Every table object uses a table model object to manage the actual table data. A table model object must implement the TableModel interface. If the programmer does not provide a table model object, JTable automatically creates an instance of DefaultTableModel. This relationship is illustrated below.
Just so, TableModel is used to specify how the table’s data is stored and retrieval of this data. JTable’s data is often in two-dimensional structure such as a two-dimension array or a Vector of Vectors. TableModel also is used to specify how data can be editable in the Table. Indeed, If the data being stored in a JTable is associated with a java object, you will have to work harder to synchronize changes to the JTable with the underlying data. Suppose you have an ArrayList of some Java objects. You have to convert this data into Object[][] to populate the JTable. Keeping this in consideration, JTable in Java has three constructors. They are: JTable (): A new table will be created with empty cells. JTable (int r, int c): A table will be created with the size as r*c. JTable (Object [ ] [ ] d, Object [ ]col): A table will be created with the specified data where []col describes the names of column. Besides, The simplest way to create a table model is by extending the AbstractTableModel abstract class which implements the TableModel interface. The AbstractTableModel implements the standard behaviour of a table model. It implements almost all the methods of the TableModel interface, except three methods.
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