{"id":115988,"date":"2024-03-23T04:53:55","date_gmt":"2024-03-22T19:53:55","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%81%ae%e7%ae%97%e8%a1%93%e5%bc%8f%e3%81%ae%e8%a9%95%e4%be%a1%e6%96%b9%e6%b3%95\/"},"modified":"2024-04-05T07:21:55","modified_gmt":"2024-04-04T22:21:55","slug":"java%e3%81%a7%e3%81%ae%e7%ae%97%e8%a1%93%e5%bc%8f%e3%81%ae%e8%a9%95%e4%be%a1%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%81%ae%e7%ae%97%e8%a1%93%e5%bc%8f%e3%81%ae%e8%a9%95%e4%be%a1%e6%96%b9%e6%b3%95\/","title":{"rendered":"Java\u3067\u306e\u7b97\u8853\u5f0f\u306e\u8a55\u4fa1\u65b9\u6cd5"},"content":{"rendered":"<p>\u30b9\u30bf\u30c3\u30af\u3092\u4f7f\u7528\u3057\u3066\u7b97\u8853\u5f0f\u3092\u8a55\u4fa1\u3067\u304d\u307e\u3059\u3002\u624b\u9806\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<ol>\n<li>\u6f14\u7b97\u5b50\u3092\u5165\u308c\u308b\u6f14\u7b97\u5b50\u30b9\u30bf\u30c3\u30af\u3068\u3001\u6570\u5024\u3092\u5165\u308c\u308b\u6570\u5024\u30b9\u30bf\u30c3\u30af\u30922\u3064\u7528\u610f\u3057\u307e\u3059\u3002<\/li>\n<li>\u30b9\u30da\u30fc\u30b9\u6587\u5b57\u306f\u7121\u8996\u3057\u307e\u3059\u3002<\/li>\n<li>\u6570\u5b57\u3060\u3063\u305f\u3089\u6570\u5024\u306b\u5909\u63db\u3057\u3001numberStack\u306b\u30d7\u30c3\u30b7\u30e5<\/li>\n<li>\u6587\u5b57\u304c'(\u2019\u306e\u5834\u5408\u3001operatorStack\u306b\u30d7\u30c3\u30b7\u30e5\u3059\u308b\u3002<\/li>\n<li>&#8216;)&#8217; \u6587\u5b57\u3067\u3042\u308c\u3070\u3001'(&#8216; \u306b\u81f3\u308b\u307e\u3067 operatorStack \u304b\u3089\u30aa\u30da\u30e9\u30f3\u30c9\u3092\u53d6\u308a\u51fa\u3059\u3002 \u53d6\u308a\u51fa\u3057\u305f\u30aa\u30da\u30e9\u30f3\u30c9\u6bce\u306b\u3001 numberStack \u304b\u3089\u30aa\u30da\u30e9\u30f3\u30c9\u3092 2 \u3064\u53d6\u308a\u51fa\u3057\u6f14\u7b97\u3092\u884c\u3044\u3001\u305d\u306e\u7d50\u679c\u3092 numberStack \u306b\u5165\u308c\u308b\u3002<\/li>\n<li>\u6f14\u7b97\u5b50\u3060\u3063\u305f\u5834\u5408\u306f\u30012\u901a\u308a\u306b\u5206\u5c90\u3057\u307e\u3059\u3002operatorStack\u304c\u7a7a\u3067\u3042\u3063\u305f\u5834\u5408\u3001\u307e\u305f\u306f\u30b9\u30bf\u30c3\u30af\u6700\u4e0a\u90e8\u306e\u6f14\u7b97\u5b50\u304c\u300c(\u300d\u3060\u3063\u305f\u5834\u5408\u306f\u3001\u6f14\u7b97\u5b50\u3092\u76f4\u63a5operatorStack\u306b\u683c\u7d0d\u3057\u307e\u3059\u3002<br \/>\n\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306f\u3001\u73fe\u5728\u4f4d\u7f6e\u306e\u6f14\u7b97\u5b50\u3068\u3001\u30b9\u30bf\u30c3\u30af\u6700\u4e0a\u90e8\u306e\u6f14\u7b97\u5b50\u3068\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002\u73fe\u5728\u4f4d\u7f6e\u306e\u6f14\u7b97\u5b50\u306e\u512a\u5148\u9806\u4f4d\u304c\u3001\u30b9\u30bf\u30c3\u30af\u6700\u4e0a\u90e8\u306e\u6f14\u7b97\u5b50\u4ee5\u4e0b\u3060\u3063\u305f\u5834\u5408\u306f\u3001operatorStack\u304b\u3089\u6f14\u7b97\u5b50\u3092\u53d6\u308a\u51fa\u3057\u3001numberStack\u304b\u30892\u3064\u306e\u88ab\u6f14\u7b97\u5b50\u3092\u53d6\u308a\u51fa\u3057\u3066\u6f14\u7b97\u3092\u884c\u3044\u307e\u3059\u3001\u305d\u306e\u6f14\u7b97\u7d50\u679c\u3092numberStack\u306b\u683c\u7d0d\u3057\u307e\u3059\u3002\u3053\u306e\u64cd\u4f5c\u3092\u3001\u73fe\u5728\u4f4d\u7f6e\u306e\u6f14\u7b97\u5b50\u306e\u512a\u5148\u9806\u4f4d\u304c\u30b9\u30bf\u30c3\u30af\u6700\u4e0a\u90e8\u306e\u6f14\u7b97\u5b50\u3088\u308a\u5927\u304d\u304f\u306a\u308b\u3001\u307e\u305f\u306foperatorStack\u304c\u7a7a\u306b\u306a\u308b\u307e\u3067\u7e70\u308a\u8fd4\u3057\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001\u73fe\u5728\u4f4d\u7f6e\u306e\u6f14\u7b97\u5b50\u3092operatorStack\u306b\u683c\u7d0d\u3057\u307e\u3059\u3002<\/li>\n<li>\u5404\u6570\u5024\u3092\u30b9\u30bf\u30c3\u30af\u304b\u3089\u53d6\u308a\u51fa\u3057\u3066\u6f14\u7b97\u3092\u884c\u3044\u3001\u7d50\u679c\u3092\u30b9\u30bf\u30c3\u30af\u306b\u623b\u3059\u3002\u30aa\u30da\u30ec\u30fc\u30bf\u30b9\u30bf\u30c3\u30af\u304c\u7a7a\u306b\u306a\u308b\u307e\u3067\u3053\u306e\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3059\u3002<\/li>\n<li>\u6700\u5f8c\u306b\u3001numberStack \u306b\u6b8b\u3063\u305f\u5358\u4e00\u306e\u8981\u7d20\u304c\u3001\u5f0f\u3092\u8868\u3059\u5024\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.util.Stack;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">ExpressionEvaluation<\/span> {\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">double<\/span> <span class=\"hljs-title function_\">evaluateExpression<\/span><span class=\"hljs-params\">(String expression)<\/span> {\r\n        Stack&lt;Character&gt; operatorStack = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Stack<\/span>&lt;&gt;();\r\n        Stack&lt;Double&gt; numberStack = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Stack<\/span>&lt;&gt;();\r\n\r\n        <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">i<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">0<\/span>; i &lt; expression.length(); i++) {\r\n            <span class=\"hljs-type\">char<\/span> <span class=\"hljs-variable\">c<\/span> <span class=\"hljs-operator\">=<\/span> expression.charAt(i);\r\n\r\n            <span class=\"hljs-keyword\">if<\/span> (c == <span class=\"hljs-string\">' '<\/span>) {\r\n                <span class=\"hljs-keyword\">continue<\/span>;\r\n            } <span class=\"hljs-keyword\">else<\/span> <span class=\"hljs-keyword\">if<\/span> (Character.isDigit(c)) {\r\n                <span class=\"hljs-type\">StringBuilder<\/span> <span class=\"hljs-variable\">sb<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">StringBuilder<\/span>();\r\n                <span class=\"hljs-keyword\">while<\/span> (i &lt; expression.length() &amp;&amp; (Character.isDigit(expression.charAt(i)) || expression.charAt(i) == <span class=\"hljs-string\">'.'<\/span>)) {\r\n                    sb.append(expression.charAt(i));\r\n                    i++;\r\n                }\r\n                i--;\r\n\r\n                <span class=\"hljs-type\">double<\/span> <span class=\"hljs-variable\">number<\/span> <span class=\"hljs-operator\">=<\/span> Double.parseDouble(sb.toString());\r\n                numberStack.push(number);\r\n            } <span class=\"hljs-keyword\">else<\/span> <span class=\"hljs-keyword\">if<\/span> (c == <span class=\"hljs-string\">'('<\/span>) {\r\n                operatorStack.push(c);\r\n            } <span class=\"hljs-keyword\">else<\/span> <span class=\"hljs-keyword\">if<\/span> (c == <span class=\"hljs-string\">')'<\/span>) {\r\n                <span class=\"hljs-keyword\">while<\/span> (!operatorStack.isEmpty() &amp;&amp; operatorStack.peek() != <span class=\"hljs-string\">'('<\/span>) {\r\n                    <span class=\"hljs-type\">char<\/span> <span class=\"hljs-variable\">operator<\/span> <span class=\"hljs-operator\">=<\/span> operatorStack.pop();\r\n                    <span class=\"hljs-type\">double<\/span> <span class=\"hljs-variable\">operand2<\/span> <span class=\"hljs-operator\">=<\/span> numberStack.pop();\r\n                    <span class=\"hljs-type\">double<\/span> <span class=\"hljs-variable\">operand1<\/span> <span class=\"hljs-operator\">=<\/span> numberStack.pop();\r\n                    <span class=\"hljs-type\">double<\/span> <span class=\"hljs-variable\">result<\/span> <span class=\"hljs-operator\">=<\/span> applyOperator(operator, operand1, operand2);\r\n                    numberStack.push(result);\r\n                }\r\n                operatorStack.pop();  <span class=\"hljs-comment\">\/\/ \u5f39\u51fa\u5de6\u62ec\u53f7<\/span>\r\n            } <span class=\"hljs-keyword\">else<\/span> <span class=\"hljs-keyword\">if<\/span> (isOperator(c)) {\r\n                <span class=\"hljs-keyword\">while<\/span> (!operatorStack.isEmpty() &amp;&amp; operatorStack.peek() != <span class=\"hljs-string\">'('<\/span> &amp;&amp; getPrecedence(c) &lt;= getPrecedence(operatorStack.peek())) {\r\n                    <span class=\"hljs-type\">char<\/span> <span class=\"hljs-variable\">operator<\/span> <span class=\"hljs-operator\">=<\/span> operatorStack.pop();\r\n                    <span class=\"hljs-type\">double<\/span> <span class=\"hljs-variable\">operand2<\/span> <span class=\"hljs-operator\">=<\/span> numberStack.pop();\r\n                    <span class=\"hljs-type\">double<\/span> <span class=\"hljs-variable\">operand1<\/span> <span class=\"hljs-operator\">=<\/span> numberStack.pop();\r\n                    <span class=\"hljs-type\">double<\/span> <span class=\"hljs-variable\">result<\/span> <span class=\"hljs-operator\">=<\/span> applyOperator(operator, operand1, operand2);\r\n                    numberStack.push(result);\r\n                }\r\n                operatorStack.push(c);\r\n            }\r\n        }\r\n\r\n        <span class=\"hljs-keyword\">while<\/span> (!operatorStack.isEmpty()) {\r\n            <span class=\"hljs-type\">char<\/span> <span class=\"hljs-variable\">operator<\/span> <span class=\"hljs-operator\">=<\/span> operatorStack.pop();\r\n            <span class=\"hljs-type\">double<\/span> <span class=\"hljs-variable\">operand2<\/span> <span class=\"hljs-operator\">=<\/span> numberStack.pop();\r\n            <span class=\"hljs-type\">double<\/span> <span class=\"hljs-variable\">operand1<\/span> <span class=\"hljs-operator\">=<\/span> numberStack.pop();\r\n            <span class=\"hljs-type\">double<\/span> <span class=\"hljs-variable\">result<\/span> <span class=\"hljs-operator\">=<\/span> applyOperator(operator, operand1, operand2);\r\n            numberStack.push(result);\r\n        }\r\n\r\n        <span class=\"hljs-keyword\">return<\/span> numberStack.pop();\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">boolean<\/span> <span class=\"hljs-title function_\">isOperator<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">char<\/span> c)<\/span> {\r\n        <span class=\"hljs-keyword\">return<\/span> c == <span class=\"hljs-string\">'+'<\/span> || c == <span class=\"hljs-string\">'-'<\/span> || c == <span class=\"hljs-string\">'*'<\/span> || c == <span class=\"hljs-string\">'\/'<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">getPrecedence<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">char<\/span> operator)<\/span> {\r\n        <span class=\"hljs-keyword\">if<\/span> (operator == <span class=\"hljs-string\">'+'<\/span> || operator == <span class=\"hljs-string\">'-'<\/span>) {\r\n            <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n        } <span class=\"hljs-keyword\">else<\/span> <span class=\"hljs-keyword\">if<\/span> (operator == <span class=\"hljs-string\">'*'<\/span> || operator == <span class=\"hljs-string\">'\/'<\/span>) {\r\n            <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">2<\/span>;\r\n        } <span class=\"hljs-keyword\">else<\/span> {\r\n            <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n        }\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">double<\/span> <span class=\"hljs-title function_\">applyOperator<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">char<\/span> operator, <span class=\"hljs-type\">double<\/span> operand1, <span class=\"hljs-type\">double<\/span> operand2)<\/span> {\r\n        <span class=\"hljs-keyword\">switch<\/span> (operator) {\r\n            <span class=\"hljs-keyword\">case<\/span> <span class=\"hljs-string\">'+'<\/span>: <span class=\"hljs-keyword\">return<\/span> operand1 + operand2;\r\n            <span class=\"hljs-keyword\">case<\/span> <span class=\"hljs-string\">'-'<\/span>: <span class=\"hljs-keyword\">return<\/span> operand1 - operand2;\r\n            <span class=\"hljs-keyword\">case<\/span> <span class=\"hljs-string\">'*'<\/span>: <span class=\"hljs-keyword\">return<\/span> operand1 * operand2;\r\n            <span class=\"hljs-keyword\">case<\/span> <span class=\"hljs-string\">'\/'<\/span>: <span class=\"hljs-keyword\">return<\/span> operand<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u30b9\u30bf\u30c3\u30af\u3092\u4f7f\u7528\u3057\u3066\u7b97\u8853\u5f0f\u3092\u8a55\u4fa1\u3067\u304d\u307e\u3059\u3002\u624b\u9806\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002 \u6f14\u7b97\u5b50\u3092\u5165\u308c\u308b\u6f14\u7b97\u5b50\u30b9\u30bf\u30c3\u30af\u3068\u3001\u6570\u5024\u3092\u5165\u308c\u308b\u6570\u5024\u30b9\u30bf\u30c3\u30af\u30922\u3064\u7528\u610f\u3057\u307e\u3059\u3002 \u30b9\u30da\u30fc\u30b9\u6587\u5b57\u306f\u7121\u8996\u3057\u307e\u3059\u3002 \u6570\u5b57\u3060\u3063\u305f\u3089\u6570\u5024\u306b\u5909\u63db\u3057\u3001numberStack\u306b\u30d7 [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-115988","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"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>Java\u3067\u306e\u7b97\u8853\u5f0f\u306e\u8a55\u4fa1\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\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\/ja\/blog\/java\u3067\u306e\u7b97\u8853\u5f0f\u306e\u8a55\u4fa1\u65b9\u6cd5\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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