 ==&gt; 3.142857142857143\r\n<\/code><\/pre>\n<p>\u5728Java\u4e2d\uff0c\u5982\u679c\u7ed9\u6570\u5b57\u52a0\u4e0a\u5c0f\u6570\u70b9\uff0c\u5b83\u5c31\u4f1a\u88ab\u89c6\u4e3a\u5b9e\u6570\u3002\u53e6\u5916\uff0c\u5982\u679c\u8fd0\u7b97\u7684\u4efb\u4e00\u9879\u662f\u5b9e\u6570\uff0c\u8ba1\u7b97\u4e5f\u4f1a\u4ee5\u5b9e\u6570\u8fdb\u884c\u3002\u56e0\u6b64\uff0c\u5728Java\u4e2d\uff0c\u6574\u6570\u548c\u5b9e\u6570\u662f\u6709\u533a\u522b\u7684\uff0c\u8ba1\u7b97\u65b9\u5f0f\u4e5f\u4e0d\u540c\u3002<\/p>\n<h3>\u6587\u672c\u5b57\u7b26\u4e32\u548c\u65b9\u6cd5 h\u00e9\u8fc4\u4eca\u70ba\u6b62\uff0c\u6211\u5011\u4e00\u76f4\u5728\u8655\u7406\u6578\u5b57\u3002\u5728\u7a0b\u5f0f\u4e2d\uff0c\u6211\u5011\u4e5f\u7d93\u5e38\u8655\u7406\u9023\u7e8c\u7684\u5b57\u7b26\uff0c\u4f8b\u5982\u55ae\u8a5e\u3001\u53e5\u5b50\u7b49\u7b49\u3002\u5728\u7a0b\u5f0f\u7684\u4e16\u754c\u4e2d\uff0c\u9019\u7a2e\u9023\u7e8c\u7684\u5b57\u7b26\u88ab\u7a31\u70ba\u5b57\u7b26\u4e32\u3002\u5728Java\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u96d9\u5f15\u865f\u5c07\u5b57\u7b26\u4e32\u62ec\u8d77\u4f86\u8868\u793a\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; \"aaa\"\r\n$10 ==&gt; \"aaa\"\r\n<\/code><\/pre>\n<h4>\u65b9\u6cd5\u5bf9\u4e8e\u5b57\u7b26\u4e32\uff0c\u6211\u4eec\u4f1a\u60f3\u8981\u6267\u884c\u5404\u79cd\u64cd\u4f5c\u3002\u4f8b\u5982\uff0c\u8ba9\u6211\u4eec\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u5b57\u6bcd\u3002\u8f93\u5165&#8221;test&#8221;.toUpperCase()\u8fdb\u884c\u5c1d\u8bd5\u3002\u8f93\u5165\u5230 &#8220;toU&#8221; \u7136\u540e\u6309\u4e0b [Tab] \u952e\uff0c\u5e94\u8be5\u4f1a\u81ea\u52a8\u8865\u5168\u3002\u8fd9\u79cd\u529f\u80fd\u79f0\u4e3a &#8220;\u81ea\u52a8\u8865\u5168&#8221;\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; \"test\".toUpperCase()\r\n$12 ==&gt; \"TEST\"\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/43-0.png\" alt=\"image.png\" \/><\/p>\n<div>\n<div class=\"post-table\">\u30e1\u30bd\u30c3\u30c9\u7528\u9014length()\u6587\u5b57\u5217\u306e\u9577\u3055\u3092\u53d6\u5f97repeat(n)\u6587\u5b57\u5217\u3092n\u56de\u7e70\u308a\u8fd4\u3059replace(old, new)\u6587\u5b57\u5217\u4e2d\u306eold\u3092new\u306b\u7f6e\u304d\u63db\u3048\u308bcharAt(index)index\u756a\u76ee\u306e\u6587\u5b57\u3092\u53d6\u308a\u51fa\u3059substring(begin, end)\u6587\u5b57\u5217\u306ebegin\u756a\u76ee\u304b\u3089end\u756a\u76ee\u306e\u624b\u524d\u307e\u3067\u3092\u629c\u304d\u51fa\u3059toUpperCase()\u6587\u5b57\u5217\u3092\u5927\u6587\u5b57\u306b\u3059\u308btoLowerCase()\u6587\u5b57\u5217\u3092\u5c0f\u6587\u5b57\u306b\u3059\u308b\u8ba9\u6211\u4eec\u5c1d\u8bd5\u4f7f\u7528\u5176\u4ed6\u65b9\u6cd5\u3002\u8bf7\u6267\u884c&#8221;test&#8221;.repeat(3)\u7684\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; \"test\".repeat(3)\r\n$13 ==&gt; \"testtesttest\"\r\n<\/code><\/pre>\n<p>\u6d4b\u8bd5\u91cd\u590d\u4e863\u6b21\u7684\u5b57\u7b26\u4e32\u88ab\u663e\u793a\u51fa\u6765\u4e86\u3002repeat\u65b9\u6cd5\u662f\u4e00\u4e2a\u6307\u5b9a\u5b57\u7b26\u4e32\u91cd\u590d\u6b21\u6570\u7684\u65b9\u6cd5\u3002\u5c31\u50cf\u8fd9\u6837\uff0c\u6709\u65f6\u5019\u6211\u4eec\u9700\u8981\u5411\u65b9\u6cd5\u63d0\u4f9b\u4e00\u4e9b\u7279\u5b9a\u7684\u503c\u3002\u8fd9\u4e9b\u7279\u5b9a\u7684\u503c\u79f0\u4e3a&#8221;\u53c2\u6570\uff08\u5f15\u6570\uff09&#8221;\u3002<\/p>\n<p>\u5728charAt\u65b9\u6cd5\u4e2d\uff0c\u60a8\u53ef\u4ee5\u63d0\u53d6\u6307\u5b9a\u4f4d\u7f6e\u7684\u5b57\u7b26\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; \"test\".charAt(2)\r\n$13 ==&gt; 's'\r\n<\/code><\/pre>\n<p>\u5728\u8fd9\u91cc\uff0c\u9700\u8981\u6ce8\u610f\u7684\u662f\u7b2c\u4e00\u4e2a\u5b57\u7b26\u662f0\u53f7\u3002\u5728\u7a0b\u5e8f\u4e2d\uff0c\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c0\u8868\u793a\u7b2c\u4e00\u4e2a\u5143\u7d20\uff0c1\u8868\u793a\u7b2c\u4e8c\u4e2a\u5143\u7d20\u3002<\/p>\n<p>\u518d\u6765\u4e00\u4e2a\u4f8b\u5b50\uff0c\u6211\u4eec\u8bd5\u7740\u4f7f\u7528replace\u65b9\u6cd5\u3002\u8ba9\u6211\u4eec\u6267\u884c&#8221;test&#8221;.replace(&#8220;st&#8221;,&#8221;&#8221;)\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; \"test\".replace(\"st\",\"\")\r\n$14 ==&gt; \"te\"\r\n<\/code><\/pre>\n<p>replace\uff08\u66ff\u6362\uff09\u65b9\u6cd5\u662f\u4e00\u4e2a\u7528\u4e8e\u66ff\u6362\u5b57\u7b26\u4e32\u7684\u65b9\u6cd5\uff0c\u5b83\u63a5\u53d7\u66ff\u6362\u524d\u7684\u5b57\u7b26\u4e32\u548c\u66ff\u6362\u540e\u7684\u5b57\u7b26\u4e32\u4f5c\u4e3a\u53c2\u6570\u3002\u5f53\u6709\u4e24\u4e2a\u6216\u66f4\u591a\u53c2\u6570\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u9017\u53f7\u6765\u5206\u9694\u53c2\u6570\u3002&#8221;&#8221;\u4ee3\u8868\u7a7a\u5b57\u7b26\u4e32\u3002\u901a\u8fc7\u5c06&#8221;st&#8221;\u66ff\u6362\u4e3a&#8221;&#8221;\uff0c\u6211\u4eec\u5c06\u4ece\u5b57\u7b26\u4e32\u4e2d\u7701\u7565\u4e86&#8221;st&#8221;\u3002<\/p>\n<p>\u60a8\u8fd8\u53ef\u4ee5\u5c06\u65b9\u6cd5\u8c03\u7528\u8fde\u63a5\u8d77\u6765\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; \"test\".repeat(3).replace(\"st\",\"\")\r\n$15 ==&gt; \"tetete\"\r\n<\/code><\/pre>\n<p>&#8220;test&#8221;\u91cd\u590d3\u6b21\u6210\u4e3a&#8221;testtesttest&#8221;\uff0c\u5e76\u4e14\u7701\u7565\u4e86&#8221;st&#8221;\u53d8\u6210\u4e86&#8221;tetete&#8221;\u3002<\/p>\n<p>\u7ec3\u4e60\uff1a\u4f7f\u7528repeat\u65b9\u6cd5\u521b\u5efa\u4e00\u4e2a\u91cd\u590d\u56db\u6b21\u7684\u5b57\u7b26\u4e32&#8221;hi&#8221;\u3002<br \/>\n\u7ec3\u4e60\uff1a\u4f7f\u7528replace\u65b9\u6cd5\u5c06&#8221;grape&#8221;\u7684\u5b57\u6bcdp\u66ff\u6362\u4e3ad\u3002<br \/>\n\u7ec3\u4e60\uff1a\u4f7f\u7528toLowerCase\u65b9\u6cd5\u5c06&#8221;HELLO&#8221;\u8f6c\u6362\u4e3a\u5c0f\u5199\u3002<br \/>\n\u7ec3\u4e60\uff1a\u4f7f\u7528substring\u65b9\u6cd5\u4ece&#8221;minute&#8221;\u4e2d\u63d0\u53d6\u7b2c\u4e8c\u4e2a\u5b57\u7b26\u5f00\u59cb\u7684\u4e09\u4e2a\u5b57\u7b26\uff0c\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<p>\u5728\u4e2d\u6587\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u201c+\u201d\u8fd0\u7b97\u7b26\u6765\u8fde\u63a5\u5b57\u7b26\u4e32\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; \"te\" + \"st\"\r\n$11 ==&gt; \"test\"\r\n<\/code><\/pre>\n<p>\u5bf9\u4e8e\u51cf\u6cd5\uff0c\u4f1a\u600e\u6837\u5462\uff1f\u5982\u679c\u7528&#8221;test&#8221;\u51cf\u53bb&#8221;st&#8221;\u5f97\u5230&#8221;te&#8221;\uff0c\u90a3\u4e48\u5c31\u5f88\u65b9\u4fbf\u4e86\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; \"test\" - \"st\"\r\n|  \u30a8\u30e9\u30fc:\r\n|  \u4e8c\u9805\u6f14\u7b97\u5b50'-'\u306e\u30aa\u30da\u30e9\u30f3\u30c9\u578b\u304c\u4e0d\u6b63\u3067\u3059\r\n|    \u6700\u521d\u306e\u578b: java.lang.String\r\n|    2\u756a\u76ee\u306e\u578b: java.lang.String\r\n|  \"test\" - \"st\"\r\n|  ^-----------^\r\n<\/code><\/pre>\n<p>\u53d1\u751f\u4e86\u9519\u8bef\u3002\u8fd9\u91cc\u6240\u8bf4\u7684 &#8220;\u64cd\u4f5c\u6570&#8221; \u662f\u6307\u8fd0\u7b97\u7b26\u7684\u9879\u3002\u5b83\u6307\u51fa &#8211; \u8fd0\u7b97\u7b26\u4e0d\u80fd\u7528\u4e8e\u5b57\u7b26\u4e32\u3002\u5e0c\u671b\u60a8\u80fd\u6b63\u786e\u9605\u8bfb\u8fd9\u6837\u7684\u9519\u8bef\u4fe1\u606f\uff0c\u4f46\u76ee\u524d\u5bf9\u4e8e &#8211; \u8fd0\u7b97\u7b26\u4e0d\u80fd\u7528\u4e8e\u5b57\u7b26\u4e32\u7684\u8ba4\u8bc6\u5c31\u591f\u4e86\u3002\u5bf9\u4e8e\u5b57\u7b26\u4e32\uff0c\u53ea\u80fd\u4f7f\u7528 + \u8fd0\u7b97\u7b26\u4f5c\u4e3a\u8fd0\u7b97\u7b26\u3002<\/p>\n<h4>\u64cd\u4f5cJShell\u5f53\u4f60\u6309\u4e0a\u65b9\u5411\u952e\u65f6\uff0c\u5148\u524d\u8f93\u5165\u7684\u5185\u5bb9\u5c06\u4f1a\u51fa\u73b0\u3002\u8fd9\u5bf9\u4e8e\u60f3\u8981\u518d\u6b21\u6267\u884c\u5148\u524d\u8f93\u5165\u7684\u5185\u5bb9\u7684\u60c5\u51b5\u975e\u5e38\u6709\u7528\u3002<\/p>\n<p>\u8981\u7ed3\u675fJShell\uff0c\u53ef\u4ee5\u4f7f\u7528\/exit\u547d\u4ee4\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; \/exit\r\n|  \u7d42\u4e86\u3057\u307e\u3059\r\n\r\n$\r\n<\/code><\/pre>\n<p>\u5982\u679c\u5728JShell\u4e2d\uff0c\u5f53\u6309\u4e0b[Enter]\u952e\u65f6\uff0c\u53ef\u4ee5\u786e\u5b9a\u8f93\u5165\u5df2\u7ecf\u5230\u4e86\u4e00\u4e2a\u597d\u7684\u4f4d\u7f6e\uff0c\u90a3\u4e48JShell\u5c06\u6267\u884c\u8be5\u8868\u8fbe\u5f0f\u3002\u4f46\u662f\uff0c\u5982\u679c\u8f93\u5165\u5728\u4e2d\u9014\u6362\u884c\u6216\u8005\u62ec\u53f7\u4e0d\u5b8c\u6574\u7b49\u60c5\u51b5\u4e0b\u7ed3\u675f\u5f97\u4e0d\u5b8c\u6574\uff0cJShell\u5c06\u8981\u6c42\u7ee7\u7eed\u8f93\u5165\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; \"test\".repeat(\r\n   ...&gt;\r\n<\/code><\/pre>\n<p>\u5f53\u60a8\u8f93\u5165\u957f\u884c\u65f6\u81ea\u884c\u6362\u884c\u65f6\u5e76\u6ca1\u6709\u95ee\u9898\u3002\u4f46\u662f\uff0c\u5f53\u60a8\u8ba4\u4e3a\u5df2\u7ecf\u8f93\u5165\u4e86\u4e00\u884c\u4f46\u5b9e\u9645\u4e0a\u62ec\u53f7\u4e0d\u5339\u914d\u5bfc\u81f4\u884c\u672a\u7ed3\u675f\u65f6\uff0c\u8fd9\u6837\u7684\u60c5\u51b5\u4f1a\u5f88\u9ebb\u70e6\uff0c\u6709\u65f6\u91cd\u65b0\u8f93\u5165\u4f1a\u66f4\u5feb\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528[Ctrl]+[c]\u8fdb\u884c\u53d6\u6d88\u64cd\u4f5c\u3002<\/p>\n<h3>\u53d8\u91cf<br \/>\n\u987a\u4fbf\u8bf4\u4e00\u4e0b\uff0c\u5982\u679c\u8fd9\u4e2a\u503c\u63a5\u8fd1\u4e8e\u5706\u5468\u7387\uff0c\u6211\u4eec\u53ef\u4ee5\u7528\u5b83\u6765\u4ee3\u66ff\u5706\u5468\u7387\u8fdb\u884c\u5404\u79cd\u8fd0\u7b97\u3002\u636e\u8bf4\u53e4\u5df4\u6bd4\u4f26\u65f6\u671f\u5c31\u4f7f\u7528\u5b83\u4f5c\u4e3a\u5706\u5468\u7387\u3002\u4f46\u662f\u6bcf\u6b21\u8f9322.0\/7\u592a\u9ebb\u70e6\u4e86\u3002<\/p>\n<p>\u5f53\u6211\u91cd\u65b0\u5ba1\u89c6\u5e76\u8ba1\u7b9722.0 \/ 7\u65f6\uff0c\u7ed3\u679c\u663e\u793a\u5982\u4e0b\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; 22.0 \/ 7\r\n$9 ==&gt; 3.142857142857143\r\n<\/code><\/pre>\n<p>\u8fd9\u8868\u660e\u53ef\u4ee5\u4f7f\u7528\u503c\u4e3a9\u7684\u540d\u79f0\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; $9\r\n$9 ==&gt; 3.142857142857143\r\n<\/code><\/pre>\n<p>\u7136\u800c\uff0c\u8bb0\u4f4f\u8fd9\u4e2a\u6570\u5b57\u5f88\u9ebb\u70e6\u3002\u5982\u679c\u53ea\u6709\u4e00\u4e2a\u503c\u90a3\u5c31\u597d\u4e86\uff0c\u4f46\u662f\u5e0c\u671b\u8bb0\u4f4f\u7684\u503c\u4f1a\u4e0d\u65ad\u589e\u52a0\u3002\u7ed9\u503c\u53d6\u4e2a\u66f4\u5bb9\u6613\u8bb0\u5fc6\u548c\u7406\u89e3\u542b\u4e49\u7684\u540d\u5b57\u5c31\u5f88\u65b9\u4fbf\u4e86\u3002\u8fd9\u5c31\u662f\u53d8\u91cf\u7684\u4f5c\u7528\u3002\u53d8\u91cf\u53ef\u4ee5\u901a\u8fc7var \u53d8\u91cf\u540d=\u503c\u6765\u5b9a\u4e49\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; var pi = 22.0 \/ 7\r\npi ==&gt; 3.142857142857143\r\n<\/code><\/pre>\n<p>\u901a\u8fc7\u8fd9\u6bb5\u4ee3\u7801\uff0c\u53d8\u91cfpi\u88ab\u5b9a\u4e49\u4e14\u88ab\u8d4b\u503c\u4e3a3.142857142857143\u3002\u5f53\u8f93\u5165pi\u65f6\uff0c\u4f1a\u663e\u793a\u88ab\u8d4b\u503c\u7684\u503c\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; pi\r\npi ==&gt; 3.142857142857143\r\n<\/code><\/pre>\n<p>\u6211\u5011\u5c07\u4f7f\u7528\u9019\u500b\u516c\u5f0f\u4f86\u8a08\u7b97\u534a\u5f91\u70ba5\u7684\u5713\u7684\u5468\u9577\u3002\u5713\u7684\u5468\u9577\u7b49\u65bc\u76f4\u5f91\u4e58\u4ee5\u5713\u5468\u7387\u3002\u6211\u5011\u53ef\u4ee5\u5c07\u8b8a\u6578\u4f5c\u70ba\u8a08\u7b97\u7684\u503c\u4f86\u4f7f\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; 5*2*pi\r\n$16 ==&gt; 31.428571428571427\r\n<\/code><\/pre>\n<p>\u9762\u79ef\u662f\u534a\u5f84\u4e58\u4ee5\u534a\u5f84\u518d\u4e58\u4ee5\u5706\u5468\u7387\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; 5*5*pi\r\n$17 ==&gt; 78.57142857142857\r\n<\/code><\/pre>\n<p>\u4ee5\u8fd9\u79cd\u65b9\u5f0f\uff0c\u53ef\u4ee5\u4f7f\u7528\u53d8\u91cf\u6765\u91cd\u590d\u4f7f\u7528\u503c\u3002<br \/>\n\u987a\u4fbf\u8bf4\u4e00\u4e0b\uff0c\u5f53\u5728\u4f4d\u7f6e$17\u5b9a\u4e49\u53d8\u91cfpi\u65f6\uff0c\u663e\u793a\u4e3api\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u8fd9\u8868\u793a\u5c0678.57142857142857\u5206\u914d\u7ed9\u53d8\u91cf$17\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; $17\r\n$17 ==&gt; 78.57142857142857\r\n<\/code><\/pre>\n<p>\u987a\u4fbf\u8bf4\u4e00\u53e5\uff0c\u5728Java\u4e2d\uff0c\u5b9e\u9645\u4e0a\u4f7f\u7528Math.PI\u53ef\u4ee5\u4fdd\u6301\u8f83\u9ad8\u7cbe\u5ea6\u7684\u5706\u5468\u7387\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; Math.PI\r\n$82 ==&gt; 3.141592653589793\r\n<\/code><\/pre>\n<p>Math\u7c7b\u7684PI\u5b57\u6bb5\uff0c\u6211\u4eec\u5c06\u5728\u53e6\u5916\u5b66\u4e60\u65f6\u8be6\u7ec6\u8ba8\u8bba\u3002<\/p>\n<p>\u5982\u679c\u6211\u4eec\u5c06\u8fd9\u4e2a\u503c\u4f5c\u4e3a\u5706\u5468\u7387\u6765\u4f7f\u7528\uff0c\u90a3\u4e48\u534a\u5f84\u4e3a5\u7684\u5706\u7684\u9762\u79ef\u5c06\u4f1a\u662f\u5982\u4e0b\u7684\u6570\u503c\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; 5*5*Math.PI\r\n$81 ==&gt; 78.53981633974483\r\n<\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u5c06Math.PI\u5206\u914d\u7ed9\u53d8\u91cfpi\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; pi=Math.PI\r\npi ==&gt; 3.141592653589793\r\n<\/code><\/pre>\n<p>\u5982\u4e0b\u6240\u793a\uff0c\u53ef\u4ee5\u91cd\u65b0\u4e3a\u53d8\u91cf\u5206\u914d\u503c\u3002<br \/>\n\u91cd\u65b0\u8ba1\u7b975*5*pi\uff0c\u7ed3\u679c\u4e0e\u4f7f\u7528Math.PI\u5f97\u5230\u7684\u7ed3\u679c\u76f8\u540c\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; 5*5*pi\r\n$84 ==&gt; 78.53981633974483\r\n<\/code><\/pre>\n<h3>\u53d8\u91cf\u7684\u7c7b\u578b\u8ba9\u6211\u4eec\u628a\u4e00\u4e2a\u5b57\u7b26\u4e32\u8d4b\u7ed9\u5148\u524d\u63d0\u5230\u7684\u53d8\u91cfpi\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; pi=\"circle ratio\"\r\n|  \u30a8\u30e9\u30fc:\r\n|  \u4e0d\u9069\u5408\u306a\u578b: java.lang.String\u3092double\u306b\u5909\u63db\u3067\u304d\u307e\u305b\u3093:\r\n|  pi=\"circle ratio\"\r\n|     ^------------^\r\n<\/code><\/pre>\n<p>\u51fa\u9519\u4e86\u3002\u63d0\u793a\u65e0\u6cd5\u5c06String\u8f6c\u6362\u4e3adouble\u3002<br \/>\n\u5728Java\u4e2d\uff0c\u53d8\u91cf\u88ab\u5206\u914d\u7684\u503c\u7684\u7c7b\u578b\u662f\u786e\u5b9a\u7684\u3002\u8fd9\u79cd\u7c7b\u578b\u7684\u6982\u5ff5\u88ab\u79f0\u4e3a\u201c\u7c7b\u578b\u201d\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u53d8\u91cf\u7684\u7c7b\u578b\u662f\u786e\u5b9a\u7684\u3002<br \/>\n\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u6574\u6570\u662fint\uff0c\u5c0f\u6570\u662fdouble\uff0c\u5b57\u7b26\u4e32\u662fString\u3002<br \/>\n\u90a3\u4e48\uff0c\u8ba9\u6211\u4eec\u6765\u786e\u8ba4\u53d8\u91cf\u7684\u7c7b\u578b\u3002\u5728JShell\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\/var\u547d\u4ee4\u6765\u786e\u8ba4\u53d8\u91cf\u7684\u7c7b\u578b\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; \/var pi\r\n|    double pi = 3.141592653589793\r\n<\/code><\/pre>\n<p>\u8fd9\u8868\u793a\u53d8\u91cfpi\u7684\u7c7b\u578b\u662fdouble\uff0c\u5e76\u4e14\u88ab\u8d4b\u4e88\u4e86\u503c3.141592653589793\u3002double\u662f\u5904\u7406\u5b9e\u6570\u7684\u7c7b\u578b\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u770b\u5b57\u7b26\u4e32\u7684\u60c5\u51b5\u3002\u9996\u5148\uff0c\u51c6\u5907\u4e00\u4e2a\u53d8\u91cfstr\uff0c\u5e76\u4e3a\u5176\u5206\u914d\u5b57\u7b26\u4e32&#8221;circle&#8221;\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; var str=\"circle\"\r\nstr ==&gt; \"circle\"\r\n<\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u4f7f\u7528\/var\u547d\u4ee4\u6765\u786e\u8ba4\u7c7b\u578b\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; \/var str\r\n|    String str = \"circle\"\r\n<\/code><\/pre>\n<p>\u5b57\u7b26\u4e32\u88ab\u8868\u793a\u4e3aString\u7c7b\u578b\u3002\u8fd9\u610f\u5473\u7740\u5b57\u7b26\u4e32\u4ee5String\u7c7b\u578b\u8868\u793a\u3002<br \/>\n\u5982\u679c\u5c1d\u8bd5\u5206\u914d\u5b9e\u6570\uff0c\u5c31\u4f1a\u51fa\u73b0\u9519\u8bef\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; str=3.14\r\n|  \u30a8\u30e9\u30fc:\r\n|  \u4e0d\u9069\u5408\u306a\u578b: double\u3092java.lang.String\u306b\u5909\u63db\u3067\u304d\u307e\u305b\u3093:\r\n|  str=3.14\r\n|      ^--\r\n<\/code><\/pre>\n<p>\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u6211\u4eec\u4e00\u76f4\u4f7f\u7528var\u6765\u58f0\u660e\u53d8\u91cf\u3002\u4f7f\u7528var\u53ef\u4ee5\u81ea\u52a8\u786e\u5b9a\u53d8\u91cf\u7684\u7c7b\u578b\u3002\u5728\u8fd9\u91cc\uff0c\u4e5f\u53ef\u4ee5\u6307\u5b9a\u7c7b\u578b\u6765\u58f0\u660e\u53d8\u91cf\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; String message=\"hello\"\r\nmessage ==&gt; \"hello\"\r\n<\/code><\/pre>\n<p>\u800c\u4e14\uff0c\u4e5f\u53ef\u4ee5\u5bf9\u8fd9\u79cd\u53d8\u91cf\u8c03\u7528\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; message.length()\r\n$325 ==&gt; 5\r\n<\/code><\/pre>\n<p>\u5728\u4e2d\u56fd\uff0c\u65b9\u6cd5\u53ef\u4ee5\u6839\u636e\u7c7b\u578b\u8fdb\u884c\u8c03\u7528\u3002length\u65b9\u6cd5\u548crepeat\u65b9\u6cd5\u662f\u4e3aString\u7c7b\u578b\u51c6\u5907\u7684\u65b9\u6cd5\u3002\u800cdouble\u7c7b\u578b\u6ca1\u6709\u53ef\u8c03\u7528\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u4e5f\u53ef\u4ee5\u5c06\u65b9\u6cd5\u8fd4\u56de\u7684\u503c\u8d4b\u7ed9\u53d8\u91cf\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; var count=message.length()\r\ncount ==&gt; 5\r\n<\/code><\/pre>\n<p>\u5728\u8fd9\u91cc\uff0c\u53d8\u91cfcount\u662fint\u7c7b\u578b\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; \/var count\r\n|    int count = 5\r\n<\/code><\/pre>\n<p>int\u7c7b\u578b\u662f\u5904\u7406\u6574\u6570\u7684\u6570\u636e\u7c7b\u578b\u3002<\/p>\n<p>\u7ec3\u4e60\uff1a\u4f7f\u7528var\uff0c\u5c06\u5b9e\u65701.414\u8d4b\u7ed9\u53d8\u91cfroot2\u3002<br \/>\n\u7ec3\u4e60\uff1a\u4e0d\u4f7f\u7528var\uff0c\u5c06\u5b57\u7b26\u4e32&#8221;apple&#8221;\u8d4b\u7ed9\u53d8\u91cfword\u3002<br \/>\n\u7ec3\u4e60\uff1a\u5bf9\u4e0a\u8ff0\u51c6\u5907\u597d\u7684word\u8c03\u7528toUpperCase\u65b9\u6cd5\u3002<\/p>\n<h3>\u65b9\u6cd5\u7684\u5b9a\u4e49\u5728Java\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u5b9a\u4e49\u65b9\u6cd5\u6765\u91cd\u590d\u4f7f\u7528\u8868\u8fbe\u5f0f\uff0c\u8fd9\u5bf9\u4e8e\u7c7b\u4f3c\u534a\u5f84\u4e58\u4ee5\u534a\u5f84\u4e58\u4ee5\u5706\u5468\u7387\u7684\u8868\u8fbe\u5f0f\u975e\u5e38\u65b9\u4fbf\u3002<\/p>\n<p>\u8bf7\u5c1d\u8bd5\u8fd0\u884c\u4e00\u4e0b\u7a0d\u957f\u7684\u4ee3\u7801\uff1adouble menseki(double r){return r*r*pi;}<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; double menseki(double r){return r*r*pi;}\r\n|  \u6b21\u3092\u4f5c\u6210\u3057\u307e\u3057\u305f: \u30e1\u30bd\u30c3\u30c9 menseki(double)\r\n<\/code><\/pre>\n<p>\u8fd9\u6837\uff0c\u9762\u79ef\u65b9\u6cd5\u5df2\u7ecf\u88ab\u5b9a\u4e49\u4e86\u3002\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u4f7f\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; menseki(5)\r\n$34 ==&gt; 78.53981633974483\r\n\r\njshell&gt; menseki(3)\r\n$33 ==&gt; 28.274333882308138\r\n<\/code><\/pre>\n<p>\u4f60\u53ef\u4ee5\u91cd\u590d\u4f7f\u7528\u8fd9\u4e2a\u8868\u8fbe\u5f0f\u3002<\/p>\n<p>\u90a3\u4e48\u8ba9\u6211\u4eec\u7a0d\u5fae\u8be6\u7ec6\u5730\u770b\u4e00\u4e0b\u65b9\u6cd5\u7684\u5b9a\u4e49\u3002\u5982\u679c\u6211\u4eec\u968f\u610f\u6362\u884c\u65b9\u6cd5\u7684\u5b9a\u4e49\uff0c\u5c31\u4f1a\u53d8\u6210\u4ee5\u4e0b\u8fd9\u6837\u3002<\/p>\n<pre class=\"post-pre\"><code>double menseki(double r) {\r\n  return r*r*pi;\r\n}\r\n<\/code><\/pre>\n<p>\u8fd9\u4e2a\u5b9a\u4e49\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<pre class=\"post-pre\"><code>\u7d50\u679c\u306e\u578b \u30e1\u30bd\u30c3\u30c9\u540d(\u5f15\u6570\u306e\u578b \u5f15\u6570\u3092\u6271\u3046\u5909\u6570) {\r\n  return \u5f0f;\r\n}\r\n<\/code><\/pre>\n<p>\u8fd9\u6b21\u5b9a\u4e49\u4e86\u4e00\u4e2a\u540d\u4e3amenseki\u7684\u65b9\u6cd5\uff0c\u63a5\u6536\u5b9e\u6570\u5e76\u8fd4\u56de\u5b9e\u6570\u3002\u4f7f\u7528\u53d8\u91cfr\u6765\u63a5\u6536\u4f20\u5165\u7684\u53c2\u6570\uff0cr\u4ee3\u8868\u534a\u5f84\u3002\u5728\u8fd4\u56de\u503c\u65f6\u4f7f\u7528return\u8bed\u53e5\u3002\u5728\u8fd9\u91cc\uff0c\u8fd4\u56de\u503c\u662f\u63a5\u6536\u5230\u7684\u534a\u5f84\u4e58\u4ee52\u518d\u4e58\u4ee5\u5706\u5468\u7387\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u5728JShell\u4e2d\uff0c\u60a8\u4e5f\u53ef\u4ee5\u901a\u8fc7\u6362\u884c\u6765\u5b9a\u4e49\u53d8\u91cf\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; double menseki(double r) {\r\n   ...&gt;   return r*r*pi;\r\n   ...&gt; }\r\n|  \u6b21\u3092\u5909\u66f4\u3057\u307e\u3057\u305f: \u30e1\u30bd\u30c3\u30c9 menseki(double)\r\n<\/code><\/pre>\n<p>\u7ec3\u4e60\uff1a\u53c2\u6570\u7684\u540d\u79f0\u4e0d\u4e00\u5b9a\u8981\u4e3ar\u3002\u8bf7\u5c1d\u8bd5\u5b9a\u4e49\u4e00\u4e2a\u4e0e\u76f8\u540c\u529f\u80fd\u7684\u65b9\u6cd5menseki2\uff0c\u5c06\u53c2\u6570\u547d\u540d\u4e3aa\u3002<br \/>\n\u7ec3\u4e60\uff1a\u8bf7\u5b9a\u4e49\u4e00\u4e2a\u63a5\u53d7\u534a\u5f84\u5e76\u8fd4\u56de\u5706\u5468\u957f\u7684\u65b9\u6cd5\u3002<\/p>\n<h2>\u6447\u6446\u4f60\u6709\u6ca1\u6709\u89c9\u5f97\u5149\u770b\u6587\u5b57\u5f88\u65e0\u804a\u5462\uff1f\u4e3a\u4e86\u4e0d\u53ea\u662f\u770b\u6587\u5b57\uff0c\u6211\u4eec\u6765\u6267\u884c\u4e00\u4e9b\u5176\u4ed6\u7684\u4e1c\u897f\u5427\u3002<br \/>\n\u6211\u4eec\u5c06\u663e\u793a\u4e00\u4e2a\u7a97\u53e3\u3002\u5728Java\u4e2d\uff0c\u5df2\u7ecf\u51c6\u5907\u4e86\u4e00\u4e2a\u540d\u4e3aSwing\u7684GUI\u5de5\u5177\u5305\u3002GUI\u5de5\u5177\u5305\u662f\u7528\u4e8e\u663e\u793a\u7a97\u53e3\u548c\u5e03\u7f6e\u6309\u94ae\u7b49\u7ec4\u4ef6\u7684\u90e8\u5206\u3002<\/p>\n<h3>\u663e\u793a\u7a97\u53e3\u9996\u5148\u51c6\u5907\u4e00\u4e2a\u7a97\u53e3\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; var f = new javax.swing.JFrame(\"test\")\r\nf ==&gt; javax.swing.JFrame[fram ... bled=true]\r\n<\/code><\/pre>\n<p>\u6211\u6709\u70b9\u4e0d\u592a\u660e\u767d\uff0c\u4f46\u53d8\u91cff\u5df2\u7ecf\u88ab\u5206\u914d\u4e86\u67d0\u4e9b\u5185\u5bb9\u3002<br \/>\n\u63a5\u4e0b\u6765\uff0c\u6211\u5c06\u8c03\u7528show()\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; f.show()\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/140-0.png\" alt=\"image.png\" \/><\/p>\n<pre class=\"post-pre\"><code>jshell&gt; f.setSize(400,300)\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/142-0.png\" alt=\"image.png\" \/><\/p>\n<h4>\u7c7b\u548c\u5bf9\u8c61<br \/>\n\u5728\u521b\u5efa\u7a97\u53e3\u65f6\uff0c\u6211\u6267\u884c\u4e86\u4ee5\u4e0b\u4ee3\u7801\uff1a var f = new javax.swing.JFrame(&#8220;test&#8221;)\u3002<br \/>\n\u5728Java\u4e2d\uff0c\u6211\u4eec\u5c06\u7a0b\u5e8f\u5904\u7406\u7684\u7a97\u53e3\u3001\u6309\u94ae\u7b49\u5bf9\u8c61\u79f0\u4e3a\u201c\u5bf9\u8c61\u201d\u3002\u5728\u8fd9\u91cc\uff0c\u53d8\u91cff\u88ab\u5206\u914d\u4e86\u4e00\u4e2a\u7a97\u53e3\u5bf9\u8c61\u3002Swing\u4e2d\u4f7f\u7528javax.swing.JFrame\u7c7b\u578b\u6765\u8868\u793a\u7a97\u53e3\u3002\u5bf9\u8c61\u662f\u57fa\u4e8e\u67d0\u79cd\u7c7b\u578b\u751f\u6210\u7684\u3002\u7528\u4e8e\u751f\u6210\u5bf9\u8c61\u7684\u57fa\u672c\u7c7b\u578b\u88ab\u79f0\u4e3a\u201c\u7c7b\u201d\u3002javax.swing.JFrame\u5c31\u662f\u4e00\u4e2a\u7c7b\u3002<\/p>\n<p>\u5f53\u4ece\u7c7b\u4e2d\u751f\u6210\u5bf9\u8c61\u65f6\uff0c\u6211\u4eec\u4f7f\u7528new\u8fd0\u7b97\u7b26\uff0c\u5e76\u4ee5new \u7c7b\uff08\u53c2\u6570\uff09\u7684\u65b9\u5f0f\u751f\u6210\u3002\u53c2\u6570\u7531\u7c7b\u786e\u5b9a\u3002<\/p>\n<p>\u4ece\u67d0\u79cd\u89d2\u5ea6\u6765\u770b\uff0c\u751f\u6210\u5bf9\u8c61\u65f6\u4f3c\u4e4e\u8fd8\u5728\u8c03\u7528\u7279\u6b8a\u7684\u65b9\u6cd5\u3002\u6211\u4eec\u79f0\u4e4b\u4e3a\u201c\u6784\u9020\u51fd\u6570\u201d\u3002\u6784\u9020\u51fd\u6570\u662f\u4e0e\u7c7b\u540c\u540d\uff0c\u9700\u8981\u901a\u8fc7new\u8fd0\u7b97\u7b26\u8fdb\u884c\u8c03\u7528\u7684\u65b9\u6cd5\u3002<\/p>\n<h4>Java\u6587\u6863javax.swing.JFrame\u7684\u6587\u6863\u53ef\u4ee5\u5728\u6b64\u5904\u627e\u5230\uff1a<br \/>\nhttps:\/\/docs.oracle.com\/en\/java\/javase\/18\/docs\/api\/java.desktop\/javax\/swing\/JFrame.html<\/p>\n<p>\u5982\u679c\u4f60\u60f3\u4f7f\u7528\u65e5\u8bed\u7684\u8bdd\uff0c\u8fd9\u662f\u94fe\u63a5\u7ed9\u4f60\uff1a<br \/>\nhttps:\/\/docs.oracle.com\/javase\/jp\/17\/docs\/api\/java.desktop\/javax\/swing\/JFrame.html<\/p>\n<p>\u8fd9\u4e2a\u6587\u6863\u7684\u683c\u5f0f\u88ab\u79f0\u4e3a\u300cJavaDoc\u300d\u3002Java\u7684API\u6587\u6863\u5927\u591a\u91c7\u7528\u8fd9\u4e2a\u683c\u5f0f\u3002<\/p>\n<p>\u641c\u7d22\u300cjavadoc JFrame\u300d\u7b49\u7b49\uff0c\u7528javadoc + \u7c7b\u540d\u5373\u53ef\u627e\u5230\u5927\u90e8\u5206\u7684JavaDoc\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/150-0.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2018-06-11 19.54.59.png\" \/>\u901a\u8fc7\u89c2\u5bdf\u8fd9\u6bb5\u4ee3\u7801\uff0c\u6211\u4eec\u53ef\u4ee5\u77e5\u9053\u5728\u8fd9\u91cc\u4f7f\u7528\u7684\u662fJFrame\u7684\u6784\u9020\u51fd\u6570\uff08String title\uff09\u3002\u8fd8\u63d0\u4f9b\u4e86\u65e0\u53c2\u6570\u7684\u6784\u9020\u51fd\u6570\uff0c\u56e0\u6b64\u53ef\u4ee5\u751f\u6210\u6ca1\u6709\u6307\u5b9a\u6807\u9898\u7684\u7a97\u53e3\u3002<\/p>\n<p>\u53ef\u80fd\u9700\u8981\u66f4\u591a\u7684\u5b66\u4e60Java\u8bed\u8a00\u624d\u80fd\u7406\u89e3\u8fd9\u4e9b\u5185\u5bb9\uff0c\u4f46\u901a\u8fc7\u67e5\u9605JavaDoc\u53ef\u4ee5\u4e86\u89e3\u5230\u6211\u4eec\u6240\u5199\u7684\u4ee3\u7801\u7684\u610f\u4e49\uff0c\u5e76\u5bf9Java\u8bed\u8a00\u6709\u66f4\u597d\u7684\u7406\u89e3\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u4e00\u822c\u6765\u8bf4\uff0c\u89e3\u91ca\u4e66\u7c4d\u5e76\u4e0d\u80fd\u89e3\u91ca\u6240\u6709\u5185\u5bb9\uff0c\u6240\u4ee5\u53c2\u8003\u8fd9\u79cd\u4e00\u624b\u8d44\u6599\u6765\u51c6\u786e\u5730\u7406\u89e3\u4e5f\u975e\u5e38\u91cd\u8981\u3002<\/p>\n<p>\u7ec3\u4e60\uff1a\u8bf7\u5728JavaDoc\u4e2d\u67e5\u627e\u4e4b\u524d\u4f7f\u7528\u8fc7\u7684String\u7684replace\u65b9\u6cd5\u3002<br \/>\n\u63d0\u793a\uff1a\u5728\u53f3\u4e0a\u89d2\u7684\u641c\u7d22\u6846\u4e2d\u8fdb\u884c\u641c\u7d22\u4f1a\u5f88\u65b9\u4fbf\u3002<\/p>\n<h3>\u5305\u548c\u5bfc\u5165\u65e2\u7136\u7a97\u53e3\u5df2\u7ecf\u80fd\u591f\u663e\u793a\u51fa\u6765\u4e86\uff0c\u90a3\u4e48\u6211\u4eec\u5c31\u5f00\u59cb\u5e03\u7f6e\u6587\u672c\u533a\u57df\u5427\u3002\u6587\u672c\u533a\u57df\u662f\u4e00\u4e2a\u53ef\u4ee5\u8f93\u5165\u591a\u884c\u5b57\u7b26\u7684\u7ec4\u4ef6\u3002\u5728Swing\u4e2d\uff0c\u6587\u672c\u533a\u57df\u4f7f\u7528javax.swing.JTextArea\u7c7b\u6765\u5904\u7406\u3002\u800c\u5c06\u8fd9\u6837\u7684\u7ec4\u4ef6\u653e\u5728\u7a97\u53e3\u4e0a\uff0c\u6211\u4eec\u79f0\u4e4b\u4e3a&#8221;\u7ec4\u4ef6&#8221;\u3002<br \/>\n\u4e3a\u4e86\u5e03\u7f6e\u6587\u672c\u533a\u57df\uff0c\u9996\u5148\u9700\u8981\u751f\u6210\u4e00\u4e2a\u6587\u672c\u533a\u57df\u7684\u5bf9\u8c61\u3002\u8981\u751f\u6210\u5bf9\u8c61\uff0c\u5c31\u8981\u8c03\u7528\u4e0e\u7c7b\u540d\u76f8\u540c\u7684\u65b9\u6cd5\uff0c\u4e5f\u5c31\u662f\u6784\u9020\u51fd\u6570\uff0c\u5728\u5176\u524d\u9762\u52a0\u4e0anew\u8fd0\u7b97\u7b26\u3002\u4f46\u662fjavax.swing.JTextArea\u8fd9\u4e2a\u540d\u5b57\u592a\u957f\uff0c\u6bcf\u6b21\u8f93\u5165\u90fd\u5f88\u9ebb\u70e6\u3002<br \/>\n\u5b9e\u9645\u4e0a\uff0cjavax.swing.JTextArea\u88ab\u5206\u4e3a\u4e24\u90e8\u5206\uff0c\u6700\u540e\u4e00\u4e2a\u5206\u9694\u7b26\u662f\u7c7b\u540d\uff0c\u524d\u9762\u7684\u90e8\u5206\u662f\u5305\u540d\u3002\u4e5f\u5c31\u662f\u8bf4javax.swing\u6307\u7684\u662fjavax.swing\u4e0b\u7684JTextArea\u7c7b\u3002&#8221;\u5305&#8221;\u662fJava\u4e2d\u7528\u6765\u5206\u7c7b\u7c7b\u7684\u673a\u5236\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u4f7f\u7528import\u8bed\u53e5\u53ef\u4ee5\u7701\u7565\u5305\u540d\u3002\u4f8b\u5982\uff0c\u4f7f\u7528import javax.swing.*\u53ef\u4ee5\u7701\u7565javax.swing\u5305\u7684\u5305\u540d\uff0c\u5e76\u53ea\u7528\u7c7b\u540d\u8868\u793a\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; import javax.swing.*\r\n<\/code><\/pre>\n<p>\u867d\u7136\u6211\u4e4b\u524d\u4e00\u76f4\u5ffd\u7565\u4e86\uff0c\u4f46\u662f\u6211\u6ce8\u610f\u5230\u4e86String\u7c7b\u578b\u4f1a\u4ee5java.lang.String\u7684\u5f62\u5f0f\u663e\u793a\u51fa\u6765\u3002String\u7c7b\u578b\u88ab\u5305\u542b\u5728java.lang\u5305\u4e2d\uff0c\u7531\u4e8e\u9884\u5148\u8fdb\u884c\u4e86\u5bfc\u5165(import)\u64cd\u4f5c\uff0c\u56e0\u6b64\u53ef\u4ee5\u7701\u7565\u5305\u540d\u3002<\/p>\n<p>\u90a3\u4e48\uff0c\u8ba9\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u8868\u793a\u6587\u672c\u533a\u57df\u7684JTextArea\u7c7b\u7684\u5bf9\u8c61\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; var textarea = new JTextArea()\r\ntextarea ==&gt; javax.swing.JTextArea[,0,0,0x0,i ... rap=false]\r\n<\/code><\/pre>\n<p>\u9700\u8981\u5c06\u8fd9\u4e2a\u653e\u7f6e\u5728\u7a97\u53e3\u4e2d\u3002\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528add\u65b9\u6cd5\u5c06\u5176\u6dfb\u52a0\u5230\u8868\u793a\u7a97\u53e3\u7684JFrame\u5bf9\u8c61\u4e2d\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; f.add(textarea)\r\n$14 ==&gt; javax.swing.JTextArea[,0,0,0x0,inval ... se,wrap=false]\r\n<\/code><\/pre>\n<p>\u7136\u800c\uff0c\u5982\u679c\u4e0d\u8fdb\u884c\u91cd\u65b0\u7ec4\u7ec7\uff0c\u5b83\u5c06\u4e0d\u4f1a\u663e\u793a\u5728\u7a97\u53e3\u4e0a\uff0c\u56e0\u6b64\u9700\u8981\u91cd\u65b0\u7ec4\u7ec7\u7a97\u53e3\u3002\u901a\u8fc7\u8c03\u6574\u7a97\u53e3\u7684\u5927\u5c0f\uff0c\u53ef\u4ee5\u8fdb\u884c\u91cd\u65b0\u7ec4\u7ec7\uff0c\u53ef\u4ee5\u5c1d\u8bd5\u62d6\u52a8\u7a97\u53e3\u7684\u8fb9\u7f18\u6765\u6539\u53d8\u5927\u5c0f\uff0c\u6216\u8005\u8c03\u7528setSize\u65b9\u6cd5\u3002\u5f53\u4f7f\u7528setSize\u65b9\u6cd5\u6307\u5b9a\u5927\u5c0f\u65f6\uff0c\u5982\u679c\u7a97\u53e3\u5927\u5c0f\u6ca1\u6709\u6539\u53d8\uff0c\u5c06\u4e0d\u4f1a\u6267\u884c\u4efb\u4f55\u64cd\u4f5c\uff0c\u56e0\u6b64\u9700\u8981\u7a0d\u5fae\u8c03\u6574\u5927\u5c0f\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; f.setSize(400,301)\r\n<\/code><\/pre>\n<p>\u73b0\u5728\u663e\u793a\u4e86\u6587\u672c\u533a\u57df\uff0c\u60a8\u53ef\u4ee5\u8f93\u5165\u6587\u5b57\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/165-0.png\" alt=\"image.png\" \/>\u5bf9\u4e8e\u6587\u672c\u8f93\u5165\u6846\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528append\u65b9\u6cd5\u6765\u6dfb\u52a0\u5b57\u7b26\u4e32\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; textarea.append(\"te\")\r\n\r\njshell&gt; textarea.append(\"st\")\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/168-0.png\" alt=\"image.png\" \/>\u6362\u884c\u7528&#8221;\\n&#8221;\u8868\u793a\u3002\uff08\u5728Windows\u4e2d\u7528&#8221;\uffe5n&#8221;\u8868\u793a\uff09<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; textarea.append(\"\\ntester\\n\")\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/171-0.png\" alt=\"image.png\" \/><\/p>\n<h3>\u6dfb\u52a0\u6309\u94ae\u597d\u7684\uff0c\u73b0\u5728\u8ba9\u6211\u4eec\u6765\u6dfb\u52a0\u4e00\u4e2a\u6309\u94ae\u3002\u5728 Swing \u4e2d\uff0c\u6309\u94ae\u662f\u901a\u8fc7 JButton \u7c7b\u6765\u5904\u7406\u7684\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7\u6784\u9020\u51fd\u6570\u7684\u53c2\u6570\u6765\u6307\u5b9a\u6309\u94ae\u7684\u6807\u7b7e\u5b57\u7b26\u4e32\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; var button = new JButton(\"Hello\")\r\nbutton ==&gt; javax.swing.JButton[,0,0,0x0,inval...pable=true]\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/175-0.png\" alt=\"image.png\" \/>\u5c06\u7b2c\u4e00\u4e2a\u53c2\u6570\u6307\u5b9a\u4e3a\u6dfb\u52a0\u4f4d\u7f6e\uff0c\u5e76\u5c06\u7b2c\u4e8c\u4e2a\u53c2\u6570\u6307\u5b9a\u4e3a\u8981\u6dfb\u52a0\u7684\u7ec4\u4ef6\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; f.add(\"North\", button)\r\n$27 ==&gt; javax.swing.JButton[,0,0,0x0,inval...ltCapable=true]\r\n<\/code><\/pre>\n<p>\u5982\u679c\u62fc\u5199\u9519\u8bef\u4e86&#8221;North&#8221;\u8fd9\u4e2a\u8bcd\uff0c\u5c31\u4f1a\u51fa\u73b0\u8fd9\u6837\u7684\u9519\u8bef\u3002\u8bf7\u6ce8\u610f\u5927\u5c0f\u5199\u7684\u533a\u522b\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; f.add(\"Nort\", button)\r\n|  Exception java.lang.IllegalArgumentException: cannot add to layout: unknown constraint: Nort\r\n|        at BorderLayout.addLayoutComponent (BorderLayout.java:468)\r\n|        at BorderLayout.addLayoutComponent (BorderLayout.java:429)\r\n|        at JRootPane$1.addLayoutComponent (JRootPane.java:507)\r\n|        at Container.addImpl (Container.java:1151)\r\n|        at Container.add (Container.java:1028)\r\n|        at JFrame.addImpl (JFrame.java:553)\r\n|        at Container.add (Container.java:459)\r\n|        at (#31:1)\r\n<\/code><\/pre>\n<p>\u987a\u4fbf\u8bf4\u4e00\u4e0b\uff0c\u8fd9\u4e2a\u9519\u8bef\u4e0e\u4ee5\u524d\u8bd5\u56fe\u5c06\u5b57\u7b26\u4e32\u8d4b\u7ed9\u53d8\u91cfpi\u65f6\u53d1\u751f\u7684\u9519\u8bef\u5b8c\u5168\u4e0d\u540c\u3002\u5b83\u4e5f\u4e0d\u540c\u4e8e\u62fc\u5199\u9519\u8bef\u6dfb\u52a0add\u7684\u60c5\u51b5\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; f.ad(\"North\", b)\r\n|  \u30a8\u30e9\u30fc:\r\n|  \u30b7\u30f3\u30dc\u30eb\u3092\u898b\u3064\u3051\u3089\u308c\u307e\u305b\u3093\r\n|    \u30b7\u30f3\u30dc\u30eb:   \u30e1\u30bd\u30c3\u30c9 ad(java.lang.String,javax.swing.JButton)\r\n|    \u5834\u6240: \u30bf\u30a4\u30d7javax.swing.JFrame\u306e\u5909\u6570 f\r\n|  f.ad(\"North\", b)\r\n|  ^--^\r\n<\/code><\/pre>\n<p>\u8fd9\u4e9b\u9519\u8bef\u53d1\u751f\u7684\u65f6\u95f4\u4e0d\u540c\uff0c\u5c1d\u8bd5\u4e3aadd\u6216\u53d8\u91cfpi\u5206\u914d\u5b57\u7b26\u4e32\u65f6\u7684\u9519\u8bef\u662f\u5728\u89e3\u91ca\u7a0b\u5e8f\u65f6\u53d1\u751f\u7684\u9519\u8bef\uff0c\u5f53\u9519\u8bef\u5730\u8f93\u5165&#8221;North&#8221;\u65f6\u662f\u5728\u6267\u884c\u89e3\u91ca\u8fc7\u7684\u5904\u7406\u65f6\u53d1\u751f\u7684\u9519\u8bef\u3002<br \/>\n\u5c06\u89e3\u91ca\u7a0b\u5e8f\u65f6\u53d1\u751f\u7684\u9519\u8bef\u79f0\u4e3a\u7f16\u8bd1\u9519\u8bef\uff0c\u5c06\u8fd0\u884c\u65f6\u9519\u8bef\u79f0\u4e3a\u5f02\u5e38\u3002<br \/>\n\u73b0\u5728\u4e24\u79cd\u9519\u8bef\u90fd\u5728\u8f93\u5165\u6307\u4ee4\u5e76\u6309\u4e0b\u56de\u8f66\u952e\u65f6\u53d1\u751f\uff0c\u6240\u4ee5\u5f88\u96be\u533a\u5206\uff0c\u4f46\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u5e94\u8be5\u53ef\u4ee5\u660e\u786e\u533a\u5206\u3002\u73b0\u5728\uff0c\u53ea\u8981\u60a8\u80fd\u611f\u53d7\u5230\u9519\u8bef\u6709\u4e24\u79cd\u7c7b\u578b\uff0c\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n<p>\u8bdd\u867d\u8fd9\u6837\u8bf4\uff0c\u5373\u4f7fadd\u64cd\u4f5c\u6210\u529f\u6267\u884c\uff0c\u6309\u94ae\u4ecd\u7136\u4e0d\u4f1a\u663e\u793a\u51fa\u6765\u3002<br \/>\n\u4f46\u662f\u5982\u679c\u4f7f\u7528setSize\u65b9\u6cd5\u91cd\u65b0\u6784\u5efa\u7a97\u53e3\uff0c\u6309\u94ae\u5c31\u4f1a\u663e\u793a\u51fa\u6765\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; f.setSize(400,300)\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/185-0.png\" alt=\"image.png\" \/><br \/>\n\u4f46\u662f\uff0c\u5373\u4f7f\u6309\u4e0b\u8fd9\u4e2a\u6309\u94ae\u4e5f\u4ec0\u4e48\u90fd\u4e0d\u4f1a\u53d1\u751f\u3002\u9700\u8981\u7f16\u5199\u4e00\u4e9b\u5904\u7406\u3002\u8bf7\u5c1d\u8bd5\u4ee5\u4e0b\u8f93\u5165\u65b9\u5f0f\u3002addActionListener\u6709\u70b9\u957f\uff0c\u4f46\u662f\u8f93\u5165addAc\u7136\u540e\u6309\u4e0b[tab]\u952e\uff0c\u5e94\u8be5\u4f1a\u81ea\u52a8\u8865\u5145\u5269\u4e0b\u7684\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; button.addActionListener(ae -&gt; textarea.append(\"Hello!\\n\"))\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/188-0.png\" alt=\"image.png\" \/>\u8981\u6dfb\u52a0\u6309\u94ae\u70b9\u51fb\u65f6\u7684\u5904\u7406\uff0c\u9700\u8981\u4f7f\u7528addActionListener\u65b9\u6cd5\u3002<br \/>\n\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5c06\u53c2\u6570ae-&gt;textarea.append(&#8220;Hello!\\n&#8221;)\u6307\u5b9a\u4e3aaddActionListener\u65b9\u6cd5\u3002addActionListener\u65b9\u6cd5\u9700\u8981\u4f20\u9012\u4e00\u4e9b\u5904\u7406\uff0c\u76f8\u5f53\u4e8e\u201c\u5f53\u6309\u94ae\u88ab\u70b9\u51fb\u65f6\uff0c\u8bf7\u8c03\u7528\u6b64\u5904\u7406\u201d\u3002\u8fd9\u91cc\u7684\u5904\u7406\u662ftextarea.append(&#8220;Hello!\\n&#8221;)\uff0c\u4f46\u5982\u679c\u8981\u5c06\u5904\u7406\u4f5c\u4e3a\u503c\u4f20\u9012\uff0c\u9700\u8981\u4f7f\u7528\u7c7b\u4f3c\u201cLambda\u8868\u8fbe\u5f0f\u201d\u7684\u65b9\u5f0f\u3002<br \/>\nLambda\u8868\u8fbe\u5f0f\u7684\u5199\u6cd5\u5982\u4e0b\u3002<\/p>\n<pre class=\"post-pre\"><code>\u5f15\u6570 -&gt; \u51e6\u7406\r\n<\/code><\/pre>\n<p>\u5f53\u6309\u4e0b\u6309\u94ae\u65f6\uff0c\u9700\u8981\u5904\u7406\u7684\u60c5\u51b5\u4e0b\uff0c\u5c06ActionEvent\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570\u8fdb\u884c\u63a5\u6536\uff0c\u5728\u6b64\u5904\u6211\u4eec\u5c06\u5176\u547d\u540d\u4e3aae\uff0c\u4f46\u5982\u679c\u53ef\u4ee5\u7406\u89e3\uff0c\u53ef\u4ee5\u4f7f\u7528\u4efb\u4f55\u540d\u79f0\u3002\u6211\u4eec\u76ee\u524d\u6ca1\u6709\u4f7f\u7528\u63a5\u6536\u5230\u7684\u53c2\u6570\u3002<\/p>\n<h3>\u4ece\u6587\u672c\u6846\u63a5\u6536\u8f93\u5165\u6211\u4eec\u518d\u591a\u52aa\u529b\u4e00\u70b9\u5427\u3002<br \/>\n\u6211\u4f1a\u5c1d\u8bd5\u505a\u4e00\u4e2a\u5f53\u6309\u4e0b\u6309\u94ae\u65f6\uff0c\u5728\u6587\u672c\u6846\u4e2d\u663e\u793a\u8f93\u5165\u7684\u6587\u672c\u5b57\u7b26\u4e32\u7684\u529f\u80fd\u3002<br \/>\n\u6211\u60f3\u6dfb\u52a0\u6587\u672c\u6846\u548c\u6309\u94ae\uff0c\u4f46\u5728JFrame\u7684\u5e03\u5c40\u65b9\u5f0f\u4e0b\u65e0\u6cd5\u76f4\u63a5\u6dfb\u52a0\u3002\u56e0\u6b64\uff0c\u6211\u5c06\u4f7f\u7528JPanel\u7ec4\u4ef6\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; var panel = new JPanel()\r\n\r\njshell&gt; f.add(\"South\", panel)\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/195-0.png\" alt=\"image.png\" \/>\u6dfb\u52a0\u6587\u672c\u5b57\u6bb5\u3002\u6587\u672c\u5b57\u6bb5\u662f\u4e00\u79cd\u53ea\u80fd\u8f93\u5165\u4e00\u884c\u7684\u7ec4\u4ef6\uff0c\u4f7f\u7528JTextField\u7ec4\u4ef6\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; var textfield = new JTextField()\r\n\r\njshell&gt; textfield.setColumns(15)\r\n\r\njshell&gt; panel.add(textfield)\r\n<\/code><\/pre>\n<p>\u901a\u8fc7 setColumns \u65b9\u6cd5\u8bbe\u7f6e\u5bbd\u5ea6\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/199-0.png\" alt=\"image.png\" \/><\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/200-0.png\" alt=\"image.png\" \/>\u8ba9\u6211\u4eec\u6700\u540e\u5c1d\u8bd5\u6dfb\u52a0\u6309\u94ae\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; var printButton = new JButton(\"Print\")\r\n\r\njshell&gt; printButton.addActionListener(ae -&gt; textarea.append(textfield.getText() + \"\\n\"))\r\n\r\njshell&gt; panel.add(printButton)\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/203-0.png\" alt=\"image.png\" \/>\u7ec3\u4e60\uff1a\u6dfb\u52a0\u4e00\u4e2a\u6309\u94ae\uff0c\u5f53\u70b9\u51fb\u65f6\u5728\u6587\u672c\u533a\u57df\u663e\u793a&#8221;Yeah!&#8221;\u3002<br \/>\n\u7ec3\u4e60\uff1a\u6dfb\u52a0\u4e00\u4e2a\u6309\u94ae\uff0c\u5c06\u8f93\u5165\u6846\u4e2d\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u5b57\u6bcd\uff0c\u5e76\u5c06\u7ed3\u679c\u8f93\u51fa\u5230\u6587\u672c\u533a\u57df\u3002\u8981\u5c06\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u6bcd\u8f6c\u6362\u4e3a\u5927\u5199\uff0c\u53ef\u4ee5\u4f7f\u7528toUpperCase\u65b9\u6cd5\u3002\u8bf7\u5148\u5728JShell\u4e0a\u5c1d\u8bd5\u4e00\u4e0btoUpperCase\u65b9\u6cd5\u7684\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<h2>\u79bb\u5f00 JShell \u6765\u7f16\u5199 Java \u7a0b\u5e8f<br \/>\n\u6700\u540e\uff0c\u8ba9\u6211\u4eec\u5c06\u4e4b\u524d\u5728JShell\u4e2d\u8bd5\u9a8c\u8fc7\u7684\u5185\u5bb9\u5199\u6210\u4e00\u4e2a\u72ec\u7acb\u7684Java\u7a0b\u5e8f\u3002\u8bf7\u5728\u8bb0\u4e8b\u672c\u6216\u6587\u672c\u7f16\u8f91\u5668\u4e2d\u8f93\u5165\u4ee5\u4e0b\u6e90\u4ee3\u7801\uff0c\u5e76\u5c06\u5176\u4fdd\u5b58\u4e3a\u540d\u4e3a&#8221;FirstWindow.java&#8221;\u7684\u6587\u4ef6\u653e\u7f6e\u5728\u684c\u9762\u4e0a\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">import<\/span> <span class=\"nn\">javax.swing.*<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">FirstWindow<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">...<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kt\">var<\/span> <span class=\"n\">frame<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">JFrame<\/span><span class=\"o\">(<\/span><span class=\"s\">\"test\"<\/span><span class=\"o\">);<\/span>\r\n\r\n    <span class=\"kt\">var<\/span> <span class=\"n\">textarea<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">JTextArea<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"n\">frame<\/span><span class=\"o\">.<\/span><span class=\"na\">add<\/span><span class=\"o\">(<\/span><span class=\"n\">textarea<\/span><span class=\"o\">);<\/span>\r\n\r\n    <span class=\"kt\">var<\/span> <span class=\"n\">textfield<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">JTextField<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"n\">textfield<\/span><span class=\"o\">.<\/span><span class=\"na\">setColumns<\/span><span class=\"o\">(<\/span><span class=\"mi\">15<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"kt\">var<\/span> <span class=\"n\">button<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">JButton<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Print\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"n\">button<\/span><span class=\"o\">.<\/span><span class=\"na\">addActionListener<\/span><span class=\"o\">(<\/span><span class=\"n\">ae<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"n\">textarea<\/span><span class=\"o\">.<\/span><span class=\"na\">append<\/span><span class=\"o\">(<\/span><span class=\"n\">textfield<\/span><span class=\"o\">.<\/span><span class=\"na\">getText<\/span><span class=\"o\">()<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\"\\n\"<\/span><span class=\"o\">));<\/span>\r\n\r\n    <span class=\"kt\">var<\/span> <span class=\"n\">panel<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">JPanel<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"n\">panel<\/span><span class=\"o\">.<\/span><span class=\"na\">add<\/span><span class=\"o\">(<\/span><span class=\"n\">textfield<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"n\">panel<\/span><span class=\"o\">.<\/span><span class=\"na\">add<\/span><span class=\"o\">(<\/span><span class=\"n\">button<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"n\">frame<\/span><span class=\"o\">.<\/span><span class=\"na\">add<\/span><span class=\"o\">(<\/span><span class=\"s\">\"North\"<\/span><span class=\"o\">,<\/span> <span class=\"n\">panel<\/span><span class=\"o\">);<\/span>\r\n\r\n    <span class=\"n\">frame<\/span><span class=\"o\">.<\/span><span class=\"na\">setDefaultCloseOperation<\/span><span class=\"o\">(<\/span><span class=\"nc\">JFrame<\/span><span class=\"o\">.<\/span><span class=\"na\">EXIT_ON_CLOSE<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"n\">frame<\/span><span class=\"o\">.<\/span><span class=\"na\">setSize<\/span><span class=\"o\">(<\/span><span class=\"mi\">400<\/span><span class=\"o\">,<\/span> <span class=\"mi\">300<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"n\">frame<\/span><span class=\"o\">.<\/span><span class=\"na\">show<\/span><span class=\"o\">();<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5728JShell\u4e2d\u6dfb\u52a0\u4e86\u4e00\u4e9b\u4e4b\u524d\u6ca1\u6709\u7684\u5185\u5bb9\u3002\u6b64\u5916\uff0c\u8f93\u5165\u5230JShell\u7684\u547d\u4ee4\u540e\u9762\u90fd\u6709\u5206\u53f7\uff08semicolon\uff09\u3002\u4f46\u662f\uff0c\u4e0e\u5f00\u59cb\u8fd9\u4e2a\u6559\u7a0b\u4e4b\u524d\u76f8\u6bd4\uff0c\u4f60\u53ef\u80fd\u4f1a\u6709\u4e00\u79cd\u201c\u6211\u80fd\u8bfb\u61c2\u4e86\uff01\u201d\u7684\u611f\u89c9\uff0c\u5bf9\u5417\uff1f<\/p>\n<p>\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u5c1d\u8bd5\u8fd0\u884c\u8fd9\u6bb5\u6e90\u4ee3\u7801\u3002<br \/>\n\u8bf7\u6253\u5f00\u547d\u4ee4\u63d0\u793a\u7b26\u3002\u8fd9\u6b21\u4e0d\u4f7f\u7528JShell\u3002<br \/>\n\u4f7f\u7528cd\u547d\u4ee4\u5207\u6362\u5230\u684c\u9762\u3002<\/p>\n<pre class=\"post-pre\"><code>$ cd Desktop\r\n<\/code><\/pre>\n<p>\u63a5\u7740\uff0c\u4f7f\u7528javac\u547d\u4ee4\u7f16\u8bd1\u5148\u524d\u8f93\u5165\u7684\u6e90\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code>$ javac FirstWindow.java\r\n<\/code><\/pre>\n<p>\u5982\u679c\u53d1\u751f\u9519\u8bef\uff0c\u8bf7\u8fdb\u884c\u66f4\u6b63\u5e76\u4fdd\u5b58\uff0c\u7136\u540e\u518d\u8fdb\u884c\u7f16\u8bd1\u3002<br \/>\n\u5f53\u9519\u8bef\u6d88\u5931\u65f6\uff0c\u8bf7\u68c0\u67e5\u6240\u521b\u5efa\u7684\u6587\u4ef6\u3002<br \/>\n\u5728Windows\u4e2d\u4f7f\u7528dir\u547d\u4ee4\uff0c\u5728Mac\u548cLinux\u4e2d\u4f7f\u7528ls\u547d\u4ee4\u3002<\/p>\n<pre class=\"post-pre\"><code>$ dir FirstWindow.*\r\n<\/code><\/pre>\n<p>\u7b2c\u4e00\u500b\u8996\u7a97\u7684.class\u6a94\u6848\u5df2\u7d93\u5efa\u7acb\u4e86\uff0c\u9019\u5c31\u662fJava\u7684\u57f7\u884c\u7a0b\u5f0f\u78bc\u3002\u8981\u57f7\u884c\u5b83\uff0c\u6211\u5011\u9700\u8981\u4f7f\u7528java\u547d\u4ee4\u3002<\/p>\n<pre class=\"post-pre\"><code>$ java FirstWindow\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0bc937434c4406be7125\/217-0.png\" alt=\"image.png\" \/>\u8bf7\u4ece\u8fd9\u91cc\u5f00\u59cb\u8fdb\u884cJava\u7684\u6df1\u5165\u5b66\u4e60\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8ba9\u6211\u4eec\u5728JShell\u4e0a\u5f00\u59cb\u5b66\u4e60Java\u5427\u3002 \u4e3a\u4e86\u4ec0\u4e48\u800c\u505a\u6ca1\u6709\u7f16\u7a0b\u7ecf\u9a8c\u7684\u4eba\u80fd\u591f\u5927\u81f4\u7406\u89e3Java\u7f16\u7a0b\u4e2d\u6d89\u53ca\u7684\u5404\u79cd\u6982 [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31281","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>\u7528JShell\u5f00\u59cb\u5b66\u4e60Java - \u4e00\u7aa5Java\u7684\u4e16\u754c - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e\u7528JShell\u5f00\u59cb\u5b66\u4e60Java - \u4e00\u7aa5Java\u7684\u4e16\u754c\u7684\u6280\u672f\u6587\u7ae0\" \/>\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\/\u7528jshell\u5f00\u59cb\u5b66\u4e60java-\u4e00\u7aa5java\u7684\u4e16\u754c\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u7528JShell\u5f00\u59cb\u5b66\u4e60Java - \u4e00\u7aa5Java\u7684\u4e16\u754c\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8e\u7528JShell\u5f00\u59cb\u5b66\u4e60Java - \u4e00\u7aa5Java\u7684\u4e16\u754c\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u7528jshell\u5f00\u59cb\u5b66\u4e60java-\u4e00\u7aa5java\u7684\u4e16\u754c\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-06-23T16:11:22+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-12T15:13:44+00:00\" \/>\n<meta property=\"og:image\" 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