javax.swing.table

## Class TableColumn

- java.lang.Object
- - javax.swing.table.TableColumn

All Implemented Interfaces:
  Serializable

    public class TableColumn
    extends Object
    implements Serializable

A `TableColumn` represents all the attributes of a column in a `JTable`, such as width, resizibility, minimum and maximum width. In addition, the `TableColumn` provides slots for a renderer and an editor that can be used to display and edit the values in this column.

It is also possible to specify renderers and editors on a per type basis rather than a per column basis - see the `setDefaultRenderer` method in the `JTable` class. This default mechanism is only used when the renderer (or editor) in the `TableColumn` is `null`.

The `TableColumn` stores the link between the columns in the `JTable` and the columns in the `TableModel`. The `modelIndex` is the column in the `TableModel`, which will be queried for the data values for the cells in this column. As the column moves around in the view this `modelIndex` does not change.

Note: Some implementations may assume that all `TableColumnModel`s are unique, therefore we would recommend that the same `TableColumn` instance not be added more than once to a `TableColumnModel`. To show `TableColumn`s with the same column of data from the model, create a new instance with the same `modelIndex`.

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 JavaBeansTM has been added to the `java.beans` package. Please see `XMLEncoder`.

See Also:
  `TableColumnModel`, `DefaultTableColumnModel`, `JTableHeader.getDefaultRenderer()`, `JTable.getDefaultRenderer(Class)`, `JTable.getDefaultEditor(Class)`, `JTable.getCellRenderer(int, int)`, `JTable.getCellEditor(int, int)`

### Field Summary

Fields
`static String` `CELL_RENDERER_PROPERTY` Obsolete as of Java 2 platform v1.3.
`protected TableCellEditor` `cellEditor` The editor used to edit the data cells of the column.
`protected TableCellRenderer` `cellRenderer` The renderer used to draw the data cells of the column.
`static String` `COLUMN_WIDTH_PROPERTY` Obsolete as of Java 2 platform v1.3.
`static String` `HEADER_RENDERER_PROPERTY` Obsolete as of Java 2 platform v1.3.
`static String` `HEADER_VALUE_PROPERTY` Obsolete as of Java 2 platform v1.3.
`protected TableCellRenderer` `headerRenderer` The renderer used to draw the header of the column.
`protected Object` `headerValue` The header value of the column.
`protected Object` `identifier` This object is not used internally by the drawing machinery of the `JTable`; identifiers may be set in the `TableColumn` as as an optional way to tag and locate table columns.
`protected boolean` `isResizable` If true, the user is allowed to resize the column; the default is true.
`protected int` `maxWidth` The maximum width of the column.
`protected int` `minWidth` The minimum width of the column.
`protected int` `modelIndex` The index of the column in the model which is to be displayed by this `TableColumn`.
`protected int` `resizedPostingDisableCount` Deprecated. as of Java 2 platform v1.3
`protected int` `width` The width of the column.

### Constructor Summary

Constructors
Constructor and Description
`TableColumn()` Cover method, using a default model index of 0, default width of 75, a `null` renderer and a `null` editor.
`TableColumn(int modelIndex)` Cover method, using a default width of 75, a `null` renderer and a `null` editor.
`TableColumn(int modelIndex, int width)` Cover method, using a `null` renderer and a `null` editor.
`TableColumn(int modelIndex, int width, TableCellRenderer cellRenderer, TableCellEditor cellEditor)` Creates and initializes an instance of `TableColumn` with the specified model index, width, cell renderer, and cell editor; all `TableColumn` constructors delegate to this one.

### Method Summary

Methods
`void` `addPropertyChangeListener(PropertyChangeListener listener)` Adds a `PropertyChangeListener` to the listener list.
`protected TableCellRenderer` `createDefaultHeaderRenderer()` As of Java 2 platform v1.3, this method is not called by the `TableColumn` constructor.
`void` `disableResizedPosting()` Deprecated. as of Java 2 platform v1.3
`void` `enableResizedPosting()` Deprecated. as of Java 2 platform v1.3
`TableCellEditor` `getCellEditor()` Returns the `TableCellEditor` used by the `JTable` to edit values for this column.
`TableCellRenderer` `getCellRenderer()` Returns the `TableCellRenderer` used by the `JTable` to draw values for this column.
`TableCellRenderer` `getHeaderRenderer()` Returns the `TableCellRenderer` used to draw the header of the `TableColumn`.
`Object` `getHeaderValue()` Returns the `Object` used as the value for the header renderer.
`Object` `getIdentifier()` Returns the `identifier` object for this column.
`int` `getMaxWidth()` Returns the maximum width for the `TableColumn`.
`int` `getMinWidth()` Returns the minimum width for the `TableColumn`.
`int` `getModelIndex()` Returns the model index for this column.
`int` `getPreferredWidth()` Returns the preferred width of the `TableColumn`.
`PropertyChangeListener[]` `getPropertyChangeListeners()` Returns an array of all the `PropertyChangeListener`s added to this TableColumn with addPropertyChangeListener().
`boolean` `getResizable()` Returns true if the user is allowed to resize the `TableColumn`'s width, false otherwise.
`int` `getWidth()` Returns the width of the `TableColumn`.
`void` `removePropertyChangeListener(PropertyChangeListener listener)` Removes a `PropertyChangeListener` from the listener list.
`void` `setCellEditor(TableCellEditor cellEditor)` Sets the editor to used by when a cell in this column is edited.
`void` `setCellRenderer(TableCellRenderer cellRenderer)` Sets the `TableCellRenderer` used by `JTable` to draw individual values for this column.
`void` `setHeaderRenderer(TableCellRenderer headerRenderer)` Sets the `TableCellRenderer` used to draw the `TableColumn`'s header to `headerRenderer`.
`void` `setHeaderValue(Object headerValue)` Sets the `Object` whose string representation will be used as the value for the `headerRenderer`.
`void` `setIdentifier(Object identifier)` Sets the `TableColumn`'s identifier to `anIdentifier`.
`void` `setMaxWidth(int maxWidth)` Sets the `TableColumn`'s maximum width to `maxWidth` or, if `maxWidth` is less than the minimum width, to the minimum width.
`void` `setMinWidth(int minWidth)` Sets the `TableColumn`'s minimum width to `minWidth`, adjusting the new minimum width if necessary to ensure that 0 <= `minWidth` <= `maxWidth`.
`void` `setModelIndex(int modelIndex)` Sets the model index for this column.
`void` `setPreferredWidth(int preferredWidth)` Sets this column's preferred width to `preferredWidth`.
`void` `setResizable(boolean isResizable)` Sets whether this column can be resized.
`void` `setWidth(int width)` This method should not be used to set the widths of columns in the `JTable`, use `setPreferredWidth` instead.
`void` `sizeWidthToFit()` Resizes the `TableColumn` to fit the width of its header cell.

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

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

### Field Detail

#### COLUMN_WIDTH_PROPERTY

    public static final String COLUMN_WIDTH_PROPERTY

Obsolete as of Java 2 platform v1.3. Please use string literals to identify properties.

See Also:
  Constant Field Values

#### HEADER_VALUE_PROPERTY

    public static final String HEADER_VALUE_PROPERTY

Obsolete as of Java 2 platform v1.3. Please use string literals to identify properties.

See Also:
  Constant Field Values

#### HEADER_RENDERER_PROPERTY

    public static final String HEADER_RENDERER_PROPERTY

Obsolete as of Java 2 platform v1.3. Please use string literals to identify properties.

See Also:
  Constant Field Values

#### CELL_RENDERER_PROPERTY

    public static final String CELL_RENDERER_PROPERTY

Obsolete as of Java 2 platform v1.3. Please use string literals to identify properties.

See Also:
  Constant Field Values

#### modelIndex

    protected int modelIndex

The index of the column in the model which is to be displayed by this `TableColumn`. As columns are moved around in the view `modelIndex` remains constant.

#### identifier

    protected Object identifier

This object is not used internally by the drawing machinery of the `JTable`; identifiers may be set in the `TableColumn` as as an optional way to tag and locate table columns. The table package does not modify or invoke any methods in these identifier objects other than the `equals` method which is used in the `getColumnIndex()` method in the `DefaultTableColumnModel`.

#### width

    protected int width

The width of the column.

#### minWidth

    protected int minWidth

The minimum width of the column.

#### maxWidth

    protected int maxWidth

The maximum width of the column.

#### headerRenderer

    protected TableCellRenderer headerRenderer

The renderer used to draw the header of the column.

#### headerValue

    protected Object headerValue

The header value of the column.

#### cellRenderer

    protected TableCellRenderer cellRenderer

The renderer used to draw the data cells of the column.

#### cellEditor

    protected TableCellEditor cellEditor

The editor used to edit the data cells of the column.

#### isResizable

    protected boolean isResizable

If true, the user is allowed to resize the column; the default is true.

#### resizedPostingDisableCount

    @Deprecated
    protected transient int resizedPostingDisableCount

Deprecated. as of Java 2 platform v1.3
This field was not used in previous releases and there are currently no plans to support it in the future.

### Constructor Detail

#### TableColumn

    public TableColumn()

Cover method, using a default model index of 0, default width of 75, a `null` renderer and a `null` editor. This method is intended for serialization.

See Also:
  `TableColumn(int, int, TableCellRenderer, TableCellEditor)`

#### TableColumn

    public TableColumn(int modelIndex)

Cover method, using a default width of 75, a `null` renderer and a `null` editor.

See Also:
  `TableColumn(int, int, TableCellRenderer, TableCellEditor)`

#### TableColumn

    public TableColumn(int modelIndex,
               int width)

Cover method, using a `null` renderer and a `null` editor.

See Also:
  `TableColumn(int, int, TableCellRenderer, TableCellEditor)`

#### TableColumn

    public TableColumn(int modelIndex,
               int width,
               TableCellRenderer cellRenderer,
               TableCellEditor cellEditor)

Creates and initializes an instance of `TableColumn` with the specified model index, width, cell renderer, and cell editor; all `TableColumn` constructors delegate to this one. The value of `width` is used for both the initial and preferred width; if `width` is negative, they're set to 0. The minimum width is set to 15 unless the initial width is less, in which case the minimum width is set to the initial width.

When the `cellRenderer` or `cellEditor` parameter is `null`, a default value provided by the `JTable` `getDefaultRenderer` or `getDefaultEditor` method, respectively, is used to provide defaults based on the type of the data in this column. This column-centric rendering strategy can be circumvented by overriding the `getCellRenderer` methods in `JTable`.

Parameters:
  `modelIndex` - the index of the column in the model that supplies the data for this column in the table; the model index remains the same even when columns are reordered in the view
  `width` - this column's preferred width and initial width
  `cellRenderer` - the object used to render values in this column
  `cellEditor` - the object used to edit values in this column
See Also:
  `getMinWidth()`, `JTable.getDefaultRenderer(Class)`, `JTable.getDefaultEditor(Class)`, `JTable.getCellRenderer(int, int)`, `JTable.getCellEditor(int, int)`

### Method Detail

#### setModelIndex

    public void setModelIndex(int modelIndex)

Sets the model index for this column. The model index is the index of the column in the model that will be displayed by this `TableColumn`. As the `TableColumn` is moved around in the view the model index remains constant.

Parameters:
  `modelIndex` - the new modelIndex

#### getModelIndex

    public int getModelIndex()

Returns the model index for this column.

Returns:
  the `modelIndex` property

#### setIdentifier

    public void setIdentifier(Object identifier)

Sets the `TableColumn`'s identifier to `anIdentifier`.

Note: identifiers are not used by the `JTable`, they are purely a convenience for the external tagging and location of columns.

Parameters:
  `identifier` - an identifier for this column
See Also:
  `getIdentifier()`

#### getIdentifier

    public Object getIdentifier()

Returns the `identifier` object for this column. Note identifiers are not used by `JTable`, they are purely a convenience for external use. If the `identifier` is `null`, `getIdentifier()` returns `getHeaderValue` as a default.

Returns:
  the `identifier` property
See Also:
  `setIdentifier(java.lang.Object)`

#### setHeaderValue

    public void setHeaderValue(Object headerValue)

Sets the `Object` whose string representation will be used as the value for the `headerRenderer`. When the `TableColumn` is created, the default `headerValue` is `null`.

Parameters:
  `headerValue` - the new headerValue
See Also:
  `getHeaderValue()`

#### getHeaderValue

    public Object getHeaderValue()

Returns the `Object` used as the value for the header renderer.

Returns:
  the `headerValue` property
See Also:
  `setHeaderValue(java.lang.Object)`

#### setHeaderRenderer

    public void setHeaderRenderer(TableCellRenderer headerRenderer)

Sets the `TableCellRenderer` used to draw the `TableColumn`'s header to `headerRenderer`.

It is the header renderers responsibility to render the sorting indicator. If you are using sorting and specify a renderer your renderer must render the sorting indication.

Parameters:
  `headerRenderer` - the new headerRenderer
See Also:
  `getHeaderRenderer()`

#### getHeaderRenderer

    public TableCellRenderer getHeaderRenderer()

Returns the `TableCellRenderer` used to draw the header of the `TableColumn`. When the `headerRenderer` is `null`, the `JTableHeader` uses its `defaultRenderer`. The default value for a `headerRenderer` is `null`.

Returns:
  the `headerRenderer` property
See Also:
  `setHeaderRenderer(javax.swing.table.TableCellRenderer)`, `setHeaderValue(java.lang.Object)`, `JTableHeader.getDefaultRenderer()`

#### setCellRenderer

    public void setCellRenderer(TableCellRenderer cellRenderer)

Sets the `TableCellRenderer` used by `JTable` to draw individual values for this column.

Parameters:
  `cellRenderer` - the new cellRenderer
See Also:
  `getCellRenderer()`

#### getCellRenderer

    public TableCellRenderer getCellRenderer()

Returns the `TableCellRenderer` used by the `JTable` to draw values for this column. The `cellRenderer` of the column not only controls the visual look for the column, but is also used to interpret the value object supplied by the `TableModel`. When the `cellRenderer` is `null`, the `JTable` uses a default renderer based on the class of the cells in that column. The default value for a `cellRenderer` is `null`.

Returns:
  the `cellRenderer` property
See Also:
  `setCellRenderer(javax.swing.table.TableCellRenderer)`, `JTable.setDefaultRenderer(java.lang.Class<?>, javax.swing.table.TableCellRenderer)`

#### setCellEditor

    public void setCellEditor(TableCellEditor cellEditor)

Sets the editor to used by when a cell in this column is edited.

Parameters:
  `cellEditor` - the new cellEditor
See Also:
  `getCellEditor()`

#### getCellEditor

    public TableCellEditor getCellEditor()

Returns the `TableCellEditor` used by the `JTable` to edit values for this column. When the `cellEditor` is `null`, the `JTable` uses a default editor based on the class of the cells in that column. The default value for a `cellEditor` is `null`.

Returns:
  the `cellEditor` property
See Also:
  `setCellEditor(javax.swing.table.TableCellEditor)`, `JTable.setDefaultEditor(java.lang.Class<?>, javax.swing.table.TableCellEditor)`

#### setWidth

    public void setWidth(int width)

This method should not be used to set the widths of columns in the `JTable`, use `setPreferredWidth` instead. Like a layout manager in the AWT, the `JTable` adjusts a column's width automatically whenever the table itself changes size, or a column's preferred width is changed. Setting widths programmatically therefore has no long term effect.

This method sets this column's width to `width`. If `width` exceeds the minimum or maximum width, it is adjusted to the appropriate limiting value.

Parameters:
  `width` - the new width
See Also:
  `getWidth()`, `setMinWidth(int)`, `setMaxWidth(int)`, `setPreferredWidth(int)`, `JTable.doLayout()`

#### getWidth

    public int getWidth()

Returns the width of the `TableColumn`. The default width is 75.

Returns:
  the `width` property
See Also:
  `setWidth(int)`

#### setPreferredWidth

    public void setPreferredWidth(int preferredWidth)

Sets this column's preferred width to `preferredWidth`. If `preferredWidth` exceeds the minimum or maximum width, it is adjusted to the appropriate limiting value.

For details on how the widths of columns in the `JTable` (and `JTableHeader`) are calculated from the `preferredWidth`, see the `doLayout` method in `JTable`.

Parameters:
  `preferredWidth` - the new preferred width
See Also:
  `getPreferredWidth()`, `JTable.doLayout()`

#### getPreferredWidth

    public int getPreferredWidth()

Returns the preferred width of the `TableColumn`. The default preferred width is 75.

Returns:
  the `preferredWidth` property
See Also:
  `setPreferredWidth(int)`

#### setMinWidth

    public void setMinWidth(int minWidth)

Sets the `TableColumn`'s minimum width to `minWidth`, adjusting the new minimum width if necessary to ensure that 0 <= `minWidth` <= `maxWidth`. For example, if the `minWidth` argument is negative, this method sets the `minWidth` property to 0.

If the value of the `width` or `preferredWidth` property is less than the new minimum width, this method sets that property to the new minimum width.

Parameters:
  `minWidth` - the new minimum width
See Also:
  `getMinWidth()`, `setPreferredWidth(int)`, `setMaxWidth(int)`

#### getMinWidth

    public int getMinWidth()

Returns the minimum width for the `TableColumn`. The `TableColumn`'s width can't be made less than this either by the user or programmatically.

Returns:
  the `minWidth` property
See Also:
  `setMinWidth(int)`, `TableColumn(int, int, TableCellRenderer, TableCellEditor)`

#### setMaxWidth

    public void setMaxWidth(int maxWidth)

Sets the `TableColumn`'s maximum width to `maxWidth` or, if `maxWidth` is less than the minimum width, to the minimum width.

If the value of the `width` or `preferredWidth` property is more than the new maximum width, this method sets that property to the new maximum width.

Parameters:
  `maxWidth` - the new maximum width
See Also:
  `getMaxWidth()`, `setPreferredWidth(int)`, `setMinWidth(int)`

#### getMaxWidth

    public int getMaxWidth()

Returns the maximum width for the `TableColumn`. The `TableColumn`'s width can't be made larger than this either by the user or programmatically. The default maxWidth is Integer.MAX_VALUE.

Returns:
  the `maxWidth` property
See Also:
  `setMaxWidth(int)`

#### setResizable

    public void setResizable(boolean isResizable)

Sets whether this column can be resized.

Parameters:
  `isResizable` - if true, resizing is allowed; otherwise false
See Also:
  `getResizable()`

#### getResizable

    public boolean getResizable()

Returns true if the user is allowed to resize the `TableColumn`'s width, false otherwise. You can change the width programmatically regardless of this setting. The default is true.

Returns:
  the `isResizable` property
See Also:
  `setResizable(boolean)`

#### sizeWidthToFit

    public void sizeWidthToFit()

Resizes the `TableColumn` to fit the width of its header cell. This method does nothing if the header renderer is `null` (the default case). Otherwise, it sets the minimum, maximum and preferred widths of this column to the widths of the minimum, maximum and preferred sizes of the Component delivered by the header renderer. The transient "width" property of this TableColumn is also set to the preferred width. Note this method is not used internally by the table package.

See Also:
  `setPreferredWidth(int)`

#### disableResizedPosting

    @Deprecated
    public void disableResizedPosting()

Deprecated. as of Java 2 platform v1.3
This field was not used in previous releases and there are currently no plans to support it in the future.

#### enableResizedPosting

    @Deprecated
    public void enableResizedPosting()

Deprecated. as of Java 2 platform v1.3
This field was not used in previous releases and there are currently no plans to support it in the future.

#### addPropertyChangeListener

    public void addPropertyChangeListener(PropertyChangeListener listener)

Adds a `PropertyChangeListener` to the listener list. The listener is registered for all properties.

A `PropertyChangeEvent` will get fired in response to an explicit call to `setFont`, `setBackground`, or `setForeground` on the current component. Note that if the current component is inheriting its foreground, background, or font from its container, then no event will be fired in response to a change in the inherited property.

Parameters:
  `listener` - the listener to be added

#### removePropertyChangeListener

    public void removePropertyChangeListener(PropertyChangeListener listener)

Removes a `PropertyChangeListener` from the listener list. The `PropertyChangeListener` to be removed was registered for all properties.

Parameters:
  `listener` - the listener to be removed

#### getPropertyChangeListeners

    public PropertyChangeListener[] getPropertyChangeListeners()

Returns an array of all the `PropertyChangeListener`s added to this TableColumn with addPropertyChangeListener().

Returns:
  all of the `PropertyChangeListener`s added or an empty array if no listeners have been added
Since:
  1.4

#### createDefaultHeaderRenderer

    protected TableCellRenderer createDefaultHeaderRenderer()

As of Java 2 platform v1.3, this method is not called by the `TableColumn` constructor. Previously this method was used by the `TableColumn` to create a default header renderer. As of Java 2 platform v1.3, the default header renderer is `null`. `JTableHeader` now provides its own shared default renderer, just as the `JTable` does for its cell renderers.

Returns:
  the default header renderer
See Also:
  `JTableHeader.createDefaultRenderer()`

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