Jtable java

The JTable class is a part of Java Swing Package and is generally used to display or edit two-dimensional data that is having both rows and columns. It is similar to a spreadsheet, jtable java.

Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available. With the JTable class you can display tables of data, optionally allowing the user to edit the data. JTable does not contain or cache data; it is simply a view of your data. Here is a picture of a typical table displayed within a scroll pane:. The rest of this section shows you how to accomplish some common table-related tasks.

Jtable java

The JTable has many facilities that make it possible to customize its rendering and editing but provides defaults for these features so that simple tables can be set up easily. By default, a JTable will adjust its width such that a horizontal scrollbar is unnecessary. Note that if you wish to use a JTable in a standalone view outside of a JScrollPane and want the header displayed, you can get it using getTableHeader and display it separately. To enable sorting and filtering of rows, use a RowSorter. You can set up a row sorter in either of two ways: Directly set the RowSorter. For example: table. For example: setAutoCreateRowSorter true. When designing applications that use the JTable it is worth paying close attention to the data structures that will represent the table's data. As well as copying the data from an application into the DefaultTableModel , it is also possible to wrap the data in the methods of the TableModel interface so that the data can be passed to the JTable directly, as in the example above. This often results in more efficient applications because the model is free to choose the internal representation that best suits the data. A good rule of thumb for deciding whether to use the AbstractTableModel or the DefaultTableModel is to use the AbstractTableModel as the base class for creating subclasses and the DefaultTableModel when subclassing is not required. The "TableExample" directory in the demo area of the source distribution gives a number of complete examples of JTable usage, covering how the JTable can be used to provide an editable view of data taken from a database and how to modify the columns in the display to use specialized renderers and editors. The JTable uses integers exclusively to refer to both the rows and the columns of the model that it displays. The JTable simply takes a tabular range of cells and uses getValueAt int, int to retrieve the values from the model during painting. It is important to remember that the column and row indexes returned by various JTable methods are in terms of the JTable the view and are not necessarily the same indexes used by the model.

Sets a default cell editor to be used if no editor has been set in a TableColumn. The call to fireEditingStopped lets the table know that it can deactivate the editor, letting the cell be handled by jtable java renderer again, jtable java.

This article shows a simple example of JTable. This is similar to a spreadsheet. Let us consider some examples. Say that you want to display a list of employees belonging to an organization. This should display the various attributes of employees. For example, employee id, name, hourly rate, part-time status etc.

This article shows a simple example of JTable. This is similar to a spreadsheet. Let us consider some examples. Say that you want to display a list of employees belonging to an organization. This should display the various attributes of employees. For example, employee id, name, hourly rate, part-time status etc. The display will be more like a database table display of rows and columns. In this case, the id,name, hourly rate are the columns. The number of rows might differ based on the number of employees in the organization.

Jtable java

We may make money when you click on links to our partners. Learn More. In Java, tables are used to arrange data into columns and rows. A column is space that runs horizontally on a table, while a row is a space that runs horizontally in your table.

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The columnIndex is passed to this method. Coordinate conversions will be necessary when using the row based methods of JTable with the underlying TableModel. Definition Call the individual constraints min[i], max[i], and pref[i]. This code attempts to build a table with minimum amount of effort. Note that the column values are declared based on their type. Here's the code: import javax. Returns true if whenever the model changes, a new RowSorter should be created and installed as the table's sorter; otherwise, returns false. Returns true if the cell at row and column is editable. J2SE 5 adds methods to JTable to provide convenient access to some common printing needs. The source code is a bit too long to include here, but you can find it in IntegerEditor. If nothing is being edited, returns null. This is needed as we are overriding 2 methods:. The easiest way to print out a table is to invoke JTable. Parameters: row - the row index where the desired cell is located column - the column index where the desired cell is located in the display; this is not necessarily the same as the column index in the data model for the table; the convertColumnIndexToView int method may be used to convert a data model column index to a display column index includeSpacing - if false, return the true cell bounds - computed by subtracting the intercell spacing from the height and widths of the column and row models Returns: the rectangle containing the cell at location row , column See Also: getIntercellSpacing doLayout public void doLayout Causes this table to lay out its rows and columns. Also, text-based columns should be left-aligned and numerical values should be right-aligned.

The JTable has many facilities that make it possible to customize its rendering and editing but provides defaults for these features so that simple tables can be set up easily.

If not, finds the class of the data in this column using getColumnClass and returns the default renderer for this type of data. Constructors in JTable :. Coordinate conversions will be necessary when using the row based methods of JTable with the underlying TableModel. Returns: the value of the dragEnabled property Since: 1. It is legal to have a null tableHeader. Setting both rowSelectionEnabled and columnSelectionEnabled to a value has the side effect of also setting cellSelectionEnabled to that value. Now press the mouse button and drag to the right or left. This often results in more efficient applications because the model is free to choose the internal representation that best suits the data. If extending DefaultTableCellRenderer is insufficient, you can build a renderer using another superclass. This is called rendering. If true, setModel will clear any existing columns and create new columns from the new model. Parameters: printMode - the printing mode that the printable should use headerFormat - a MessageFormat specifying the text to be used in printing a header, or null for none footerFormat - a MessageFormat specifying the text to be used in printing a footer, or null for none Returns: a Printable for printing this JTable Since: 1. Java Swing Internal Frame with examples. Although this effectively prevents the table from being changed, it doesn't provide a good user experience.