DefaultTableModel (Java Platform SE 8 )
Keywords: javax.swing.table.DefaultTableModel class
Date: 2015-11-19

javax.swing.table

## Class DefaultTableModel

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

- All Implemented Interfaces:
    Serializable, TableModel

      public class DefaultTableModel
      extends AbstractTableModel
      implements Serializable

  This is an implementation of `TableModel` that uses a `Vector` of `Vectors` to store the cell value objects.

  Warning: `DefaultTableModel` returns a column class of `Object`. When `DefaultTableModel` is used with a `TableRowSorter` this will result in extensive use of `toString`, which for non-`String` data types is expensive. If you use `DefaultTableModel` with a `TableRowSorter` you are strongly encouraged to override `getColumnClass` to return the appropriate type.

  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`.

  See Also:
    `TableModel`, `getDataVector()`

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected Vector` | `columnIdentifiers` The `Vector` of column identifiers.
    `protected Vector` | `dataVector` The `Vector` of `Vectors` of `Object` values.

    - ### Fields inherited from class javax.swing.table.AbstractTableModel

      `listenerList`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `DefaultTableModel()` Constructs a default `DefaultTableModel` which is a table of zero columns and zero rows.
    `DefaultTableModel(int rowCount, int columnCount)` Constructs a `DefaultTableModel` with `rowCount` and `columnCount` of `null` object values.
    `DefaultTableModel(Object[][] data, Object[] columnNames)` Constructs a `DefaultTableModel` and initializes the table by passing `data` and `columnNames` to the `setDataVector` method.
    `DefaultTableModel(Object[] columnNames, int rowCount)` Constructs a `DefaultTableModel` with as many columns as there are elements in `columnNames` and `rowCount` of `null` object values.
    `DefaultTableModel(Vector columnNames, int rowCount)` Constructs a `DefaultTableModel` with as many columns as there are elements in `columnNames` and `rowCount` of `null` object values.
    `DefaultTableModel(Vector data, Vector columnNames)` Constructs a `DefaultTableModel` and initializes the table by passing `data` and `columnNames` to the `setDataVector` method.

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addColumn(Object columnName)` Adds a column to the model.
    `void` | `addColumn(Object columnName, Object[] columnData)` Adds a column to the model.
    `void` | `addColumn(Object columnName, Vector columnData)` Adds a column to the model.
    `void` | `addRow(Object[] rowData)` Adds a row to the end of the model.
    `void` | `addRow(Vector rowData)` Adds a row to the end of the model.
    `protected static Vector` | `convertToVector(Object[] anArray)` Returns a vector that contains the same objects as the array.
    `protected static Vector` | `convertToVector(Object[][] anArray)` Returns a vector of vectors that contains the same objects as the array.
    `int` | `getColumnCount()` Returns the number of columns in this data table.
    `String` | `getColumnName(int column)` Returns the column name.
    `Vector` | `getDataVector()` Returns the `Vector` of `Vectors` that contains the table's data values.
    `int` | `getRowCount()` Returns the number of rows in this data table.
    `Object` | `getValueAt(int row, int column)` Returns an attribute value for the cell at `row` and `column`.
    `void` | `insertRow(int row, Object[] rowData)` Inserts a row at `row` in the model.
    `void` | `insertRow(int row, Vector rowData)` Inserts a row at `row` in the model.
    `boolean` | `isCellEditable(int row, int column)` Returns true regardless of parameter values.
    `void` | `moveRow(int start, int end, int to)` Moves one or more rows from the inclusive range `start` to `end` to the `to` position in the model.
    `void` | `newDataAvailable(TableModelEvent event)` Equivalent to `fireTableChanged`.
    `void` | `newRowsAdded(TableModelEvent e)` Ensures that the new rows have the correct number of columns.
    `void` | `removeRow(int row)` Removes the row at `row` from the model.
    `void` | `rowsRemoved(TableModelEvent event)` Equivalent to `fireTableChanged`.
    `void` | `setColumnCount(int columnCount)` Sets the number of columns in the model.
    `void` | `setColumnIdentifiers(Object[] newIdentifiers)` Replaces the column identifiers in the model.
    `void` | `setColumnIdentifiers(Vector columnIdentifiers)` Replaces the column identifiers in the model.
    `void` | `setDataVector(Object[][] dataVector, Object[] columnIdentifiers)` Replaces the value in the `dataVector` instance variable with the values in the array `dataVector`.
    `void` | `setDataVector(Vector dataVector, Vector columnIdentifiers)` Replaces the current `dataVector` instance variable with the new `Vector` of rows, `dataVector`.
    `void` | `setNumRows(int rowCount)` Obsolete as of Java 2 platform v1.3.
    `void` | `setRowCount(int rowCount)` Sets the number of rows in the model.
    `void` | `setValueAt(Object aValue, int row, int column)` Sets the object value for the cell at `column` and `row`.

    - ### Methods inherited from class javax.swing.table.AbstractTableModel

      `addTableModelListener, findColumn, fireTableCellUpdated, fireTableChanged, fireTableDataChanged, fireTableRowsDeleted, fireTableRowsInserted, fireTableRowsUpdated, fireTableStructureChanged, getColumnClass, getListeners, getTableModelListeners, removeTableModelListener`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### dataVector

          protected Vector dataVector

      The `Vector` of `Vectors` of `Object` values.

    - #### columnIdentifiers

          protected Vector columnIdentifiers

      The `Vector` of column identifiers.

  - ### Constructor Detail

    - #### DefaultTableModel

          public DefaultTableModel()

      Constructs a default `DefaultTableModel` which is a table of zero columns and zero rows.

    - #### DefaultTableModel

          public DefaultTableModel(int rowCount,
                                   int columnCount)

      Constructs a `DefaultTableModel` with `rowCount` and `columnCount` of `null` object values.
      Parameters:
        `rowCount` - the number of rows the table holds
        `columnCount` - the number of columns the table holds
      See Also:
        `setValueAt(java.lang.Object, int, int)`

    - #### DefaultTableModel

          public DefaultTableModel(Vector columnNames,
                                   int rowCount)

      Constructs a `DefaultTableModel` with as many columns as there are elements in `columnNames` and `rowCount` of `null` object values. Each column's name will be taken from the `columnNames` vector.
      Parameters:
        `columnNames` - `vector` containing the names of the new columns; if this is `null` then the model has no columns
        `rowCount` - the number of rows the table holds
      See Also:
        `setDataVector(java.util.Vector, java.util.Vector)`, `setValueAt(java.lang.Object, int, int)`

    - #### DefaultTableModel

          public DefaultTableModel(Object[] columnNames,
                                   int rowCount)

      Constructs a `DefaultTableModel` with as many columns as there are elements in `columnNames` and `rowCount` of `null` object values. Each column's name will be taken from the `columnNames` array.
      Parameters:
        `columnNames` - `array` containing the names of the new columns; if this is `null` then the model has no columns
        `rowCount` - the number of rows the table holds
      See Also:
        `setDataVector(java.util.Vector, java.util.Vector)`, `setValueAt(java.lang.Object, int, int)`

    - #### DefaultTableModel

          public DefaultTableModel(Vector data,
                                   Vector columnNames)

      Constructs a `DefaultTableModel` and initializes the table by passing `data` and `columnNames` to the `setDataVector` method.
      Parameters:
        `data` - the data of the table, a `Vector` of `Vector`s of `Object` values
        `columnNames` - `vector` containing the names of the new columns
      See Also:
        `getDataVector()`, `setDataVector(java.util.Vector, java.util.Vector)`

    - #### DefaultTableModel

          public DefaultTableModel(Object[][] data,
                                   Object[] columnNames)

      Constructs a `DefaultTableModel` and initializes the table by passing `data` and `columnNames` to the `setDataVector` method. The first index in the `Object[][]` array is the row index and the second is the column index.
      Parameters:
        `data` - the data of the table
        `columnNames` - the names of the columns
      See Also:
        `getDataVector()`, `setDataVector(java.util.Vector, java.util.Vector)`

  - ### Method Detail

    - #### getDataVector

          public Vector getDataVector()

      Returns the `Vector` of `Vectors` that contains the table's data values. The vectors contained in the outer vector are each a single row of values. In other words, to get to the cell at row 1, column 5:

      `((Vector)getDataVector().elementAt(1)).elementAt(5);`

      Returns:
        the vector of vectors containing the tables data values
      See Also:
        `newDataAvailable(javax.swing.event.TableModelEvent)`, `newRowsAdded(javax.swing.event.TableModelEvent)`, `setDataVector(java.util.Vector, java.util.Vector)`

    - #### setDataVector

          public void setDataVector(Vector dataVector,
                                    Vector columnIdentifiers)

      Replaces the current `dataVector` instance variable with the new `Vector` of rows, `dataVector`. Each row is represented in `dataVector` as a `Vector` of `Object` values. `columnIdentifiers` are the names of the new columns. The first name in `columnIdentifiers` is mapped to column 0 in `dataVector`. Each row in `dataVector` is adjusted to match the number of columns in `columnIdentifiers` either by truncating the `Vector` if it is too long, or adding `null` values if it is too short.

      Note that passing in a `null` value for `dataVector` results in unspecified behavior, an possibly an exception.

      Parameters:
        `dataVector` - the new data vector
        `columnIdentifiers` - the names of the columns
      See Also:
        `getDataVector()`

    - #### setDataVector

          public void setDataVector(Object[][] dataVector,
                                    Object[] columnIdentifiers)

      Replaces the value in the `dataVector` instance variable with the values in the array `dataVector`. The first index in the `Object[][]` array is the row index and the second is the column index. `columnIdentifiers` are the names of the new columns.
      Parameters:
        `dataVector` - the new data vector
        `columnIdentifiers` - the names of the columns
      See Also:
        `setDataVector(Vector, Vector)`

    - #### newDataAvailable

          public void newDataAvailable(TableModelEvent event)

      Equivalent to `fireTableChanged`.
      Parameters:
        `event` - the change event

    - #### newRowsAdded

          public void newRowsAdded(TableModelEvent e)

      Ensures that the new rows have the correct number of columns. This is accomplished by using the `setSize` method in `Vector` which truncates vectors which are too long, and appends `null`s if they are too short. This method also sends out a `tableChanged` notification message to all the listeners.
      Parameters:
        `e` - this `TableModelEvent` describes where the rows were added. If `null` it assumes all the rows were newly added
      See Also:
        `getDataVector()`

    - #### rowsRemoved

          public void rowsRemoved(TableModelEvent event)

      Equivalent to `fireTableChanged`.
      Parameters:
        `event` - the change event

    - #### setNumRows

          public void setNumRows(int rowCount)

      Obsolete as of Java 2 platform v1.3. Please use `setRowCount` instead.

    - #### setRowCount

          public void setRowCount(int rowCount)

      Sets the number of rows in the model. If the new size is greater than the current size, new rows are added to the end of the model If the new size is less than the current size, all rows at index `rowCount` and greater are discarded.
      Since:
        1.3
      See Also:
        `setColumnCount(int)`

    - #### addRow

          public void addRow(Vector rowData)

      Adds a row to the end of the model. The new row will contain `null` values unless `rowData` is specified. Notification of the row being added will be generated.
      Parameters:
        `rowData` - optional data of the row being added

    - #### addRow

          public void addRow(Object[] rowData)

      Adds a row to the end of the model. The new row will contain `null` values unless `rowData` is specified. Notification of the row being added will be generated.
      Parameters:
        `rowData` - optional data of the row being added

    - #### insertRow

          public void insertRow(int row,
                                Vector rowData)

      Inserts a row at `row` in the model. The new row will contain `null` values unless `rowData` is specified. Notification of the row being added will be generated.
      Parameters:
        `row` - the row index of the row to be inserted
        `rowData` - optional data of the row being added
      Throws:
        `ArrayIndexOutOfBoundsException` - if the row was invalid

    - #### insertRow

          public void insertRow(int row,
                                Object[] rowData)

      Inserts a row at `row` in the model. The new row will contain `null` values unless `rowData` is specified. Notification of the row being added will be generated.
      Parameters:
        `row` - the row index of the row to be inserted
        `rowData` - optional data of the row being added
      Throws:
        `ArrayIndexOutOfBoundsException` - if the row was invalid

    - #### moveRow

          public void moveRow(int start,
                              int end,
                              int to)

      Moves one or more rows from the inclusive range `start` to `end` to the `to` position in the model. After the move, the row that was at index `start` will be at index `to`. This method will send a `tableChanged` notification message to all the listeners.

            Examples of moves:

            1. moveRow(1,3,5);
                    a|B|C|D|e|f|g|h|i|j|k   - before
                    a|e|f|g|h|B|C|D|i|j|k   - after

            2. moveRow(6,7,1);
                    a|b|c|d|e|f|G|H|i|j|k   - before
                    a|G|H|b|c|d|e|f|i|j|k   - after

      Parameters:
        `start` - the starting row index to be moved
        `end` - the ending row index to be moved
        `to` - the destination of the rows to be moved
      Throws:
        `ArrayIndexOutOfBoundsException` - if any of the elements would be moved out of the table's range

    - #### removeRow

          public void removeRow(int row)

      Removes the row at `row` from the model. Notification of the row being removed will be sent to all the listeners.
      Parameters:
        `row` - the row index of the row to be removed
      Throws:
        `ArrayIndexOutOfBoundsException` - if the row was invalid

    - #### setColumnIdentifiers

          public void setColumnIdentifiers(Vector columnIdentifiers)

      Replaces the column identifiers in the model. If the number of `newIdentifier`s is greater than the current number of columns, new columns are added to the end of each row in the model. If the number of `newIdentifier`s is less than the current number of columns, all the extra columns at the end of a row are discarded.
      Parameters:
        `columnIdentifiers` - vector of column identifiers. If `null`, set the model to zero columns
      See Also:
        `setNumRows(int)`

    - #### setColumnIdentifiers

          public void setColumnIdentifiers(Object[] newIdentifiers)

      Replaces the column identifiers in the model. If the number of `newIdentifier`s is greater than the current number of columns, new columns are added to the end of each row in the model. If the number of `newIdentifier`s is less than the current number of columns, all the extra columns at the end of a row are discarded.
      Parameters:
        `newIdentifiers` - array of column identifiers. If `null`, set the model to zero columns
      See Also:
        `setNumRows(int)`

    - #### setColumnCount

          public void setColumnCount(int columnCount)

      Sets the number of columns in the model. If the new size is greater than the current size, new columns are added to the end of the model with `null` cell values. If the new size is less than the current size, all columns at index `columnCount` and greater are discarded.
      Parameters:
        `columnCount` - the new number of columns in the model
      Since:
        1.3
      See Also:
        `setColumnCount(int)`

    - #### addColumn

          public void addColumn(Object columnName)

      Adds a column to the model. The new column will have the identifier `columnName`, which may be null. This method will send a `tableChanged` notification message to all the listeners. This method is a cover for `addColumn(Object, Vector)` which uses `null` as the data vector.
      Parameters:
        `columnName` - the identifier of the column being added

    - #### addColumn

          public void addColumn(Object columnName,
                                Vector columnData)

      Adds a column to the model. The new column will have the identifier `columnName`, which may be null. `columnData` is the optional vector of data for the column. If it is `null` the column is filled with `null` values. Otherwise, the new data will be added to model starting with the first element going to row 0, etc. This method will send a `tableChanged` notification message to all the listeners.
      Parameters:
        `columnName` - the identifier of the column being added
        `columnData` - optional data of the column being added

    - #### addColumn

          public void addColumn(Object columnName,
                                Object[] columnData)

      Adds a column to the model. The new column will have the identifier `columnName`. `columnData` is the optional array of data for the column. If it is `null` the column is filled with `null` values. Otherwise, the new data will be added to model starting with the first element going to row 0, etc. This method will send a `tableChanged` notification message to all the listeners.
      See Also:
        `addColumn(Object, Vector)`

    - #### getRowCount

          public int getRowCount()

      Returns the number of rows in this data table.
      Specified by:
        `getRowCount` in interface `TableModel`
      Returns:
        the number of rows in the model
      See Also:
        `TableModel.getColumnCount()`

    - #### getColumnCount

          public int getColumnCount()

      Returns the number of columns in this data table.
      Specified by:
        `getColumnCount` in interface `TableModel`
      Returns:
        the number of columns in the model
      See Also:
        `TableModel.getRowCount()`

    - #### getColumnName

          public String getColumnName(int column)

      Returns the column name.
      Specified by:
        `getColumnName` in interface `TableModel`
      Overrides:
        `getColumnName` in class `AbstractTableModel`
      Parameters:
        `column` - the column being queried
      Returns:
        a name for this column using the string value of the appropriate member in `columnIdentifiers`. If `columnIdentifiers` does not have an entry for this index, returns the default name provided by the superclass.

    - #### isCellEditable

          public boolean isCellEditable(int row,
                                        int column)

      Returns true regardless of parameter values.
      Specified by:
        `isCellEditable` in interface `TableModel`
      Overrides:
        `isCellEditable` in class `AbstractTableModel`
      Parameters:
        `row` - the row whose value is to be queried
        `column` - the column whose value is to be queried
      Returns:
        true
      See Also:
        `setValueAt(java.lang.Object, int, int)`

    - #### getValueAt

          public Object getValueAt(int row,
                                   int column)

      Returns an attribute value for the cell at `row` and `column`.
      Specified by:
        `getValueAt` in interface `TableModel`
      Parameters:
        `row` - the row whose value is to be queried
        `column` - the column whose value is to be queried
      Returns:
        the value Object at the specified cell
      Throws:
        `ArrayIndexOutOfBoundsException` - if an invalid row or column was given

    - #### setValueAt

          public void setValueAt(Object aValue,
                                 int row,
                                 int column)

      Sets the object value for the cell at `column` and `row`. `aValue` is the new value. This method will generate a `tableChanged` notification.
      Specified by:
        `setValueAt` in interface `TableModel`
      Overrides:
        `setValueAt` in class `AbstractTableModel`
      Parameters:
        `aValue` - the new value; this can be null
        `row` - the row whose value is to be changed
        `column` - the column whose value is to be changed
      Throws:
        `ArrayIndexOutOfBoundsException` - if an invalid row or column was given
      See Also:
        `TableModel.getValueAt(int, int)`, `TableModel.isCellEditable(int, int)`

    - #### convertToVector

          protected static Vector convertToVector(Object[] anArray)

      Returns a vector that contains the same objects as the array.
      Parameters:
        `anArray` - the array to be converted
      Returns:
        the new vector; if `anArray` is `null`, returns `null`

    - #### convertToVector

          protected static Vector convertToVector(Object[][] anArray)

      Returns a vector of vectors that contains the same objects as the array.
      Parameters:
        `anArray` - the double array to be converted
      Returns:
        the new vector of vectors; if `anArray` is `null`, returns `null`

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