Table Data
We’ve seen the TableColumnModel, which stores a lot of
information about the structure of a table but doesn’t contain the
actual data. The data that’s displayed in a JTable is stored in a TableModel. The TableModel interface describes the minimum
requirements for a model that supplies the information necessary to
display and edit a table’s cells and to show column headers. The
AbstractTableModel fills out most of
the TableModel interface, but leaves
the methods for retrieving the actual data undefined. The DefaultTableModel extends AbstractTableModel and provides an
implementation for storing data as a vector of vectors. We’ll look at
both the abstract and default table models in more detail later in this
chapter.
The TableModel Interface
All of the table models start with this interface. A
table model must be able to give out information on the number of rows
and columns in the table and have access to the values of the cells of
the table. The TableModel interface
also has methods that can be used to encode information about the
columns of the table (such as a localized name or class type) separate
from the column model.
Properties
The TableModel interface
supports the properties shown in Table 15-9. The columnCount is the number of columns in the data model. This does
not have to match the number of columns reported by the column
model. Likewise, rowCount is the
number of rows in the data model. columnName and columnClass are indexed properties that let you retrieve ...
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