{"id":1565,"date":"2026-06-11T10:56:07","date_gmt":"2026-06-11T02:56:07","guid":{"rendered":"https:\/\/yunyanglib.cn\/?p=1565"},"modified":"2026-06-11T10:56:09","modified_gmt":"2026-06-11T02:56:09","slug":"%e3%80%90java%e3%80%91scanner-%e5%b7%a5%e5%85%b7%e7%b1%bb%e5%85%a8%e6%96%b9%e4%bd%8d%e4%bd%bf%e7%94%a8%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/yunyanglib.cn\/?p=1565","title":{"rendered":"\u3010Java\u3011Scanner \u5de5\u5177\u7c7b\u5168\u65b9\u4f4d\u4f7f\u7528\u8be6\u89e3"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u54c8\u55bd\u5404\u4f4d\u5c0f\u4f19\u4f34\uff0cScanner \u4f5c\u4e3a Java \u6700\u5e38\u7528\u7684\u8f93\u5165\u626b\u63cf\u5de5\u5177\uff0c\u65e2\u80fd\u8bfb\u53d6\u63a7\u5236\u53f0\u952e\u76d8\u8f93\u5165\uff0c\u4e5f\u53ef\u4ee5\u8bfb\u53d6\u672c\u5730\u6587\u4ef6\u5185\u5bb9\uff0c\u8fd8\u652f\u6301\u6b63\u5219\u5339\u914d\u67e5\u627e\uff0c\u65e5\u5e38\u7ec3\u624b\u3001\u5c0f\u578b\u9879\u76ee\u63a5\u6536\u7528\u6237\u8f93\u5165\u57fa\u672c\u79bb\u4e0d\u5f00\u5b83\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001Scanner \u626b\u63cf\u63a7\u5236\u53f0\u8f93\u5165<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Scanner \u6838\u5fc3\u5206\u4e3a<code>nextXxx()<\/code>\u7cfb\u5217\u65b9\u6cd5\u548c<code>nextLine()<\/code>\uff0c\u4e8c\u8005\u6362\u884c\u5904\u7406\u903b\u8f91\u5dee\u5f02\u5f88\u5927\uff0c\u4e5f\u662f\u65b0\u624b\u6700\u5bb9\u6613\u8e29\u5751\u7684\u5730\u65b9\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. nextInt ()\u3001next () \u8fd9\u7c7b\u975e\u6574\u884c\u8bfb\u53d6\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>nextInt()<\/code>\uff1a\u8bfb\u53d6\u63a7\u5236\u53f0\u6574\u6570\uff0c\u9047\u5230\u7a7a\u683c\u3001\u56de\u8f66\u3001\u5236\u8868\u7b26\u5c31\u622a\u6b62\uff1b\u5982\u679c\u8f93\u5165\u975e\u6570\u5b57\uff0c\u76f4\u63a5\u629b\u51fa<code>InputMismatchException<\/code>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>next()<\/code>\uff1a\u8bfb\u53d6\u5355\u4e2a\u6807\u8bb0\uff0c\u4ee5\u7a7a\u767d\u5b57\u7b26\uff08\u7a7a\u683c\u3001\u6362\u884c\uff09\u4f5c\u4e3a\u5206\u9694\uff0c\u65e0\u6cd5\u8bfb\u53d6\u5e26\u7a7a\u683c\u7684\u5b8c\u6574\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b\u4ee3\u7801\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.Scanner;\n\npublic class ScannerTest {\n    public static void main(String&#91;] args) {\n        Scanner sc = new Scanner(System.in);\n        System.out.print(\"\u8bf7\u8f93\u5165\u4e00\u4e2a\u6574\u6570\uff1a\");\n        int num = sc.nextInt();\n        System.out.println(\"\u4f60\u8f93\u5165\u7684\u6570\u5b57\uff1a\" + num);\n\n        System.out.print(\"\u8bf7\u8f93\u5165\u4e0d\u5e26\u7a7a\u683c\u7684\u5b57\u7b26\u4e32\uff1a\");\n        String str = sc.next();\n        System.out.println(\"\u63a5\u6536\u5185\u5bb9\uff1a\" + str);\n        sc.close();\n    }\n}\n<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u5751\u70b9\u63d0\u9192\uff1a<code>nextInt()<\/code>\u8bfb\u53d6\u6570\u5b57\u540e\uff0c<strong>\u7f13\u51b2\u533a\u4f1a\u6b8b\u7559\u6362\u884c\u7b26<code>\\n<\/code><\/strong>\uff0c\u7d27\u63a5\u7740\u8c03\u7528<code>nextLine()<\/code>\u4f1a\u76f4\u63a5\u8bfb\u5230\u7a7a\u5b57\u7b26\u4e32\uff0c\u540e\u9762\u4f1a\u6f14\u793a\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">2. nextLine () \u6574\u884c\u8bfb\u53d6<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>nextLine()<\/code>\uff1a\u4ece\u5f53\u524d\u6e38\u6807\u4f4d\u7f6e\u4e00\u76f4\u8bfb\u53d6\u5230\u6362\u884c\u7b26<code>\\n<\/code>\u4e3a\u6b62\uff0c\u4e00\u6b21\u6027\u63a5\u6536\u4e00\u6574\u884c\u5185\u5bb9\uff08\u5305\u542b\u7a7a\u683c\uff09\uff0c\u8bfb\u53d6\u7ed3\u675f\u540e\u6e38\u6807\u81ea\u52a8\u8df3\u5230\u4e0b\u4e00\u884c\u5f00\u5934\uff0c\u9002\u5408\u63a5\u6536\u5e26\u7a7a\u683c\u7684\u7528\u6237\u8f93\u5165\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u89c4\u907f\u6362\u884c\u6b8b\u7559 bug \u4ee3\u7801\u793a\u4f8b\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.Scanner;\n\npublic class NextLineDemo {\n    public static void main(String&#91;] args) {\n        Scanner sc = new Scanner(System.in);\n        System.out.print(\"\u8f93\u5165\u5e74\u9f84\uff1a\");\n        int age = sc.nextInt();\n        \/\/ \u5403\u6389\u7f13\u51b2\u533a\u9057\u7559\u7684\u6362\u884c\uff0c\u907f\u514dnextLine\u76f4\u63a5\u7a7a\u8bfb\n        sc.nextLine();\n\n        System.out.print(\"\u8f93\u5165\u59d3\u540d\uff08\u53ef\u5e26\u7a7a\u683c\uff09\uff1a\");\n        String name = sc.nextLine();\n        System.out.println(\"\u59d3\u540d\uff1a\" + name + \"\uff0c\u5e74\u9f84\uff1a\" + age);\n        sc.close();\n    }\n}\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3. hasNext \u7cfb\u5217\u5224\u65ad\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>hasNext()<\/code>\uff1a\u5224\u65ad\u662f\u5426\u8fd8\u6709\u4e0b\u4e00\u4e2a\u7a7a\u767d\u5206\u9694\u7684\u8f93\u5165\u6807\u8bb0\uff1b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>hasNextLine()<\/code>\uff1a\u5224\u65ad\u8f93\u5165\u6d41\u662f\u5426\u8fd8\u6709\u4e0b\u4e00\u884c\u6570\u636e\uff1b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u65e5\u5e38\u5faa\u73af\u8bfb\u53d6\u4e0d\u786e\u5b9a\u957f\u5ea6\u8f93\u5165\u65f6\u7ecf\u5e38\u642d\u914d\u4f7f\u7528\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Scanner sc = new Scanner(System.in);\nSystem.out.println(\"\u8fde\u7eed\u8f93\u5165\u6570\u5b57\uff0c\u8f93\u5165\u975e\u6570\u5b57\u7ed3\u675f\uff1a\");\nwhile (sc.hasNextInt()){\n    int temp = sc.nextInt();\n    System.out.println(\"\u6536\u5230\uff1a\"+temp);\n}\nsc.close();\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u9664\u6b64\u4e4b\u5916\u8fd8\u6709<code>nextDouble()<\/code>\u3001<code>hasNextDouble()<\/code>\uff0c\u7528\u6765\u8bfb\u53d6\u6d6e\u70b9\u578b\u6570\u636e\uff0c\u7528\u6cd5\u548c nextInt \u57fa\u672c\u4e00\u81f4\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001Scanner \u626b\u63cf\u672c\u5730\u6587\u4ef6<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Scanner \u4e0d\u6b62\u80fd\u7ed1\u5b9a<code>System.in<\/code>\u63a7\u5236\u53f0\uff0c\u8fd8\u53ef\u4ee5\u4f20\u5165 File \u5bf9\u8c61\u5b9e\u73b0\u6587\u4ef6\u5185\u5bb9\u8bfb\u53d6\uff0c\u5206<strong>\u9010\u884c\u8bfb\u53d6<\/strong>\u548c<strong>\u5168\u5185\u5bb9\u8bfb\u53d6<\/strong>\u4e24\u79cd\u573a\u666f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u9010\u884c\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.File;\nimport java.io.FileNotFoundException;\nimport java.util.Scanner;\n\npublic class ReadFileByLine {\n    public static void main(String&#91;] args) {\n        File file = new File(\"test.txt\");\n        try {\n            Scanner sc = new Scanner(file);\n            \/\/ \u5faa\u73af\u5224\u65ad\u662f\u5426\u8fd8\u6709\u4e0b\u4e00\u884c\n            while (sc.hasNextLine()){\n                String line = sc.nextLine();\n                System.out.println(line);\n            }\n            sc.close();\n        } catch (FileNotFoundException e) {\n            e.printStackTrace();\n            System.out.println(\"\u6587\u4ef6\u4e0d\u5b58\u5728\uff01\");\n        }\n    }\n}\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u8bfb\u53d6\u6574\u4e2a\u6587\u4ef6\u5185\u5bb9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u501f\u52a9\u5206\u9694\u7b26\u66ff\u6362\uff0c\u628a\u6574\u4e2a\u6587\u4ef6\u5f53\u505a\u4e00\u4e2a\u6574\u4f53\u8bfb\u53d6\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Scanner sc = new Scanner(new File(\"test.txt\"));\n\/\/ \u5c06\u6587\u4ef6\u5206\u9694\u7b26\u8bbe\u7f6e\u4e3a\u7a7a\uff0c\u4e00\u6b21\u6027\u8bfb\u53d6\u5168\u90e8\u6587\u672c\nsc.useDelimiter(\"\\\\Z\");\nString allContent = sc.next();\nSystem.out.println(allContent);\nsc.close();\n<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\uff1a\u6587\u4ef6\u64cd\u4f5c\u5fc5\u987b\u6355\u83b7\u6587\u4ef6\u4e0d\u5b58\u5728\u5f02\u5e38<code>FileNotFoundException<\/code>\u3002<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001Scanner \u7ed3\u5408\u6b63\u5219\u67e5\u627e\u5339\u914d\u5185\u5bb9<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Scanner \u5185\u7f6e<code>findInLine()<\/code>\u3001<code>findWithinHorizon()<\/code>\u4e24\u4e2a\u65b9\u6cd5\uff0c\u652f\u6301\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u7528\u6765\u5728\u5b57\u7b26\u4e32 \/ \u6587\u4ef6\u4e2d\u67e5\u627e\u6307\u5b9a\u5173\u952e\u5b57\uff0c\u662f\u7b80\u6613\u6587\u672c\u68c0\u7d22\u7684\u5229\u5668\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>findInLine(String regex)<\/code>\uff1a\u5728\u5f53\u524d\u884c\u4e2d\u5339\u914d\u6b63\u5219\uff0c\u627e\u5230\u7b2c\u4e00\u4e2a\u7b26\u5408\u5185\u5bb9\u5c31\u8fd4\u56de\uff1b<\/li>\n\n\n\n<li><code>findWithinHorizon(String regex,int horizon)<\/code>\uff1a\u9650\u5b9a\u67e5\u627e\u5b57\u7b26\u957f\u5ea6\u8303\u56f4\uff0c\u5168\u5c40\u5339\u914d\u67e5\u627e\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b\uff1a\u5728\u6587\u672c\u4e2d\u67e5\u627e\u6240\u6709\u6570\u5b57<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.Scanner;\n\npublic class FindWordDemo {\n    public static void main(String&#91;] args) {\n        String content = \"\u8ba2\u53551001\uff0c\u91d1\u989d299.9\u5143\uff0c\u7f16\u53f78856\";\n        Scanner sc = new Scanner(content);\n        \/\/ \u6b63\u5219\u5339\u914d\u6570\u5b57\n        String reg = \"\\\\d+\";\n        String res;\n        while ((res = sc.findInLine(reg)) != null){\n            System.out.println(\"\u5339\u914d\u6570\u5b57\uff1a\"+res);\n        }\n        sc.close();\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u540c\u6837\u53ef\u4ee5\u628a\u6570\u636e\u6e90\u6362\u6210 File \u6587\u4ef6\uff0c\u5b9e\u73b0\u4ece\u6587\u6863\u4e2d\u6279\u91cf\u68c0\u7d22\u5173\u952e\u8bcd\uff0c\u505a\u7b80\u5355\u65e5\u5fd7\u7b5b\u9009\u975e\u5e38\u65b9\u4fbf\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u603b\u7ed3<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u63a7\u5236\u53f0\u8f93\u5165\uff1a\u9700\u8981\u6574\u884c\u5e26\u7a7a\u683c\u5185\u5bb9\u7528<code>nextLine()<\/code>\uff0c\u5355\u4e2a\u6570\u503c \/ \u5355\u8bcd\u7528<code>nextInt\/next<\/code>\uff0c\u6df7\u7528\u8bb0\u5f97\u7528\u7a7a nextLine \u5403\u6389\u6b8b\u7559\u6362\u884c\uff1b<\/li>\n\n\n\n<li>\u6587\u4ef6\u8bfb\u53d6\uff1aScanner \u7b80\u5316\u4e86 IO \u8bfb\u53d6\u4ee3\u7801\uff0c\u76f8\u6bd4\u539f\u751f\u5b57\u7b26\u6d41\u5199\u6cd5\u66f4\u7b80\u6d01\uff0c\u5c0f\u6587\u4ef6\u8bfb\u53d6\u9996\u9009\uff1b<\/li>\n\n\n\n<li>\u6b63\u5219\u68c0\u7d22\uff1afind \u7cfb\u5217\u65b9\u6cd5\u642d\u914d\u6b63\u5219\uff0c\u5feb\u901f\u5b9e\u73b0\u7b80\u6613\u6587\u672c\u67e5\u627e\uff0c\u4e0d\u7528\u624b\u5199\u590d\u6742\u5b57\u7b26\u4e32\u622a\u53d6\uff1b<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u54c8\u55bd\u5404\u4f4d\u5c0f\u4f19\u4f34\uff0cScanner \u4f5c\u4e3a Java \u6700\u5e38\u7528\u7684\u8f93\u5165\u626b\u63cf\u5de5\u5177\uff0c\u65e2\u80fd\u8bfb\u53d6\u63a7\u5236\u53f0\u952e\u76d8\u8f93\u5165\uff0c\u4e5f\u53ef\u4ee5\u8bfb\u53d6\u672c\u5730\u6587<\/p>\n<div class=\"more-link\">\n\t\t\t\t <a href=\"https:\/\/yunyanglib.cn\/?p=1565\" 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":1566,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[15],"class_list":["post-1565","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\/1565","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=1565"}],"version-history":[{"count":3,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1565\/revisions"}],"predecessor-version":[{"id":1569,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/1565\/revisions\/1569"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/media\/1566"}],"wp:attachment":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1565"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1565"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1565"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}