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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, resizability, 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 TableColumnModels are unique, therefore we would recommend that the same TableColumn instance not be added more than once to a TableColumnModel. To show TableColumns 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 JavaBeans has been added to the java.beans package. Please see XMLEncoder.

See Also:

Field Summary

Modifier and Type	Field	Description
`static final 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 final String`	`COLUMN_WIDTH_PROPERTY`	Obsolete as of Java 2 platform v1.3.
`static final String`	`HEADER_RENDERER_PROPERTY`	Obsolete as of Java 2 platform v1.3.
`static final 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 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

Constructor	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

Modifier and Type	Method	Description
`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 declared in class java.lang.Object

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

Field Details

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.

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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.

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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.

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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:

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 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 Details

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

public TableColumn(int modelIndex)

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

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

See Also:

TableColumn

public TableColumn(int modelIndex, int width)

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

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

See Also:

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:

Method Details

setModelIndex

@BeanProperty(description="The model index.") 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

@BeanProperty(description="A unique identifier for this column.") 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

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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

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setHeaderValue

@BeanProperty(description="The text to be used by the header renderer.") 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

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getHeaderValue

public Object getHeaderValue()

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

Returns:

the headerValue property

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setHeaderRenderer

@BeanProperty(description="The header renderer.") 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

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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

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setCellRenderer

@BeanProperty(description="The renderer to use for cell values.") public void setCellRenderer(TableCellRenderer cellRenderer)

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

Parameters:

cellRenderer - the new cellRenderer

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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

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setCellEditor

@BeanProperty(description="The editor to use for cell values.") public void setCellEditor(TableCellEditor cellEditor)

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

Parameters:

cellEditor - the new cellEditor

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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

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setWidth

@BeanProperty(description="The width of the column.") 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

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getWidth

public int getWidth()

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

Returns:

the width property

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setPreferredWidth

@BeanProperty(description="The preferred width of the column.") 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

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getPreferredWidth

public int getPreferredWidth()

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

Returns:

the preferredWidth property

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setMinWidth

@BeanProperty(description="The minimum width of the column.") 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

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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

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setMaxWidth

@BeanProperty(description="The maximum width of the column.") 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

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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

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setResizable

@BeanProperty(description="Whether or not this column can be resized.") public void setResizable(boolean isResizable)

Sets whether this column can be resized.

Parameters:

isResizable - if true, resizing is allowed; otherwise false

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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

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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.

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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 bound properties of this class, including the following:

this TableColumn's modelIndex ("modelIndex")
this TableColumn's identifier ("identifier")
this TableColumn's header value ("headerValue")
this TableColumn's header renderer ("headerRenderer")
this TableColumn's cell renderer ("cellRenderer")
this TableColumn's cell editor ("cellEditor")
this TableColumn's width ("width")
this TableColumn's preferred width ("preferredWidth")
this TableColumn's minimum width ("minWidth")
this TableColumn's maximum width ("maxWidth")
this TableColumn's resizable state ("isResizable")

Parameters:

listener - the listener to be added

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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 PropertyChangeListeners added to this TableColumn with addPropertyChangeListener().

Returns:: all of the PropertyChangeListeners 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

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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/table/TableColumn.html