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## javax.swing.table
Class JTableHeader

    java.lang.Object
      java.awt.Component
          java.awt.Container
              javax.swing.JComponent
                  javax.swing.table.JTableHeader

All Implemented Interfaces:
  ImageObserver, MenuContainer, Serializable, EventListener, Accessible, TableColumnModelListener

    public class JTableHeader

extends JComponent
implements TableColumnModelListener, Accessible

This is the object which manages the header of the `JTable`.

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:
  `JTable`

Nested Class Summary
`protected class` | `JTableHeader.AccessibleJTableHeader` This class implements accessibility support for the `JTableHeader` class.

Nested classes/interfaces inherited from class javax.swing.JComponent
`JComponent.AccessibleJComponent`

Nested classes/interfaces inherited from class java.awt.Container
`Container.AccessibleAWTContainer`

Nested classes/interfaces inherited from class java.awt.Component
`Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy`

Field Summary
`protected TableColumnModel` | `columnModel` The `TableColumnModel` of the table header.
`protected TableColumn` | `draggedColumn` The index of the column being dragged.
`protected int` | `draggedDistance` The distance from its original position the column has been dragged.
`protected boolean` | `reorderingAllowed` If true, reordering of columns are allowed by the user; the default is true.
`protected boolean` | `resizingAllowed` If true, resizing of columns are allowed by the user; the default is true.
`protected TableColumn` | `resizingColumn` The index of the column being resized.
`protected JTable` | `table` The table for which this object is the header; the default is `null`.
`protected boolean` | `updateTableInRealTime` Obsolete as of Java 2 platform v1.3.

Fields inherited from class javax.swing.JComponent
`accessibleContext, listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW`

Fields inherited from class java.awt.Component
`BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT`

Fields inherited from interface java.awt.image.ImageObserver
`ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH`

Constructor Summary
`JTableHeader()` Constructs a `JTableHeader` with a default `TableColumnModel`.
`JTableHeader(TableColumnModel cm)` Constructs a `JTableHeader` which is initialized with `cm` as the column model.

Method Summary
`void` | `columnAdded(TableColumnModelEvent e)` Invoked when a column is added to the table column model.
`int` | `columnAtPoint(Point point)` Returns the index of the column that `point` lies in, or -1 if it lies out of bounds.
`void` | `columnMarginChanged(ChangeEvent e)` Invoked when a column is moved due to a margin change.
`void` | `columnMoved(TableColumnModelEvent e)` Invoked when a column is repositioned.
`void` | `columnRemoved(TableColumnModelEvent e)` Invoked when a column is removed from the table column model.
`void` | `columnSelectionChanged(ListSelectionEvent e)` Invoked when the selection model of the `TableColumnModel` is changed.
`protected TableColumnModel` | `createDefaultColumnModel()` Returns the default column model object which is a `DefaultTableColumnModel`.
`protected TableCellRenderer` | `createDefaultRenderer()` Returns a default renderer to be used when no header renderer is defined by a `TableColumn`.
`AccessibleContext` | `getAccessibleContext()` Gets the AccessibleContext associated with this JTableHeader.
`TableColumnModel` | `getColumnModel()` Returns the `TableColumnModel` that contains all column information of this table header.
`TableCellRenderer` | `getDefaultRenderer()` Returns the default renderer used when no `headerRenderer` is defined by a `TableColumn`.
`TableColumn` | `getDraggedColumn()` Returns the the dragged column, if and only if, a drag is in process, otherwise returns `null`.
`int` | `getDraggedDistance()` Returns the column's horizontal distance from its original position, if and only if, a drag is in process.
`Rectangle` | `getHeaderRect(int column)` Returns the rectangle containing the header tile at `column`.
`boolean` | `getReorderingAllowed()` Returns true if the user is allowed to rearrange columns by dragging their headers, false otherwise.
`boolean` | `getResizingAllowed()` Returns true if the user is allowed to resize columns by dragging between their headers, false otherwise.
`TableColumn` | `getResizingColumn()` Returns the resizing column.
`JTable` | `getTable()` Returns the table associated with this header.
`String` | `getToolTipText(MouseEvent event)` Allows the renderer's tips to be used if there is text set.
`TableHeaderUI` | `getUI()` Returns the look and feel (L&F) object that renders this component.
`String` | `getUIClassID()` Returns the suffix used to construct the name of the look and feel (L&F) class used to render this component.
`boolean` | `getUpdateTableInRealTime()` Obsolete as of Java 2 platform v1.3.
`protected void` | `initializeLocalVars()` Initializes the local variables and properties with default values.
`protected String` | `paramString()` Returns a string representation of this `JTableHeader`.
`void` | `resizeAndRepaint()` Sizes the header and marks it as needing display.
`void` | `setColumnModel(TableColumnModel columnModel)` Sets the column model for this table to `newModel` and registers for listener notifications from the new column model.
`void` | `setDefaultRenderer(TableCellRenderer defaultRenderer)` Sets the default renderer to be used when no `headerRenderer` is defined by a `TableColumn`.
`void` | `setDraggedColumn(TableColumn aColumn)` Sets the header's `draggedColumn` to `aColumn`.
`void` | `setDraggedDistance(int distance)` Sets the header's `draggedDistance` to `distance`.
`void` | `setReorderingAllowed(boolean reorderingAllowed)` Sets whether the user can drag column headers to reorder columns.
`void` | `setResizingAllowed(boolean resizingAllowed)` Sets whether the user can resize columns by dragging between headers.
`void` | `setResizingColumn(TableColumn aColumn)` Sets the header's `resizingColumn` to `aColumn`.
`void` | `setTable(JTable table)` Sets the table associated with this header.
`void` | `setUI(TableHeaderUI ui)` Sets the look and feel (L&F) object that renders this component.
`void` | `setUpdateTableInRealTime(boolean flag)` Obsolete as of Java 2 platform v1.3.
`void` | `updateUI()` Notification from the `UIManager` that the look and feel (L&F) has changed.

Methods inherited from class javax.swing.JComponent
`addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBaselineResizeBehavior, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPopupLocation, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setEnabled, setFocusTraversalKeys, setFont, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update`

Methods inherited from class java.awt.Container
`add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusBackward, transferFocusDownCycle, validate, validateTree`

Methods inherited from class java.awt.Component
`action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusUpCycle`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### table

    protected JTable table

  The table for which this object is the header; the default is `null`.

### columnModel

    protected TableColumnModel columnModel

  The `TableColumnModel` of the table header.

### reorderingAllowed

    protected boolean reorderingAllowed

  If true, reordering of columns are allowed by the user; the default is true.

### resizingAllowed

    protected boolean resizingAllowed

  If true, resizing of columns are allowed by the user; the default is true.

### updateTableInRealTime

    protected boolean updateTableInRealTime

  Obsolete as of Java 2 platform v1.3. Real time repaints, in response to column dragging or resizing, are now unconditional.

### resizingColumn

    protected transient TableColumn resizingColumn

  The index of the column being resized. `null` if not resizing.

### draggedColumn

    protected transient TableColumn draggedColumn

  The index of the column being dragged. `null` if not dragging.

### draggedDistance

    protected transient int draggedDistance

  The distance from its original position the column has been dragged.

Constructor Detail

### JTableHeader

    public JTableHeader()

  Constructs a `JTableHeader` with a default `TableColumnModel`.

  See Also:
    `createDefaultColumnModel()`

### JTableHeader

    public JTableHeader(TableColumnModel cm)

  Constructs a `JTableHeader` which is initialized with `cm` as the column model. If `cm` is `null` this method will initialize the table header with a default `TableColumnModel`.

  Parameters:
    `cm` - the column model for the table
  See Also:
    `createDefaultColumnModel()`

Method Detail

### setTable

    public void setTable(JTable table)

  Sets the table associated with this header.

  Parameters:
    `table` - the new table

### getTable

    public JTable getTable()

  Returns the table associated with this header.

  Returns:
    the `table` property

### setReorderingAllowed

    public void setReorderingAllowed(boolean reorderingAllowed)

  Sets whether the user can drag column headers to reorder columns.

  Parameters:
    `reorderingAllowed` - true if the table view should allow reordering; otherwise false
  See Also:
    `getReorderingAllowed()`

### getReorderingAllowed

    public boolean getReorderingAllowed()

  Returns true if the user is allowed to rearrange columns by dragging their headers, false otherwise. The default is true. You can rearrange columns programmatically regardless of this setting.

  Returns:
    the `reorderingAllowed` property
  See Also:
    `setReorderingAllowed(boolean)`

### setResizingAllowed

    public void setResizingAllowed(boolean resizingAllowed)

  Sets whether the user can resize columns by dragging between headers.

  Parameters:
    `resizingAllowed` - true if table view should allow resizing
  See Also:
    `getResizingAllowed()`

### getResizingAllowed

    public boolean getResizingAllowed()

  Returns true if the user is allowed to resize columns by dragging between their headers, false otherwise. The default is true. You can resize columns programmatically regardless of this setting.

  Returns:
    the `resizingAllowed` property
  See Also:
    `setResizingAllowed(boolean)`

### getDraggedColumn

    public TableColumn getDraggedColumn()

  Returns the the dragged column, if and only if, a drag is in process, otherwise returns `null`.

  Returns:
    the dragged column, if a drag is in process, otherwise returns `null`
  See Also:
    `getDraggedDistance()`

### getDraggedDistance

    public int getDraggedDistance()

  Returns the column's horizontal distance from its original position, if and only if, a drag is in process. Otherwise, the the return value is meaningless.

  Returns:
    the column's horizontal distance from its original position, if a drag is in process, otherwise the return value is meaningless
  See Also:
    `getDraggedColumn()`

### getResizingColumn

    public TableColumn getResizingColumn()

  Returns the resizing column. If no column is being resized this method returns `null`.

  Returns:
    the resizing column, if a resize is in process, otherwise returns `null`

### setUpdateTableInRealTime

    public void setUpdateTableInRealTime(boolean flag)

  Obsolete as of Java 2 platform v1.3. Real time repaints, in response to column dragging or resizing, are now unconditional.

### getUpdateTableInRealTime

    public boolean getUpdateTableInRealTime()

  Obsolete as of Java 2 platform v1.3. Real time repaints, in response to column dragging or resizing, are now unconditional.

### setDefaultRenderer

    public void setDefaultRenderer(TableCellRenderer defaultRenderer)

  Sets the default renderer to be used when no `headerRenderer` is defined by a `TableColumn`.

  Parameters:
    `defaultRenderer` - the default renderer
  Since:
    1.3

### getDefaultRenderer

    public TableCellRenderer getDefaultRenderer()

  Returns the default renderer used when no `headerRenderer` is defined by a `TableColumn`.

  Returns:
    the default renderer
  Since:
    1.3

### columnAtPoint

    public int columnAtPoint(Point point)

  Returns the index of the column that `point` lies in, or -1 if it lies out of bounds.

  Returns:
    the index of the column that `point` lies in, or -1 if it lies out of bounds

### getHeaderRect

    public Rectangle getHeaderRect(int column)

  Returns the rectangle containing the header tile at `column`. When the `column` parameter is out of bounds this method uses the same conventions as the `JTable` method `getCellRect`.

  Returns:
    the rectangle containing the header tile at `column`
  See Also:
    `JTable.getCellRect(int, int, boolean)`

### getToolTipText

    public String getToolTipText(MouseEvent event)

  Allows the renderer's tips to be used if there is text set.

  Overrides:
    `getToolTipText` in class `JComponent`
  Parameters:
    `event` - the location of the event identifies the proper renderer and, therefore, the proper tip
  Returns:
    the tool tip for this component

### getUI

    public TableHeaderUI getUI()

  Returns the look and feel (L&F) object that renders this component.

  Returns:
    the `TableHeaderUI` object that renders this component

### setUI

    public void setUI(TableHeaderUI ui)

  Sets the look and feel (L&F) object that renders this component.

  Parameters:
    `ui` - the `TableHeaderUI` L&F object
  See Also:
    `UIDefaults.getUI(javax.swing.JComponent)`

### updateUI

    public void updateUI()

  Notification from the `UIManager` that the look and feel (L&F) has changed. Replaces the current UI object with the latest version from the `UIManager`.

  Overrides:
    `updateUI` in class `JComponent`
  See Also:
    `JComponent.updateUI()`

### getUIClassID

    public String getUIClassID()

  Returns the suffix used to construct the name of the look and feel (L&F) class used to render this component.

  Overrides:
    `getUIClassID` in class `JComponent`
  Returns:
    the string "TableHeaderUI"
  See Also:
    `JComponent.getUIClassID()`, `UIDefaults.getUI(javax.swing.JComponent)`

### setColumnModel

    public void setColumnModel(TableColumnModel columnModel)

  Sets the column model for this table to `newModel` and registers for listener notifications from the new column model.

  Parameters:
    `columnModel` - the new data source for this table
  Throws:
    `IllegalArgumentException` - if `newModel` is `null`
  See Also:
    `getColumnModel()`

### getColumnModel

    public TableColumnModel getColumnModel()

  Returns the `TableColumnModel` that contains all column information of this table header.

  Returns:
    the `columnModel` property
  See Also:
    `setColumnModel(javax.swing.table.TableColumnModel)`

### columnAdded

    public void columnAdded(TableColumnModelEvent e)

  Invoked when a column is added to the table column model.

  Application code will not use these methods explicitly, they are used internally by `JTable`.

  Specified by:
    `columnAdded` in interface `TableColumnModelListener`
  Parameters:
    `e` - the event received
  See Also:
    `TableColumnModelListener`

### columnRemoved

    public void columnRemoved(TableColumnModelEvent e)

  Invoked when a column is removed from the table column model.

  Application code will not use these methods explicitly, they are used internally by `JTable`.

  Specified by:
    `columnRemoved` in interface `TableColumnModelListener`
  Parameters:
    `e` - the event received
  See Also:
    `TableColumnModelListener`

### columnMoved

    public void columnMoved(TableColumnModelEvent e)

  Invoked when a column is repositioned.

  Application code will not use these methods explicitly, they are used internally by `JTable`.

  Specified by:
    `columnMoved` in interface `TableColumnModelListener`
  Parameters:
    `e` - the event received
  See Also:
    `TableColumnModelListener`

### columnMarginChanged

    public void columnMarginChanged(ChangeEvent e)

  Invoked when a column is moved due to a margin change.

  Application code will not use these methods explicitly, they are used internally by `JTable`.

  Specified by:
    `columnMarginChanged` in interface `TableColumnModelListener`
  Parameters:
    `e` - the event received
  See Also:
    `TableColumnModelListener`

### columnSelectionChanged

    public void columnSelectionChanged(ListSelectionEvent e)

  Invoked when the selection model of the `TableColumnModel` is changed. This method currently has no effect (the header is not redrawn).

  Application code will not use these methods explicitly, they are used internally by `JTable`.

  Specified by:
    `columnSelectionChanged` in interface `TableColumnModelListener`
  Parameters:
    `e` - the event received
  See Also:
    `TableColumnModelListener`

### createDefaultColumnModel

    protected TableColumnModel createDefaultColumnModel()

  Returns the default column model object which is a `DefaultTableColumnModel`. A subclass can override this method to return a different column model object

  Returns:
    the default column model object

### createDefaultRenderer

    protected TableCellRenderer createDefaultRenderer()

  Returns a default renderer to be used when no header renderer is defined by a `TableColumn`.

  Returns:
    the default table column renderer
  Since:
    1.3

### initializeLocalVars

    protected void initializeLocalVars()

  Initializes the local variables and properties with default values. Used by the constructor methods.

### resizeAndRepaint

    public void resizeAndRepaint()

  Sizes the header and marks it as needing display. Equivalent to `revalidate` followed by `repaint`.

### setDraggedColumn

    public void setDraggedColumn(TableColumn aColumn)

  Sets the header's `draggedColumn` to `aColumn`.

  Application code will not use this method explicitly, it is used internally by the column dragging mechanism.

  Parameters:
    `aColumn` - the column being dragged, or `null` if no column is being dragged

### setDraggedDistance

    public void setDraggedDistance(int distance)

  Sets the header's `draggedDistance` to `distance`.

  Parameters:
    `distance` - the distance dragged

### setResizingColumn

    public void setResizingColumn(TableColumn aColumn)

  Sets the header's `resizingColumn` to `aColumn`.

  Application code will not use this method explicitly, it is used internally by the column sizing mechanism.

  Parameters:
    `aColumn` - the column being resized, or `null` if no column is being resized

### paramString

    protected String paramString()

  Returns a string representation of this `JTableHeader`. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be `null`.

  Overriding `paramString` to provide information about the specific new aspects of the JFC components.

  Overrides:
    `paramString` in class `JComponent`
  Returns:
    a string representation of this `JTableHeader`

### getAccessibleContext

    public AccessibleContext getAccessibleContext()

  Gets the AccessibleContext associated with this JTableHeader. For JTableHeaders, the AccessibleContext takes the form of an AccessibleJTableHeader. A new AccessibleJTableHeader instance is created if necessary.

  Specified by:
    `getAccessibleContext` in interface `Accessible`
  Overrides:
    `getAccessibleContext` in class `JComponent`
  Returns:
    an AccessibleJTableHeader that serves as the AccessibleContext of this JTableHeader

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