{"id":393,"date":"2022-10-25T14:52:05","date_gmt":"2022-08-18T14:07:10","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java-repl%ef%bc%88%e4%ba%a4%e4%ba%92%e5%bc%8f%e8%a7%a3%e9%87%8a%e5%99%a8%ef%bc%89-jshell\/"},"modified":"2025-08-02T03:56:10","modified_gmt":"2025-08-01T19:56:10","slug":"java-repl%ef%bc%88%e4%ba%a4%e4%ba%92%e5%bc%8f%e8%a7%a3%e9%87%8a%e5%99%a8%ef%bc%89-jshell","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-repl%ef%bc%88%e4%ba%a4%e4%ba%92%e5%bc%8f%e8%a7%a3%e9%87%8a%e5%99%a8%ef%bc%89-jshell\/","title":{"rendered":"Java jshell\u6559\u7a0b\uff1a\u5b66\u4e60Java\u4ea4\u4e92\u5f0f\u89e3\u91ca\u5668(REPL)\u7684\u4f7f\u7528\u65b9\u6cd5"},"content":{"rendered":"<p>\u8fd9\u662f\u6587\u7ae0\u300aJava REPL\uff08\u4ea4\u4e92\u5f0f\u89e3\u91ca\u5668\uff09- jshell\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51711\u90e8\u5206\uff09\u3002<\/p>\n<p>\u5185\u5bb9\u7247\u6bb5: Java REPL \u6216\u8005 jshell \u662f\u5728 Java 9 \u4e2d\u5f15\u5165\u7684\u65b0\u5de5\u5177\u3002\u4eca\u5929\uff0c\u6211\u4eec\u5c06\u91cd\u70b9\u4ecb\u7ecd Java REPL \u7684\u57fa\u7840\u77e5\u8bc6\uff0c\u5e76\u5728 jshell \u63a5\u53e3\u4e2d\u8fd0\u884c\u4e00\u4e9b\u6d4b\u8bd5\u7a0b\u5e8f\u3002<\/p>\n<h2>Java REPL \u662f\u5373\u65f6\u8fd0\u884c\u73af\u5883\u7684\u4e00\u4e2a\u7248\u672c\uff0c\u5b83\u5141\u8bb8\u7528\u6237\u76f4\u63a5\u5728\u547d\u4ee4\u884c\u4e2d\u7f16\u5199\u548c\u8fd0\u884c Java \u4ee3\u7801\u3002<\/h2>\n<p>\u8ba9\u6211\u4eec\u9996\u5148\u8bd5\u7740\u7406\u89e3\u4e3a\u4ec0\u4e48Java\u4e2d\u6dfb\u52a0\u4e86REPL\u652f\u6301\uff0c\u5982\u679c\u8fd9\u6837\u91cd\u8981\u7684\u8bdd\uff0c\u4e3a\u4ec0\u4e48\u8fd9\u4e48\u665a\u624d\u53d1\u5e03\u3002\u5982\u4f60\u6240\u77e5\uff0c\u7531\u4e8e\u5176\u7279\u6027\u548c\u4f18\u70b9\uff0cScala\u5df2\u7ecf\u975e\u5e38\u6d41\u884c\u7528\u4e8e\u5f00\u53d1\u5c0f\u5230\u5927\u89c4\u6a21\u7684\u5e94\u7528\u7a0b\u5e8f\u3002\u5b83\u652f\u6301\u591a\u8303\u5f0f\uff08\u9762\u5411\u5bf9\u8c61\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b\uff09\u548cREPL\u3002Oracle\u516c\u53f8\u6b63\u5728\u5c1d\u8bd5\u5c06\u5927\u90e8\u5206Scala\u7684\u7279\u6027\u6574\u5408\u5230Java\u4e2d\u3002\u4ed6\u4eec\u5df2\u7ecf\u4f5c\u4e3aJava 8\u7684\u4e00\u90e8\u5206\u6574\u5408\u4e86\u4e00\u4e9b\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027\uff0c\u6bd4\u5982lambda\u8868\u8fbe\u5f0f\u3002Scala\u7684\u6700\u597d\u7279\u6027\u4e4b\u4e00\u5c31\u662fREPL\uff08\u8bfb\u53d6-\u6c42\u503c-\u6253\u5370-\u5faa\u73af\uff09\u3002\u5b83\u662f\u4e00\u4e2a\u547d\u4ee4\u884c\u754c\u9762\u548cScala\u89e3\u91ca\u5668\uff0c\u7528\u4e8e\u6267\u884cScala\u7a0b\u5e8f\u3002\u4f7f\u7528Scala REPL\u5f88\u5bb9\u6613\u5b66\u4e60Scala\u7f16\u7a0b\u7684\u57fa\u7840\u77e5\u8bc6\uff0c\u751a\u81f3\u8fd0\u884c\u5c0f\u7684\u6d4b\u8bd5\u4ee3\u7801\u3002\u7531\u4e8eScala REPL\u53ca\u5176\u51cf\u5c11\u5b66\u4e60\u66f2\u7ebf\u548c\u4fbf\u4e8e\u8fd0\u884c\u6d4b\u8bd5\u4ee3\u7801\u7684\u597d\u5904\uff0cJava\u5728Java 9\u4e2d\u5f15\u5165\u4e86REPL\u3002<\/p>\n<h3>Java\u7684REPL &#8211; jshell<\/h3>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647bd1a4b2f92e6c72c588\/4-0.png\" alt=\"java repl, jshell\" \/><\/div>\n<h3>Java REPL &#8211; jshell \u57fa\u7840\u77e5\u8bc6<\/h3>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647bd1a4b2f92e6c72c588\/6-0.png\" alt=\"java repl\" \/><\/div>\n<pre class=\"post-pre\"><code>james:~ james$ jshell \r\n|  \u6b22\u8fce\u4f7f\u7528 JShell -- \u7248\u672c 9\r\n|  \u8f93\u5165\u4ee5\u4e0b\u5185\u5bb9\u83b7\u53d6\u4ecb\u7ecd: \/help intro\r\n\r\njshell&gt; \r\n\r\njshell&gt; System.out.println(\"Hello World\");\r\nHello World\r\n\r\njshell&gt; String str = \"Hello JournalDev Users\"\r\nstr ==&gt; \"Hello JournalDev Users\"\r\n\r\njshell&gt; str\r\nstr ==&gt; \"Hello JournalDev Users\"\r\n\r\njshell&gt; System.out.println(str)\r\nHello JournalDev Users\r\n\r\njshell&gt; int counter = 0\r\ncounter ==&gt; 0\r\n\r\njshell&gt; counter++\r\n$6 ==&gt; 0\r\n\r\njshell&gt; counter\r\ncounter ==&gt; 1\r\n\r\njshell&gt; counter+5\r\n$8 ==&gt; 6\r\n\r\njshell&gt; counter\r\ncounter ==&gt; 1\r\n\r\njshell&gt; counter=counter+5\r\ncounter ==&gt; 6\r\n\r\njshell&gt; counter\r\ncounter ==&gt; 6\r\n\r\njshell&gt; \r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647bd1a4b2f92e6c72c588\/8-0.png\" alt=\"java repl example\" \/><\/div>\n<h3>Java REPL &#8211; \u6267\u884c\u7c7b<\/h3>\n<p>\u6211\u4eec\u4e5f\u53ef\u4ee5\u5728Java REPL Shell\u4e2d\u5b9a\u4e49\u548c\u6267\u884c\u7c7b\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; class Hello {\r\n   ...&gt; public static void sayHello() {\r\n   ...&gt; System.out.print(\"Hello\");\r\n   ...&gt; }\r\n   ...&gt; }\r\n|  \u5df2\u521b\u5efa\u7c7b Hello\r\n\r\njshell&gt; Hello.sayHello()\r\nHello\r\njshell&gt; \r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65647bd1a4b2f92e6c72c588\/12-0.png\" alt=\"java repl class\" \/><\/div>\n<h3>Java REPL &#8211; \u5e2e\u52a9\u548c\u9000\u51fa<\/h3>\n<p>\u8981\u83b7\u53d6jshell\u5de5\u5177\u7684\u5e2e\u52a9\u90e8\u5206\uff0c\u8bf7\u4f7f\u7528\/help\u547d\u4ee4\u3002\u8981\u9000\u51fajshell\uff0c\u8bf7\u4f7f\u7528\/exit\u547d\u4ee4\u3002<\/p>\n<pre class=\"post-pre\"><code>jshell&gt; \/help\r\n|  \u8f93\u5165 Java \u8bed\u8a00\u8868\u8fbe\u5f0f\u3001\u8bed\u53e5\u6216\u58f0\u660e\u3002\r\n|  \u6216\u8f93\u5165\u4ee5\u4e0b\u547d\u4ee4\u4e4b\u4e00\uff1a\r\n|  \/list [&lt;\u540d\u79f0\u6216\u6807\u8bc6\u7b26&gt;|-all|-start]\r\n|  \t\u5217\u51fa\u60a8\u5df2\u8f93\u5165\u7684\u6e90\u4ee3\u7801\r\n|  \/edit &lt;\u540d\u79f0\u6216\u6807\u8bc6\u7b26&gt;\r\n...\r\n\r\njshell&gt; \/exit\r\n|  \u518d\u89c1\r\nscdev:~ scdev$ \r\n<\/code><\/pre>\n<p>\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528Ctrl + D\u547d\u4ee4\u4ecejshell\u5de5\u5177\u4e2d\u9000\u51fa\u3002\u8fd9\u5c31\u662f\u5173\u4e8eJava REPL\u548cjshell\u5de5\u5177\u57fa\u7840\u7684\u5168\u90e8\u5185\u5bb9\uff0c\u8bf7\u5728jshell &#8211; java shell\u4e0a\u9605\u8bfb\u66f4\u591a\u4fe1\u606f\u3002\u53c2\u8003\u8d44\u6599\uff1aJEP 222\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u662f\u6587\u7ae0\u300aJava REPL\uff08\u4ea4\u4e92\u5f0f\u89e3\u91ca\u5668\uff09- jshell\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51711\u90e8\u5206\uff09\u3002 \u5185\u5bb9\u7247\u6bb5: Java  [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1276,1273,1275,1274,1277],"class_list":["post-393","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-java-9","tag-java-jshell","tag-java-repl","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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