{"id":20679,"date":"2024-03-16T14:53:10","date_gmt":"2024-03-16T05:53:10","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%82%a6%e3%82%a3%e3%83%b3%e3%83%89%e3%82%a6%e4%bb%98%e3%81%8d%e3%81%ae%e3%82%ab%e3%83%ac%e3%83%b3%e3%83%80%e3%83%bc%e3%82%92%e4%bd%9c%e6%88%90\/"},"modified":"2025-08-07T02:58:10","modified_gmt":"2025-08-06T17:58:10","slug":"java%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%82%a6%e3%82%a3%e3%83%b3%e3%83%89%e3%82%a6%e4%bb%98%e3%81%8d%e3%81%ae%e3%82%ab%e3%83%ac%e3%83%b3%e3%83%80%e3%83%bc%e3%82%92%e4%bd%9c%e6%88%90","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%82%a6%e3%82%a3%e3%83%b3%e3%83%89%e3%82%a6%e4%bb%98%e3%81%8d%e3%81%ae%e3%82%ab%e3%83%ac%e3%83%b3%e3%83%80%e3%83%bc%e3%82%92%e4%bd%9c%e6%88%90\/","title":{"rendered":"Java\u3092\u4f7f\u7528\u3057\u3066\u30a6\u30a3\u30f3\u30c9\u30a6\u4ed8\u304d\u306e\u30ab\u30ec\u30f3\u30c0\u30fc\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\u306f\uff1f"},"content":{"rendered":"<p>Java\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a9\u30fc\u30e0\u4ed8\u304d\u306e\u30ab\u30ec\u30f3\u30c0\u30fc\u3092\u4f5c\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u7a93\u3084\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306bJava\u306eSwing\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\u4ee3\u7801\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528Java\u7f16\u5199\u5e26\u6709\u7a97\u4f53\u7684\u65e5\u5386\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.ActionEvent;\r\n<span class=\"hljs-keyword\">import<\/span> java.awt.event.ActionListener;\r\n<span class=\"hljs-keyword\">import<\/span> java.time.LocalDate;\r\n<span class=\"hljs-keyword\">import<\/span> java.time.YearMonth;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">CalendarApp<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">JFrame<\/span> {\r\n    <span class=\"hljs-keyword\">private<\/span> YearMonth currentYearMonth;\r\n    <span class=\"hljs-keyword\">private<\/span> JLabel monthLabel;\r\n    <span class=\"hljs-keyword\">private<\/span> JButton prevButton;\r\n    <span class=\"hljs-keyword\">private<\/span> JButton nextButton;\r\n    <span class=\"hljs-keyword\">private<\/span> JTable calendarTable;\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title function_\">CalendarApp<\/span><span class=\"hljs-params\">()<\/span> {\r\n        currentYearMonth = YearMonth.now();\r\n\r\n        setTitle(<span class=\"hljs-string\">\"Calendar App\"<\/span>);\r\n        setSize(<span class=\"hljs-number\">400<\/span>, <span class=\"hljs-number\">300<\/span>);\r\n        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);\r\n        setLocationRelativeTo(<span class=\"hljs-literal\">null<\/span>);\r\n\r\n        monthLabel = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">JLabel<\/span>(<span class=\"hljs-string\">\"\"<\/span>, JLabel.CENTER);\r\n        calendarTable = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">JTable<\/span>(<span class=\"hljs-number\">6<\/span>, <span class=\"hljs-number\">7<\/span>);\r\n\r\n        prevButton = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">JButton<\/span>(<span class=\"hljs-string\">\"Prev\"<\/span>);\r\n        prevButton.addActionListener(<span class=\"hljs-keyword\">new<\/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                currentYearMonth = currentYearMonth.minusMonths(<span class=\"hljs-number\">1<\/span>);\r\n                updateCalendar();\r\n            }\r\n        });\r\n\r\n        nextButton = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">JButton<\/span>(<span class=\"hljs-string\">\"Next\"<\/span>);\r\n        nextButton.addActionListener(<span class=\"hljs-keyword\">new<\/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                currentYearMonth = currentYearMonth.plusMonths(<span class=\"hljs-number\">1<\/span>);\r\n                updateCalendar();\r\n            }\r\n        });\r\n\r\n        updateCalendar();\r\n\r\n        setLayout(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">BorderLayout<\/span>());\r\n        add(monthLabel, BorderLayout.NORTH);\r\n        add(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">JScrollPane<\/span>(calendarTable), BorderLayout.CENTER);\r\n\r\n        <span class=\"hljs-type\">JPanel<\/span> <span class=\"hljs-variable\">buttonPanel<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">JPanel<\/span>();\r\n        buttonPanel.add(prevButton);\r\n        buttonPanel.add(nextButton);\r\n        add(buttonPanel, BorderLayout.SOUTH);\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">updateCalendar<\/span><span class=\"hljs-params\">()<\/span> {\r\n        monthLabel.setText(currentYearMonth.getYear() + <span class=\"hljs-string\">\"\u5e74\"<\/span> + currentYearMonth.getMonthValue() + <span class=\"hljs-string\">\"\u6708\"<\/span>);\r\n\r\n        <span class=\"hljs-type\">LocalDate<\/span> <span class=\"hljs-variable\">firstDayOfMonth<\/span> <span class=\"hljs-operator\">=<\/span> currentYearMonth.atDay(<span class=\"hljs-number\">1<\/span>);\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">firstDayOfWeek<\/span> <span class=\"hljs-operator\">=<\/span> firstDayOfMonth.getDayOfWeek().getValue();\r\n\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">daysInMonth<\/span> <span class=\"hljs-operator\">=<\/span> currentYearMonth.lengthOfMonth();\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">numRows<\/span> <span class=\"hljs-operator\">=<\/span> (<span class=\"hljs-type\">int<\/span>) Math.ceil((firstDayOfWeek + daysInMonth) \/ <span class=\"hljs-number\">7.0<\/span>);\r\n\r\n        String[] columnNames = {<span class=\"hljs-string\">\"\u5468\u65e5\"<\/span>, <span class=\"hljs-string\">\"\u5468\u4e00\"<\/span>, <span class=\"hljs-string\">\"\u5468\u4e8c\"<\/span>, <span class=\"hljs-string\">\"\u5468\u4e09\"<\/span>, <span class=\"hljs-string\">\"\u5468\u56db\"<\/span>, <span class=\"hljs-string\">\"\u5468\u4e94\"<\/span>, <span class=\"hljs-string\">\"\u5468\u516d\"<\/span>};\r\n        Object[][] data = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Object<\/span>[numRows][<span class=\"hljs-number\">7<\/span>];\r\n\r\n        <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">day<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">1<\/span> - firstDayOfWeek;\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; numRows; i++) {\r\n            <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">j<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">0<\/span>; j &lt; <span class=\"hljs-number\">7<\/span>; j++) {\r\n                <span class=\"hljs-keyword\">if<\/span> (day &gt; <span class=\"hljs-number\">0<\/span> &amp;&amp; day &lt;= daysInMonth) {\r\n                    data[i][j] = day;\r\n                } <span class=\"hljs-keyword\">else<\/span> {\r\n                    data[i][j] = <span class=\"hljs-string\">\"\"<\/span>;\r\n                }\r\n                day++;\r\n            }\r\n        }\r\n\r\n        calendarTable.setModel(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">javax<\/span>.swing.table.DefaultTableModel(data, columnNames));\r\n        calendarTable.setDefaultRenderer(calendarTable.getColumnClass(<span class=\"hljs-number\">0<\/span>), <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">CalendarCellRenderer<\/span>());\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">CalendarCellRenderer<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">DefaultTableCellRenderer<\/span> {\r\n        <span class=\"hljs-meta\">@Override<\/span>\r\n        <span class=\"hljs-keyword\">public<\/span> Component <span class=\"hljs-title function_\">getTableCellRendererComponent<\/span><span class=\"hljs-params\">(JTable table, Object value, <span class=\"hljs-type\">boolean<\/span> isSelected, <span class=\"hljs-type\">boolean<\/span> hasFocus, <span class=\"hljs-type\">int<\/span> row, <span class=\"hljs-type\">int<\/span> column)<\/span> {\r\n            <span class=\"hljs-type\">JLabel<\/span> <span class=\"hljs-variable\">label<\/span> <span class=\"hljs-operator\">=<\/span> (JLabel) <span class=\"hljs-built_in\">super<\/span>.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);\r\n            <span class=\"hljs-keyword\">if<\/span> (value != <span class=\"hljs-literal\">null<\/span>) {\r\n                <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">day<\/span> <span class=\"hljs-operator\">=<\/span> (<span class=\"hljs-type\">int<\/span>) value;\r\n                <span class=\"hljs-keyword\">if<\/span> (day == LocalDate.now().getDayOfMonth() &amp;&amp; currentYearMonth.equals(YearMonth.now())) {\r\n                    label.setForeground(Color.RED);\r\n                } <span class=\"hljs-keyword\">else<\/span> {\r\n                    label.setForeground(table.getForeground());\r\n                }\r\n            }\r\n            <span class=\"hljs-keyword\">return<\/span> label;\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(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Runnable<\/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_\">run<\/span><span class=\"hljs-params\">()<\/span> {\r\n                <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">CalendarApp<\/span>().setVisible(<span class=\"hljs-literal\">true<\/span>);\r\n            }\r\n        });\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u3001\u30a6\u30a3\u30f3\u30c9\u30a6\u3092\u6301\u3064\u30ab\u30ec\u30f3\u30c0\u30fc\u30a2\u30d7\u30ea\u3092\u4f5c\u6210\u3057\u3066\u304a\u308a\u3001Prev\u30dc\u30bf\u30f3\u3068Next\u30dc\u30bf\u30f3\u3067\u6708\u3092\u5207\u308a\u66ff\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30ab\u30ec\u30f3\u30c0\u30fc\u30c6\u30fc\u30d6\u30eb\u3067\u306f\u3001\u73fe\u5728\u306e\u65e5\u4ed8\u304c\u8d64\u8272\u3067\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001Swing\u306eJFrame\u3001JLabel\u3001JButton\u3001JTable\u306a\u3069\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3001\u30a6\u30a3\u30f3\u30c9\u30a6\u3068\u30ab\u30ec\u30f3\u30c0\u30fc\u30c6\u30fc\u30d6\u30eb\u3092\u69cb\u7bc9\u3057\u307e\u3057\u305f\u3002updateCalendar()\u30e1\u30bd\u30c3\u30c9\u306f\u30ab\u30ec\u30f3\u30c0\u30fc\u30c6\u30fc\u30d6\u30eb\u306e\u5185\u5bb9\u3092\u66f4\u65b0\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002CalendarCellRenderer\u30af\u30e9\u30b9\u306f\u30bb\u30eb\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u3001\u73fe\u5728\u306e\u65e5\u4ed8\u3092\u5f37\u8abf\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n<p>main()\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u30ab\u30ec\u30f3\u30c0\u30fc\u30a2\u30d7\u30ea\u304c\u8d77\u52d5\u3057\u3066\u30a6\u30a3\u30f3\u30c9\u30a6\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a9\u30fc\u30e0\u4ed8\u304d\u306e\u30ab\u30ec\u30f3\u30c0\u30fc\u3092\u4f5c\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u7a93\u3084\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306bJava\u306eSwing\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 \u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\u4ee3\u7801\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528Java\u7f16\u5199\u5e26\u6709\u7a97\u4f53 [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-20679","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\/ -->\n<title>Java\u3092\u4f7f\u7528\u3057\u3066\u30a6\u30a3\u30f3\u30c9\u30a6\u4ed8\u304d\u306e\u30ab\u30ec\u30f3\u30c0\u30fc\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\u306f\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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