Getting a JTable with a custom table model to show up in JScrollPane?
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JTable has several constructors that take a TableModel as a parameter. Is that what you're looking for? From the code snippet you supplied, it seems like you're calling the default constructor and expecting it to use your custom table model somehow.(Maybe there's some code missing that does this?).
If you use the default constructor JTable will internally create a DefaultTableModel instance and use that Edit: Comments don't take code very well, so adding here: To get the table to use your model, you would do something like this: MyTableModel model = new MyTableModel(); // ...initialise model if required JTable table = new JTable(model).
JTable has several constructors that take a TableModel as a parameter. Is that what you're looking for? From the code snippet you supplied, it seems like you're calling the default constructor and expecting it to use your custom table model somehow.(Maybe there's some code missing that does this?).
If you use the default constructor, JTable will internally create a DefaultTableModel instance and use that. Edit: Comments don't take code very well, so adding here: To get the table to use your model, you would do something like this: MyTableModel model = new MyTableModel(); // ...initialise model if required JTable table = new JTable(model).
I guess that is what I am confused on. The JTable info on the Sun web page states: There are two JTable constructors that directly accept data (SimpleTableDemo uses the first): JTable(Object rowData, Object columnNames) JTable(Vector rowData, Vector columnNames) It then states: The advantage of these constructors is that they are easy to use. However, these constructors also have disadvantages: They treat all data types the same (as strings).
– MarcZero Feb 14 '10 at 1:37 So reading on, I am under the impression that I have to create a custom class that extends AbstractTableModel and somehow a table I create will use that instead of the default constructor one. If I use the JTable(Object, Object) constructor, it does treat every cell as Strings, so I "assume" that calling the method without the constructor: JTable() will use the custom one I created, but my screen is now blank. I can go back to the default constructor and it shows up just fine, but I can't seem to get it to use my custom Table Model.
– MarcZero Feb 14 '10 at 1:37 @MarcZero: See edits in my answer. (If it doesn't make sense, maybe post some more of your code. I get this feeling that I might be missing something in what you're trying to do...) – Ash Feb 14 '10 at 2:02 That was it.
I can get the JTable to work show now, although getting it to render a checkbox is another mater entirely. I'll have to post another question. Thanks!
– MarcZero Feb 14 '10 at 2:59 trashgod's answer (stackoverflow. Com/questions/2259815/…) has info on the check box. – Ash Feb 14 '10 at 3:05.
As you observed, Ash is right on about passing your data model in the JTable constructor. If your model's getColumnClass() returns Boolean. Class, you'll get a check box renderer by default.
You might like this example that illustrates using a custom renderer and editor.
OK. After reviewing my code I realized that if I am leaving out any constructors, it will not find the link to your custom Table Model. So, if you created the class: class MyTableModel extends AbstractTableModel { //code here } You need to instantiate it in the JTable constructor like this: JTable table = new JTable(new MyTableModel()); So you cannot just leave it blank and expect it to "find" the new AbstractTableModel class.
You need to extend AbstractTableModel, and pass this as a parameter for the constructor of your JTable. (As Marc does). In addition to the required method, you need to define this method to show the actual checkboxes: public Class getColumnClass(int c) { return getValueAt(0, c).getClass(); } This tells you JTable how to render each cell.
If you don't override this, it will just be showed as a string.
If you clear all three check boxes (setting all three bound properties to false), there is no selection; only the lead selection is shown. You may notice that the "Cell Selection" checkbox is disabled in multiple interval selection mode. This is because cell selection is not supported in this mode in the demo.
You can specify selection by cell in multiple interval selection mode, but the result is a table that does not produce useful selections. You may also notice that changing any of the three selection options can affect the others. This is because allowing both row selection and column selection is exactly the same as enabling cell selection.
JTable automatically updates the three bound variables as necessary to keep them consistent. GetSelectedColumns which returns an array of column indexes. To retrieve the coordinates of the lead selection, refer to the selection models for the table itself and for the table's column model.
User selections generate a number of events. Writing Event Listeners lesson. Every table object uses a table model object to manage the actual table data.
This relationship is illustrated below. As the preceding code shows, implementing a table model can be simple. Your model might hold its data in an array, vector, or hash map, or it might get the data from an outside source such as a database.
It might even generate the data at execution time. TableDemo's custom table model, even though it is simple, can easily determine the data's type, helping the JTable display the data in the best format. SimpleTableDemo's automatically created table model, on the other hand, does not know that the # of Years column contains numbers (which should generally be right aligned and have a particular format).
It also does not know that the Vegetarian column contains boolean values, which can be represented by check boxes. The custom table model implemented in TableDemo does not let you edit the name columns; it does, however, let you edit the other columns. In SimpleTableDemo, all cells are editable.
Bold font indicates the code that makes this table's model different from the table model defined automatically for SimpleTableDemo. A table model can have a set of listeners that are notified whenever the table data changes. In the following example code, SimpleTableDemo is extended to include such a listener.
New code is in bold. This can be a complex procedure, but is already implemented in DefaultTableModel. You can either allow JTable to use its default instance of DefaultTableModel, or create your own custom subclass of DefaultTableModel.
This class implements a simple framework for constructing TableModelEvent objects. Your custom class simply needs to invoke one the following AbstractTableModel methods each time table data is changed by an external source. Before you go on to the next few tasks, you need to understand how tables draw their cells.
You might expect each cell in a table to be a component. However, for performance reasons, Swing tables are implemented differently. Instead, a single cell renderer is generally used to draw all of the cells that contain the same type of data.
You can think of the renderer as a configurable ink stamp that the table uses to stamp appropriately formatted data onto each cell. When the user starts to edit a cell's data, a cell editor takes over the cell, controlling the cell's editing behavior. For example, each cell in the # of Years column in TableDemo contains Number data — specifically, an Integer object.
By default, the cell renderer for a Number-containing column uses a single JLabel instance to draw the appropriate numbers, right-aligned, on the column's cells. If the user begins editing one of the cells, the default cell editor uses a right-aligned JTextField to control the cell editing. To choose the renderer that displays the cells in a column, a table first determines whether you specified a renderer for that particular column.
If you did not, then the table invokes the table model's getColumnClass method, which gets the data type of the column's cells. Next, the table compares the column's data type with a list of data types for which cell renderers are registered. This list is initialized by the table, but you can add to it or change it.
Boolean — rendered with a check box. Number — rendered by a right-aligned label.
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