{"id":23757,"date":"2015-06-17T11:00:05","date_gmt":"2015-06-17T08:00:05","guid":{"rendered":"http:\/\/examples.javacodegeeks.com\/?p=23757"},"modified":"2015-06-16T01:10:50","modified_gmt":"2015-06-15T22:10:50","slug":"java-jtable-example","status":"publish","type":"post","link":"https:\/\/examples.javacodegeeks.com\/java-development\/desktop-java\/swing\/jtable\/java-jtable-example\/","title":{"rendered":"Java JTable Example"},"content":{"rendered":"

In this example we are going to demonstrate how to use Java Swing JTable<\/a><\/code>,\u00a0JTable<\/a><\/code> is a Swing component with which we can display tables of data, optionally allowing the user to edit the data,\u00a0JTable<\/a><\/code> relies on a separate TableModel<\/a><\/code> object to hold and represent the data it displays.
\nThis article shows how to work with\u00a0JTable<\/a><\/code> using a simple example where we build a GUI with a\u00a0JTable<\/a><\/code> to show contents of a directory in the filesystem in tabular form.<\/p>\n

 <\/p>\n

1. Swing JTable:<\/h2>\n

We create a new\u00a0JTable<\/a><\/code>\u00a0object where we can initialize the data model and enable scrolling.<\/p>\n

\r\n\/\/ Create a JTable and tell it to display our model\r\nJTable table = new JTable(tableModel);\r\n\r\n\/\/ Put the JTable in a JScrollPane to handle scrolling\r\nJScrollPane tableScrollPane = new JScrollPane(table);\r\ntableScrollPane.setPreferredSize(new Dimension(250, 200));\r\n<\/pre>\n
2. JTable Data Model:<\/h2>\n
We create a CustomTableModel.java<\/code> as we want to display a tabular view of data that is not, by nature, tabular, you must implement the\u00a0TableModel<\/a><\/code> interface (or, more likely, subclass the AbstractTableModel<\/a><\/code> class). The job of this\u00a0TableModel<\/a><\/code> implementation is to serve as the interface between your data, which is not neatly organized into a table, and the\u00a0JTable<\/a><\/code> object, which wants to display a table. In other words, your\u00a0TableModel<\/a><\/code> presents a neat tabular view of your data, regardless of how the data is organized underneath.<\/p>\n
CustomTableModel.java:<\/span><\/em><\/p>\n
package com.jcg;\r\n\r\nimport java.io.File;\r\nimport java.util.Date;\r\n\r\nimport javax.swing.table.AbstractTableModel;\r\n\r\n\/**\r\n * The Class CustomTableModel contains methods to allow the JTable component to\r\n * get and display data about the files in a specified directory. It represents\r\n * a table with six columns: filename, size, modification date, plus three\r\n * columns for flags: directory, readable, writable.\r\n * \r\n * @author ashraf_sarhan\r\n *\/\r\n@SuppressWarnings(\"serial\")\r\npublic class CustomTableModel extends AbstractTableModel {\r\n\r\n\tprivate File dir;\r\n\tprivate String[] filenames;\r\n\tprivate String[] columnNames = TableColumn.getNames();\r\n\tprivate Class<?>[] columnClasses = Constants.COLUMN_CLASSES;\r\n\r\n\t\/\/ This table model works for any one given directory\r\n\tpublic CustomTableModel(File dir) {\r\n\t\tthis.dir = dir;\r\n\t\t\/\/ Store a list of files in the directory\r\n\t\tthis.filenames = dir.list();\r\n\t}\r\n\r\n\t\/\/ Returns a constant columns number for this model\r\n\tpublic int getColumnCount() {\r\n\t\treturn Constants.COLUMN_CLASSES.length;\r\n\t}\r\n\r\n\t\/\/ Returns the number of files in directory\r\n\tpublic int getRowCount() {\r\n\t\treturn filenames.length;\r\n\t}\r\n\r\n\t\/\/ Returns the name of the given column index\r\n\tpublic String getColumnName(int col) {\r\n\t\treturn columnNames[col];\r\n\t}\r\n\r\n\tpublic Class<?> getColumnClass(int col) {\r\n\t\treturn columnClasses[col];\r\n\t}\r\n\r\n\t\/\/ Returns the value of each cell\r\n\tpublic Object getValueAt(int row, int col) {\r\n\t\tFile f = new File(dir, filenames[row]);\r\n\t\tTableColumn tableColumn = TableColumn.fromIndex(col);\r\n\t\tswitch (tableColumn) {\r\n\t\tcase NAME:\r\n\t\t\treturn filenames[row];\r\n\t\tcase SIZE:\r\n\t\t\treturn new Long(f.length());\r\n\t\tcase LAST_MODIFIED:\r\n\t\t\treturn new Date(f.lastModified());\r\n\t\tcase DIRECTORY:\r\n\t\t\treturn f.isDirectory() ? Boolean.TRUE : Boolean.FALSE;\r\n\t\tcase READABLE:\r\n\t\t\treturn f.canRead() ? Boolean.TRUE : Boolean.FALSE;\r\n\t\tcase WRITABLE:\r\n\t\t\treturn f.canWrite() ? Boolean.TRUE : Boolean.FALSE;\r\n\t\tdefault:\r\n\t\t\treturn null;\r\n\t\t}\r\n\t}\r\n\r\n}\r\n<\/pre>\n
Also, we have an enum TableColumn.java<\/code> which represents the table six columns (filename<\/code>, size<\/code>, modification date<\/code>, directory<\/code>, readable<\/code>, writable<\/code>).
 
<\/div> <\/div><\/p>\n
TableColumn.java:<\/em><\/span><\/p>\n
package com.jcg;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.HashMap;\r\nimport java.util.List;\r\nimport java.util.Map;\r\n\r\n\/**\r\n * The Enum TableColumn contains table columns names along with their indices.\r\n *\r\n * @author ashraf_sarhan\r\n *\/\r\npublic enum TableColumn {\r\n\r\n\tNAME(0, \"name\"), SIZE(1, \"size\"), LAST_MODIFIED(2, \"last modified\"), DIRECTORY(\r\n\t\t\t3, \"directory?\"), READABLE(4, \"readable?\"), WRITABLE(5, \"writable?\");\r\n\r\n\tprivate TableColumn(int index, String name) {\r\n\t\tthis.index = index;\r\n\t\tthis.name = name;\r\n\t}\r\n\r\n\tprivate int index;\r\n\tprivate String name;\r\n\r\n\tprivate static final Map<Integer, TableColumn> COLUMN_INDEX_NAME_MAP = new HashMap<>();\r\n\tprivate static final List<String> NAMES = new ArrayList<>();\r\n\r\n\tstatic {\r\n\t\tfor (TableColumn c : TableColumn.values()) {\r\n\t\t\tCOLUMN_INDEX_NAME_MAP.put(c.index, c);\r\n\t\t\tNAMES.add(c.name);\r\n\t\t}\r\n\t}\r\n\r\n\tpublic static TableColumn fromIndex(int colIndex) {\r\n\t\tTableColumn columnName = COLUMN_INDEX_NAME_MAP.get(colIndex);\r\n\t\treturn (columnName != null) ? columnName : null;\r\n\t}\r\n\r\n\tpublic static String[] getNames() {\r\n\t\treturn NAMES.toArray(new String[NAMES.size()]);\r\n\t}\r\n\r\n}\r\n<\/pre>\n
3. JTable Demo:<\/h2>\n
We create SwingJTableDemo.java<\/code> class to test our example. Also, we add a supplementary Constants.java<\/code> class contains constants used through our code.<\/p>\n
SwingJTableDemo.java:<\/em><\/span><\/p>\n
package com.jcg;\r\n\r\nimport java.awt.Dimension;\r\nimport java.awt.event.ActionEvent;\r\nimport java.awt.event.ActionListener;\r\nimport java.io.File;\r\n\r\nimport javax.swing.JButton;\r\nimport javax.swing.JFrame;\r\nimport javax.swing.JOptionPane;\r\nimport javax.swing.JPanel;\r\nimport javax.swing.JScrollPane;\r\nimport javax.swing.JSplitPane;\r\nimport javax.swing.JTable;\r\nimport javax.swing.JTextField;\r\nimport javax.swing.SwingUtilities;\r\nimport javax.swing.UIManager;\r\nimport javax.swing.UIManager.LookAndFeelInfo;\r\n\r\n\/**\r\n * The Class SwingJTableDemo to show our running example.\r\n *\r\n * @author ashraf_sarhan\r\n *\/\r\npublic class SwingJTableDemo {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tSwingUtilities.invokeLater(new Runnable() {\r\n\t\t\tpublic void run() {\r\n\t\t\t\ttry {\r\n\t\t\t\t\t\/\/ Set Nimbus as L&F\r\n\t\t\t\t\tsetLookAndFeel(Constants.NIMBUS_LF);\r\n\t\t\t\t\tcreateAndShowGUI(args);\r\n\t\t\t\t} catch (Exception e) {\r\n\t\t\t\t\te.printStackTrace();\r\n\t\t\t\t}\r\n\t\t\t}\r\n\t\t});\r\n\t}\r\n\r\n\tpublic static void createAndShowGUI(String[] args) throws Exception {\r\n\t\t\/\/ Figure out what directory to display\r\n\t\tFile dir;\r\n\t\tif (args.length > 0)\r\n\t\t\tdir = new File(args[0]);\r\n\t\telse\r\n\t\t\tdir = new File(System.getProperty(\"user.home\"));\r\n\r\n\t\t\/\/ Create a TableModel object to represent the contents of the directory\r\n\t\tCustomTableModel tableModel = new CustomTableModel(dir);\r\n\r\n\t\t\/\/ Create a JTable and tell it to display our model\r\n\t\tJTable table = new JTable(tableModel);\r\n\r\n\t\t\/\/ Put the JTable in a JScrollPane to handle scrolling\r\n\t\tJScrollPane tableScrollPane = new JScrollPane(table);\r\n\t\ttableScrollPane.setPreferredSize(new Dimension(250, 200));\r\n\r\n\t\tJTextField dirPathTextField = new JTextField(26);\r\n\r\n\t\t\/\/ Create an action listener to display the given directory\r\n\t\tJButton displayDirButton = new JButton(\"Display Directory\");\r\n\t\tdisplayDirButton.addActionListener(new ActionListener() {\r\n\t\t\tpublic void actionPerformed(ActionEvent e) {\r\n\t\t\t\tString dirPath = dirPathTextField.getText();\r\n\t\t\t\tif (dirPath != null && !\"\".equals(dirPath)) {\r\n\t\t\t\t\tFile newDir = new File(dirPath);\r\n\t\t\t\t\t;\r\n\t\t\t\t\tCustomTableModel newTableModel = new CustomTableModel(\r\n\t\t\t\t\t\t\tnewDir);\r\n\t\t\t\t\ttable.setModel(newTableModel);\r\n\t\t\t\t} else {\r\n\t\t\t\t\tJOptionPane.showMessageDialog(null,\r\n\t\t\t\t\t\t\t\"Directory path is empty\", \"Error\",\r\n\t\t\t\t\t\t\tJOptionPane.ERROR_MESSAGE);\r\n\t\t\t\t}\r\n\t\t\t}\r\n\t\t});\r\n\r\n\t\tJPanel ctrlPane = new JPanel();\r\n\t\tctrlPane.add(dirPathTextField);\r\n\t\tctrlPane.add(displayDirButton);\r\n\r\n\t\tJSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT,\r\n\t\t\t\tctrlPane, tableScrollPane);\r\n\t\tsplitPane.setDividerLocation(35);\r\n\t\tsplitPane.setEnabled(false);\r\n\r\n\t\t\/\/ Display it all in a scrolling window and make the window appear\r\n\t\tJFrame frame = new JFrame(\"Swing JTable Demo\");\r\n\t\tframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);\r\n\t\tframe.add(splitPane);\r\n\t\tframe.pack();\r\n\t\tframe.setLocationRelativeTo(null);\r\n\t\tframe.setVisible(true);\r\n\t}\r\n\r\n\tpublic static void setLookAndFeel(String lf) throws Exception {\r\n\t\ttry {\r\n\t\t\tfor (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {\r\n\t\t\t\tif (lf.equals(info.getName())) {\r\n\t\t\t\t\tUIManager.setLookAndFeel(info.getClassName());\r\n\t\t\t\t\tbreak;\r\n\t\t\t\t}\r\n\t\t\t}\r\n\t\t} catch (Exception e) {\r\n\t\t\t\/\/ If the given lf is not available, you can set the GUI the system\r\n\t\t\t\/\/ default L&F.\r\n\t\t\tUIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());\r\n\t\t}\r\n\t}\r\n\r\n}\r\n<\/pre>\n
Constants.java:<\/span><\/em><\/p>\n
package com.jcg;\r\n\r\nimport java.util.Date;\r\n\r\n\/**\r\n * The Class Constants contains some constants which will be used across the\r\n * code.\r\n *\r\n * @author ashraf_sarhan\r\n *\/\r\npublic class Constants {\r\n\r\n\tpublic static final Class<?>[] COLUMN_CLASSES = new Class[] { String.class,\r\n\t\t\tLong.class, Date.class, Boolean.class, Boolean.class, Boolean.class };\r\n\r\n\tpublic static final String NIMBUS_LF = \"Nimbus\";\r\n\r\n}\r\n<\/pre>\n
Output:<\/em><\/span><\/p>\n
\"Figure<\/a>
Figure 1: Swing JTable Demo<\/figcaption><\/figure><\/p>\n
4. Download the Source Code of this example:<\/h2>\n
This was an example on how to use Java Swing\u00a0JTable<\/a><\/code>.<\/p>\n
Download<\/strong>
\nYou can download the full source code of this example here: SwingJTableExampleCode.zip<\/strong><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"
In this example we are going to demonstrate how to use Java Swing JTable,\u00a0JTable is a Swing component with which we can display tables of data, optionally allowing the user to edit the data,\u00a0JTable relies on a separate TableModel object to hold and represent the data it displays. This article shows how to work with\u00a0JTable …<\/p>\n","protected":false},"author":24,"featured_media":1204,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[954],"tags":[1058],"class_list":["post-23757","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-jtable","tag-swing"],"yoast_head":"\nJava JTable Example - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"In this example we are going to demonstrate how to use Java Swing JTable,\u00a0JTable is a Swing component with which we can display tables of data, optionally\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/examples.javacodegeeks.com\/java-development\/desktop-java\/swing\/jtable\/java-jtable-example\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java JTable Example - 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