Java Doc for GenericTableModel.java in  » Development » jga-Generic-Algorithms » net » sf » jga » swing » Java Source Code / Java DocumentationJava Source Code and Java Documentation

This class uses GenericTableColumns to store information about each specific column. To keep the correct column classes in use by the table, it is important to build the table using the constructor that takes both the data model and the column model, as shown in the code sample below. Otherwise, the table will build a default TableColumnModel of its own, and additions of columns to the data model won't be reflected in the column model.

Another caveat on the use of this class is that if columns are to be added to the model after it has been given to a table, then the table's autoCreateColumnsFromModel flag must be false (otherwise, the table will discard the existing columns and attempt to build new ones: JTable won't know how to create instances of the generic classes.

Working with this class can be fairly simple. To build a simple table that allows for the display and editing of a typical business object (Item, in this example),

 List data = // initialized from somewhere
 GenericTableModel model =
 new GenericTableModel(Item.class, data);
 // adds a read-only column for the object's id
 model.addColumn(Integer.class, "ID");
 // adds a read-only column for the object's name
 model.addColumn(String.class, "Name");
 // adds an editable column for the object's description
 model.addColumn(String.class, "Desc", true);
 // adds an editable column for the object's count
 model.addColumn(Integer.class, "Count", true);
 // adds an editable column for the object's price
 model.addColumn(BigDecimal.class, "Price", true);
 JTable table = new JTable(model, model.getColumnModel());
 

In this example, the Item class is presumed to have the appropriate getter/setter methods defined.

Copyright © 2003-2005 David A. Hall
author:
   David A. Hall