# Class AbstractTableModel

java.lang.Object
javax.swing.table.AbstractTableModel

All Implemented Interfaces:
  `Serializable, TableModel`

Direct Known Subclasses:
  `DefaultTableModel`

public abstract class AbstractTableModel extends Object implements TableModel, Serializable
This abstract class provides default implementations for most of the methods in the `TableModel` interface. It takes care of the management of listeners and provides some conveniences for generating `TableModelEvents` and dispatching them to the listeners. To create a concrete `TableModel` as a subclass of `AbstractTableModel` you need only provide implementations for the following three methods:

     public int getRowCount();
     public int getColumnCount();
     public Object getValueAt(int row, int column);

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans has been added to the `java.beans` package. Please see `XMLEncoder`.

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `protected EventListenerList`
  `listenerList`
  List of listeners

- ## Constructor Summary

  Constructors
  Modifier
  Constructor
  Description
  `protected`
  `AbstractTableModel()`
  Constructor for subclasses to call.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `addTableModelListener(TableModelListener l)`
  Adds a listener to the list that's notified each time a change to the data model occurs.
  `int`
  `findColumn(String columnName)`
  Returns a column given its name.
  `void`
  `fireTableCellUpdated(int row, int column)`
  Notifies all listeners that the value of the cell at `[row, column]` has been updated.
  `void`
  `fireTableChanged(TableModelEvent e)`
  Forwards the given notification event to all `TableModelListeners` that registered themselves as listeners for this table model.
  `void`
  `fireTableDataChanged()`
  Notifies all listeners that all cell values in the table's rows may have changed.
  `void`
  `fireTableRowsDeleted(int firstRow, int lastRow)`
  Notifies all listeners that rows in the range `[firstRow, lastRow]`, inclusive, have been deleted.
  `void`
  `fireTableRowsInserted(int firstRow, int lastRow)`
  Notifies all listeners that rows in the range `[firstRow, lastRow]`, inclusive, have been inserted.
  `void`
  `fireTableRowsUpdated(int firstRow, int lastRow)`
  Notifies all listeners that rows in the range `[firstRow, lastRow]`, inclusive, have been updated.
  `void`
  `fireTableStructureChanged()`
  Notifies all listeners that the table's structure has changed.
  `Class<?>`
  `getColumnClass(int columnIndex)`
  Returns `Object.class` regardless of `columnIndex`.
  `String`
  `getColumnName(int column)`
  Returns a default name for the column using spreadsheet conventions: A, B, C, ...
  `<T extends EventListener>
  T[]`
  `getListeners(Class<T> listenerType)`
  Returns an array of all the objects currently registered as `FooListener`s upon this `AbstractTableModel`.
  `TableModelListener[]`
  `getTableModelListeners()`
  Returns an array of all the table model listeners registered on this model.
  `boolean`
  `isCellEditable(int rowIndex, int columnIndex)`
  Returns false.
  `void`
  `removeTableModelListener(TableModelListener l)`
  Removes a listener from the list that's notified each time a change to the data model occurs.
  `void`
  `setValueAt(Object aValue, int rowIndex, int columnIndex)`
  This empty implementation is provided so users don't have to implement this method if their data model is not editable.

  ### Methods declared in class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`
  Modifier and Type
  Method
  Description
  `protected Object`
  `clone()`
  Creates and returns a copy of this object.
  `boolean`
  `equals(Object obj)`
  Indicates whether some other object is "equal to" this one.
  `protected void`
  `finalize()`
  Deprecated, for removal: This API element is subject to removal in a future version.
  Finalization is deprecated and subject to removal in a future release.
  `final Class<?>`
  `getClass()`
  Returns the runtime class of this `Object`.
  `int`
  `hashCode()`
  Returns a hash code value for this object.
  `final void`
  `notify()`
  Wakes up a single thread that is waiting on this object's monitor.
  `final void`
  `notifyAll()`
  Wakes up all threads that are waiting on this object's monitor.
  `String`
  `toString()`
  Returns a string representation of the object.
  `final void`
  `wait()`
  Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
  `final void`
  `wait(long timeoutMillis)`
  Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
  `final void`
  `wait(long timeoutMillis, int nanos)`
  Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

  ### Methods declared in interface TableModel

  `getColumnCount, getRowCount, getValueAt`
  Modifier and Type
  Method
  Description
  `int`
  `getColumnCount()`
  Returns the number of columns in the model.
  `int`
  `getRowCount()`
  Returns the number of rows in the model.
  `Object`
  `getValueAt(int rowIndex, int columnIndex)`
  Returns the value for the cell at `columnIndex` and `rowIndex`.

- ## Field Details

  - ### listenerList

    protected EventListenerList listenerList
    List of listeners

- ## Constructor Details

  - ### AbstractTableModel

    protected AbstractTableModel()
    Constructor for subclasses to call.

- ## Method Details

  - ### getColumnName

    public String getColumnName(int column)
    Returns a default name for the column using spreadsheet conventions: A, B, C, ... Z, AA, AB, etc. If `column` cannot be found, returns an empty string.
    Specified by:
      `getColumnName` in interface `TableModel`
    Parameters:
      `column` - the column being queried
    Returns:
      a string containing the default name of `column`

  - ### findColumn

    public int findColumn(String columnName)
    Returns a column given its name. Implementation is naive so this should be overridden if this method is to be called often. This method is not in the `TableModel` interface and is not used by the `JTable`.
    Parameters:
      `columnName` - string containing name of column to be located
    Returns:
      the column with `columnName`, or -1 if not found

  - ### getColumnClass

    public Class<?> getColumnClass(int columnIndex)
    Returns `Object.class` regardless of `columnIndex`.
    Specified by:
      `getColumnClass` in interface `TableModel`
    Parameters:
      `columnIndex` - the column being queried
    Returns:
      the Object.class

  - ### isCellEditable

    public boolean isCellEditable(int rowIndex, int columnIndex)
    Returns false. This is the default implementation for all cells.
    Specified by:
      `isCellEditable` in interface `TableModel`
    Parameters:
      `rowIndex` - the row being queried
      `columnIndex` - the column being queried
    Returns:
      false
    See Also:
      - `TableModel.setValueAt(Object, int, int)`

  - ### setValueAt

    public void setValueAt(Object aValue, int rowIndex, int columnIndex)
    This empty implementation is provided so users don't have to implement this method if their data model is not editable.
    Specified by:
      `setValueAt` in interface `TableModel`
    Parameters:
      `aValue` - value to assign to cell
      `rowIndex` - row of cell
      `columnIndex` - column of cell
    See Also:
      - `TableModel.getValueAt(int, int)`
      - `TableModel.isCellEditable(int, int)`

  - ### addTableModelListener

    public void addTableModelListener(TableModelListener l)
    Adds a listener to the list that's notified each time a change to the data model occurs.
    Specified by:
      `addTableModelListener` in interface `TableModel`
    Parameters:
      `l` - the TableModelListener

  - ### removeTableModelListener

    public void removeTableModelListener(TableModelListener l)
    Removes a listener from the list that's notified each time a change to the data model occurs.
    Specified by:
      `removeTableModelListener` in interface `TableModel`
    Parameters:
      `l` - the TableModelListener

  - ### getTableModelListeners

    public TableModelListener[] getTableModelListeners()
    Returns an array of all the table model listeners registered on this model.
    Returns:
      all of this model's `TableModelListener`s or an empty array if no table model listeners are currently registered
    Since:
      1.4
    See Also:
      - `addTableModelListener(TableModelListener)`
      - `removeTableModelListener(TableModelListener)`

  - ### fireTableDataChanged

    public void fireTableDataChanged()
    Notifies all listeners that all cell values in the table's rows may have changed. The number of rows may also have changed and the `JTable` should redraw the table from scratch. The structure of the table (as in the order of the columns) is assumed to be the same.
    See Also:
      - `TableModelEvent`
      - `EventListenerList`
      - `JTable.tableChanged(TableModelEvent)`

  - ### fireTableStructureChanged

    public void fireTableStructureChanged()
    Notifies all listeners that the table's structure has changed. The number of columns in the table, and the names and types of the new columns may be different from the previous state. If the `JTable` receives this event and its `autoCreateColumnsFromModel` flag is set it discards any table columns that it had and reallocates default columns in the order they appear in the model. This is the same as calling `setModel(TableModel)` on the `JTable`.
    See Also:
      - `TableModelEvent`
      - `EventListenerList`

  - ### fireTableRowsInserted

    public void fireTableRowsInserted(int firstRow, int lastRow)
    Notifies all listeners that rows in the range `[firstRow, lastRow]`, inclusive, have been inserted.
    Parameters:
      `firstRow` - the first row
      `lastRow` - the last row
    See Also:
      - `TableModelEvent`
      - `EventListenerList`

  - ### fireTableRowsUpdated

    public void fireTableRowsUpdated(int firstRow, int lastRow)
    Notifies all listeners that rows in the range `[firstRow, lastRow]`, inclusive, have been updated.
    Parameters:
      `firstRow` - the first row
      `lastRow` - the last row
    See Also:
      - `TableModelEvent`
      - `EventListenerList`

  - ### fireTableRowsDeleted

    public void fireTableRowsDeleted(int firstRow, int lastRow)
    Notifies all listeners that rows in the range `[firstRow, lastRow]`, inclusive, have been deleted.
    Parameters:
      `firstRow` - the first row
      `lastRow` - the last row
    See Also:
      - `TableModelEvent`
      - `EventListenerList`

  - ### fireTableCellUpdated

    public void fireTableCellUpdated(int row, int column)
    Notifies all listeners that the value of the cell at `[row, column]` has been updated.
    Parameters:
      `row` - row of cell which has been updated
      `column` - column of cell which has been updated
    See Also:
      - `TableModelEvent`
      - `EventListenerList`

  - ### fireTableChanged

    public void fireTableChanged(TableModelEvent e)
    Forwards the given notification event to all `TableModelListeners` that registered themselves as listeners for this table model.
    Parameters:
      `e` - the event to be forwarded
    See Also:
      - `addTableModelListener(TableModelListener)`
      - `TableModelEvent`
      - `EventListenerList`

  - ### getListeners

    public <T extends EventListener> T[] getListeners(Class<T> listenerType)
    Returns an array of all the objects currently registered as `FooListener`s upon this `AbstractTableModel`. `FooListener`s are registered using the `addFooListener` method.

    You can specify the `listenerType` argument with a class literal, such as `FooListener.class`. For example, you can query a model `m` for its table model listeners with the following code:

        TableModelListener[] tmls = (TableModelListener[])(m.getListeners(TableModelListener.class));

    If no such listeners exist, this method returns an empty array.
    Type Parameters:
      `T` - the listener type
    Parameters:
      `listenerType` - the type of listeners requested
    Returns:
      an array of all objects registered as `FooListener`s on this component, or an empty array if no such listeners have been added
    Throws:
      `ClassCastException` - if `listenerType` doesn't specify a class or interface that implements `java.util.EventListener`
    Since:
      1.3
    See Also:
      - `getTableModelListeners()`