{"id":80491,"date":"2024-03-20T22:42:03","date_gmt":"2024-03-20T13:42:03","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%83%a1%e3%83%a2%e5%b8%b3%e3%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%a0%e3%82%92%e6%9b%b8%e3%81%8f%e3%81%ab%e3%81%af%ef%bc%9f\/"},"modified":"2025-08-12T12:02:56","modified_gmt":"2025-08-12T03:02:56","slug":"java%e3%81%a7%e3%83%a1%e3%83%a2%e5%b8%b3%e3%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%a0%e3%82%92%e6%9b%b8%e3%81%8f%e3%81%ab%e3%81%af%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%83%a1%e3%83%a2%e5%b8%b3%e3%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%a0%e3%82%92%e6%9b%b8%e3%81%8f%e3%81%ab%e3%81%af%ef%bc%9f\/","title":{"rendered":"Java\u3067\u30e1\u30e2\u5e33\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u304f\u306b\u306f\uff1f"},"content":{"rendered":"<p>Java GUI\u30e9\u30a4\u30d6\u30e9\u30ea\uff08Swing\u3084JavaFX\u306a\u3069\uff09\u3092\u4f7f\u7528\u3057\u3066\u30e6\u30fc\u30b6\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u4f5c\u6210\u3057\u3001Java\u30d5\u30a1\u30a4\u30ebIO\u64cd\u4f5c\u3092\u4f7f\u7528\u3057\u3066\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u306e\u8aad\u307f\u66f8\u304d\u3092\u884c\u3046\u3001\u5358\u7d14\u306a\u30e1\u30e2\u5e33\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n<p>Swing \u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3057\u3066\u7c21\u5358\u306a\u30e1\u30e2\u5e33\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3059\u308b\u4f8b\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> javax.swing.*;\r\n<span class=\"hljs-keyword\">import<\/span> java.awt.*;\r\n<span class=\"hljs-keyword\">import<\/span> java.awt.event.*;\r\n<span class=\"hljs-keyword\">import<\/span> java.io.*;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">Notepad<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">JFrame<\/span> {\r\n\r\n    <span class=\"hljs-keyword\">private<\/span> JTextArea textArea;\r\n    <span class=\"hljs-keyword\">private<\/span> JFileChooser fileChooser;\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title function_\">Notepad<\/span><span class=\"hljs-params\">()<\/span> {\r\n        <span class=\"hljs-built_in\">super<\/span>(<span class=\"hljs-string\">\"\u8bb0\u4e8b\u672c\"<\/span>);\r\n        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);\r\n        setSize(<span class=\"hljs-number\">800<\/span>, <span class=\"hljs-number\">600<\/span>);\r\n\r\n        textArea = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">JTextArea<\/span>();\r\n        <span class=\"hljs-type\">JScrollPane<\/span> <span class=\"hljs-variable\">scrollPane<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">JScrollPane<\/span>(textArea);\r\n        add(scrollPane, BorderLayout.CENTER);\r\n\r\n        fileChooser = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">JFileChooser<\/span>();\r\n\r\n        <span class=\"hljs-type\">JMenuBar<\/span> <span class=\"hljs-variable\">menuBar<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">JMenuBar<\/span>();\r\n        <span class=\"hljs-type\">JMenu<\/span> <span class=\"hljs-variable\">fileMenu<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">JMenu<\/span>(<span class=\"hljs-string\">\"\u6587\u4ef6\"<\/span>);\r\n        <span class=\"hljs-type\">JMenuItem<\/span> <span class=\"hljs-variable\">newMenuItem<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">JMenuItem<\/span>(<span class=\"hljs-string\">\"\u65b0\u5efa\"<\/span>);\r\n        <span class=\"hljs-type\">JMenuItem<\/span> <span class=\"hljs-variable\">openMenuItem<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">JMenuItem<\/span>(<span class=\"hljs-string\">\"\u6253\u5f00\"<\/span>);\r\n        <span class=\"hljs-type\">JMenuItem<\/span> <span class=\"hljs-variable\">saveMenuItem<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">JMenuItem<\/span>(<span class=\"hljs-string\">\"\u4fdd\u5b58\"<\/span>);\r\n        <span class=\"hljs-type\">JMenuItem<\/span> <span class=\"hljs-variable\">exitMenuItem<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">JMenuItem<\/span>(<span class=\"hljs-string\">\"\u9000\u51fa\"<\/span>);\r\n\r\n        newMenuItem.addActionListener(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">NewActionListener<\/span>());\r\n        openMenuItem.addActionListener(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">OpenActionListener<\/span>());\r\n        saveMenuItem.addActionListener(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">SaveActionListener<\/span>());\r\n        exitMenuItem.addActionListener(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ExitActionListener<\/span>());\r\n\r\n        fileMenu.add(newMenuItem);\r\n        fileMenu.add(openMenuItem);\r\n        fileMenu.add(saveMenuItem);\r\n        fileMenu.add(exitMenuItem);\r\n\r\n        menuBar.add(fileMenu);\r\n        setJMenuBar(menuBar);\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">NewActionListener<\/span> <span class=\"hljs-keyword\">implements<\/span> <span class=\"hljs-title class_\">ActionListener<\/span> {\r\n        <span class=\"hljs-meta\">@Override<\/span>\r\n        <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">actionPerformed<\/span><span class=\"hljs-params\">(ActionEvent e)<\/span> {\r\n            textArea.setText(<span class=\"hljs-string\">\"\"<\/span>);\r\n        }\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">OpenActionListener<\/span> <span class=\"hljs-keyword\">implements<\/span> <span class=\"hljs-title class_\">ActionListener<\/span> {\r\n        <span class=\"hljs-meta\">@Override<\/span>\r\n        <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">actionPerformed<\/span><span class=\"hljs-params\">(ActionEvent e)<\/span> {\r\n            <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">returnVal<\/span> <span class=\"hljs-operator\">=<\/span> fileChooser.showOpenDialog(Notepad.<span class=\"hljs-built_in\">this<\/span>);\r\n            <span class=\"hljs-keyword\">if<\/span> (returnVal == JFileChooser.APPROVE_OPTION) {\r\n                <span class=\"hljs-type\">File<\/span> <span class=\"hljs-variable\">file<\/span> <span class=\"hljs-operator\">=<\/span> fileChooser.getSelectedFile();\r\n                <span class=\"hljs-keyword\">try<\/span> {\r\n                    <span class=\"hljs-type\">BufferedReader<\/span> <span class=\"hljs-variable\">reader<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">BufferedReader<\/span>(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">FileReader<\/span>(file));\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                    String line;\r\n                    <span class=\"hljs-keyword\">while<\/span> ((line = reader.readLine()) != <span class=\"hljs-literal\">null<\/span>) {\r\n                        sb.append(line).append(<span class=\"hljs-string\">\"\\n\"<\/span>);\r\n                    }\r\n                    reader.close();\r\n                    textArea.setText(sb.toString());\r\n                } <span class=\"hljs-keyword\">catch<\/span> (IOException ex) {\r\n                    ex.printStackTrace();\r\n                }\r\n            }\r\n        }\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">SaveActionListener<\/span> <span class=\"hljs-keyword\">implements<\/span> <span class=\"hljs-title class_\">ActionListener<\/span> {\r\n        <span class=\"hljs-meta\">@Override<\/span>\r\n        <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">actionPerformed<\/span><span class=\"hljs-params\">(ActionEvent e)<\/span> {\r\n            <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">returnVal<\/span> <span class=\"hljs-operator\">=<\/span> fileChooser.showSaveDialog(Notepad.<span class=\"hljs-built_in\">this<\/span>);\r\n            <span class=\"hljs-keyword\">if<\/span> (returnVal == JFileChooser.APPROVE_OPTION) {\r\n                <span class=\"hljs-type\">File<\/span> <span class=\"hljs-variable\">file<\/span> <span class=\"hljs-operator\">=<\/span> fileChooser.getSelectedFile();\r\n                <span class=\"hljs-keyword\">try<\/span> {\r\n                    <span class=\"hljs-type\">BufferedWriter<\/span> <span class=\"hljs-variable\">writer<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">BufferedWriter<\/span>(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">FileWriter<\/span>(file));\r\n                    writer.write(textArea.getText());\r\n                    writer.close();\r\n                } <span class=\"hljs-keyword\">catch<\/span> (IOException ex) {\r\n                    ex.printStackTrace();\r\n                }\r\n            }\r\n        }\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">ExitActionListener<\/span> <span class=\"hljs-keyword\">implements<\/span> <span class=\"hljs-title class_\">ActionListener<\/span> {\r\n        <span class=\"hljs-meta\">@Override<\/span>\r\n        <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">actionPerformed<\/span><span class=\"hljs-params\">(ActionEvent e)<\/span> {\r\n            System.exit(<span class=\"hljs-number\">0<\/span>);\r\n        }\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n        SwingUtilities.invokeLater(() -&gt; {\r\n            <span class=\"hljs-type\">Notepad<\/span> <span class=\"hljs-variable\">notepad<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Notepad<\/span>();\r\n            notepad.setVisible(<span class=\"hljs-literal\">true<\/span>);\r\n        });\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>JFrame \u3092\u4f7f\u7528\u3057\u3066\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3 \u30a6\u30a3\u30f3\u30c9\u30a6\u3092\u4f5c\u6210\u3057\u3001JTextArea \u3092\u8ffd\u52a0\u3057\u3066\u30c6\u30ad\u30b9\u30c8 \u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u8868\u793a\u3057\u307e\u3059\u3002\u30e1\u30cb\u30e5\u30fc \u30d0\u30fc\u304b\u3089\u3001\u65b0\u3057\u3044\u4f5c\u6210\u3001\u958b\u304f\u3001\u4fdd\u5b58\u3001\u7d42\u4e86\u306a\u3069\u306e\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u306e\u8aad\u307f\u66f8\u304d\u64cd\u4f5c\u306f\u3001\u30e1\u30cb\u30e5\u30fc\u30d0\u30fc\u306e\u958b\u304f\u30aa\u30d7\u30b7\u30e7\u30f3\u3068\u4fdd\u5b58\u30aa\u30d7\u30b7\u30e7\u30f3\u304b\u3089\u884c\u3048\u307e\u3059\u3002<\/p>\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306f\u30b7\u30f3\u30d7\u30eb\u306a\u30e1\u30e2\u5e33\u306e\u4f8b\u3067\u3059\u3002\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u3088\u308a\u591a\u304f\u306e\u6a5f\u80fd\u3084\u30b9\u30bf\u30a4\u30eb\u3092\u8ffd\u52a0\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java GUI\u30e9\u30a4\u30d6\u30e9\u30ea\uff08Swing\u3084JavaFX\u306a\u3069\uff09\u3092\u4f7f\u7528\u3057\u3066\u30e6\u30fc\u30b6\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u4f5c\u6210\u3057\u3001Java\u30d5\u30a1\u30a4\u30ebIO\u64cd\u4f5c\u3092\u4f7f\u7528\u3057\u3066\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u306e\u8aad\u307f\u66f8\u304d\u3092\u884c\u3046\u3001\u5358\u7d14\u306a\u30e1\u30e2\u5e33\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002 Swing  [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-80491","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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