{"id":20387,"date":"2022-11-09T13:50:46","date_gmt":"2022-11-09T08:20:46","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-set-color-of-jtable-row-at-runtime\/"},"modified":"2022-11-09T13:50:46","modified_gmt":"2022-11-09T08:20:46","slug":"solved-set-color-of-jtable-row-at-runtime","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-set-color-of-jtable-row-at-runtime\/","title":{"rendered":"[Solved] Set color of JTable row at runtime"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-57995348\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"57995348\" data-parentid=\"57993177\" data-score=\"2\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<pre><code>table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() {\n    @Override\n    public Component getTableCellRendererComponent(JTable table,\n                                  Object value,\n                                  boolean isSelected,\n                                  boolean hasFocus,\n                                  int row,\n                                  int column) {\n        Component comp = super.getTableCellRendererComponent(table,\n                value, isSelected, hasFocus, row, column);\n        if(!isSelected) { \/\/Important check, see comment below!\n            boolean levelBreak = row == 0;\n            if (!levelBreak) {\n                Object prior = table.getValueAt(row - 1, 0);\n                Object current = table.getValueAt(row, 0);\n                levelBreak = !prior.equals(current);\n            }\n            comp.setBackground(levelBreak ? Color.BLUE : Color.WHITE);\n        }\n        return comp;\n    }\n});\n<\/code><\/pre>\n<p>As the renderer \/ renderer component is reused for all table cells, the background must be set for all cases.<\/p>\n<p>In general the JTable&#8217;s TabelModel is better for getting a value instead of JTable&#8217;s getValueAt, but evidently you neither sort the rows nor rearrange the columns.<\/p>\n<hr>\n<p><strong><em>For a possible older installed renderer<\/em><\/strong><\/p>\n<pre><code>class MyCellRenderer extends DefaultTableCellRenderer {\n\n    private final TableCellRenderer old;\n\n    MyCellRenderer(TableCellRenderer old) {\n        this.old = old;\n    }\n\n    @Override\n    public Component getTableCellRendererComponent(JTable table,\n                                  Object value,\n                                  boolean isSelected,\n                                  boolean hasFocus,\n                                  int row,\n                                  int column) {\n        boolean levelBreak = row == 0;\n        if (!levelBreak) {\n            Object prior = table.getValueAt(row - 1, 0);\n            Object current = table.getValueAt(row, 0);\n            levelBreak = !prior.equals(current);\n        }\n        Component comp;\n        if (old != null) {\n            comp = old.getTableCellRendererComponent(table,\n                value, isSelected, hasFocus, row, column);\n        } else {\n            comp = super.getTableCellRendererComponent(table,\n                value, isSelected, hasFocus, row, column);\n        }\n        comp.setBackground(levelBreak ? Color.BLUE : Color.WHITE);\n        return comp;\n    }\n}\n\ntable.setDefaultRenderer(Object.class, new MyCellRenderer(table.getDefaultRenderer(Object.class));\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">10<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Set color of JTable row at runtime <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() { @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { Component comp = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); if(!isSelected) { \/\/Important check, see comment below! boolean levelBreak = row == 0; if (!levelBreak) { Object prior = table.getValueAt(row &#8211; 1, 0); Object current &#8230; <a title=\"[Solved] Set color of JTable row at runtime\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-set-color-of-jtable-row-at-runtime\/\" aria-label=\"More on [Solved] Set color of JTable row at runtime\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[323,3351,621],"class_list":["post-20387","post","type-post","status-publish","format-standard","hentry","category-solved","tag-java","tag-jtable","tag-swing"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Set color of JTable row at runtime - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-set-color-of-jtable-row-at-runtime\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Set color of JTable row at runtime - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() { @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { Component comp = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); if(!isSelected) { \/\/Important check, see comment below! boolean levelBreak = row == 0; if (!levelBreak) { Object prior = table.getValueAt(row - 1, 0); Object current ... 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