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## org.jfree.chart.axis
Class CategoryAxis

    java.lang.Object
      org.jfree.chart.axis.Axis
          org.jfree.chart.axis.CategoryAxis

All Implemented Interfaces:
  java.io.Serializable, java.lang.Cloneable

Direct Known Subclasses:
  CategoryAxis3D, ExtendedCategoryAxis, SubCategoryAxis

    public class CategoryAxis

extends Axis
implements java.lang.Cloneable, java.io.Serializable

An axis that displays categories.

See Also:
  Serialized Form

Field Summary
`static double` | `DEFAULT_AXIS_MARGIN` The default margin for the axis (used for both lower and upper margins).
`static double` | `DEFAULT_CATEGORY_MARGIN` The default margin between categories (a percentage of the overall axis length).

Fields inherited from class org.jfree.chart.axis.Axis
`DEFAULT_AXIS_LABEL_FONT, DEFAULT_AXIS_LABEL_INSETS, DEFAULT_AXIS_LABEL_PAINT, DEFAULT_AXIS_LINE_PAINT, DEFAULT_AXIS_LINE_STROKE, DEFAULT_AXIS_VISIBLE, DEFAULT_TICK_LABEL_FONT, DEFAULT_TICK_LABEL_INSETS, DEFAULT_TICK_LABEL_PAINT, DEFAULT_TICK_LABELS_VISIBLE, DEFAULT_TICK_MARK_INSIDE_LENGTH, DEFAULT_TICK_MARK_OUTSIDE_LENGTH, DEFAULT_TICK_MARK_PAINT, DEFAULT_TICK_MARK_STROKE, DEFAULT_TICK_MARKS_VISIBLE`

Constructor Summary
`CategoryAxis()` Creates a new category axis with no label.
`CategoryAxis(java.lang.String label)` Constructs a category axis, using default values where necessary.

Method Summary
`void` | `addCategoryLabelToolTip(java.lang.Comparable category, java.lang.String tooltip)` Adds a tooltip to the specified category and sends an `AxisChangeEvent` to all registered listeners.
`protected double` | `calculateCategoryGapSize(int categoryCount, java.awt.geom.Rectangle2D area, org.jfree.ui.RectangleEdge edge)` Calculates the size (width or height, depending on the location of the axis) of a category gap.
`protected double` | `calculateCategorySize(int categoryCount, java.awt.geom.Rectangle2D area, org.jfree.ui.RectangleEdge edge)` Calculates the size (width or height, depending on the location of the axis) of a category.
`protected double` | `calculateTextBlockHeight(org.jfree.text.TextBlock block, CategoryLabelPosition position, java.awt.Graphics2D g2)` A utility method for determining the height of a text block.
`protected double` | `calculateTextBlockWidth(org.jfree.text.TextBlock block, CategoryLabelPosition position, java.awt.Graphics2D g2)` A utility method for determining the width of a text block.
`void` | `clearCategoryLabelToolTips()` Clears the category label tooltips and sends an `AxisChangeEvent` to all registered listeners.
`java.lang.Object` | `clone()` Creates a clone of the axis.
`void` | `configure()` Configures the axis against the current plot.
`protected org.jfree.text.TextBlock` | `createLabel(java.lang.Comparable category, float width, org.jfree.ui.RectangleEdge edge, java.awt.Graphics2D g2)` Creates a label.
`AxisState` | `draw(java.awt.Graphics2D g2, double cursor, java.awt.geom.Rectangle2D plotArea, java.awt.geom.Rectangle2D dataArea, org.jfree.ui.RectangleEdge edge, PlotRenderingInfo plotState)` Draws the axis on a Java 2D graphics device (such as the screen or a printer).
`protected AxisState` | `drawCategoryLabels(java.awt.Graphics2D g2, java.awt.geom.Rectangle2D plotArea, java.awt.geom.Rectangle2D dataArea, org.jfree.ui.RectangleEdge edge, AxisState state, PlotRenderingInfo plotState)` Draws the category labels and returns the updated axis state.
`protected AxisState` | `drawCategoryLabels(java.awt.Graphics2D g2, java.awt.geom.Rectangle2D dataArea, org.jfree.ui.RectangleEdge edge, AxisState state, PlotRenderingInfo plotState)` Deprecated. Use `drawCategoryLabels(Graphics2D, Rectangle2D, Rectangle2D, RectangleEdge, AxisState, PlotRenderingInfo)`.
`boolean` | `equals(java.lang.Object obj)` Tests this axis for equality with an arbitrary object.
`double` | `getCategoryEnd(int category, int categoryCount, java.awt.geom.Rectangle2D area, org.jfree.ui.RectangleEdge edge)` Returns the end coordinate for the specified category.
`double` | `getCategoryJava2DCoordinate(CategoryAnchor anchor, int category, int categoryCount, java.awt.geom.Rectangle2D area, org.jfree.ui.RectangleEdge edge)` Returns the Java 2D coordinate for a category.
`int` | `getCategoryLabelPositionOffset()` Returns the offset between the axis and the category labels (before label positioning is taken into account).
`CategoryLabelPositions` | `getCategoryLabelPositions()` Returns the category label position specification (this contains label positioning info for all four possible axis locations).
`java.lang.String` | `getCategoryLabelToolTip(java.lang.Comparable category)` Returns the tool tip text for the label belonging to the specified category.
`double` | `getCategoryMargin()` Returns the category margin.
`double` | `getCategoryMiddle(int category, int categoryCount, java.awt.geom.Rectangle2D area, org.jfree.ui.RectangleEdge edge)` Returns the middle coordinate for the specified category.
`double` | `getCategoryStart(int category, int categoryCount, java.awt.geom.Rectangle2D area, org.jfree.ui.RectangleEdge edge)` Returns the starting coordinate for the specified category.
`double` | `getLowerMargin()` Returns the lower margin for the axis.
`int` | `getMaximumCategoryLabelLines()` Returns the maximum number of lines to use for each category label.
`float` | `getMaximumCategoryLabelWidthRatio()` Returns the category label width ratio.
`java.awt.Font` | `getTickLabelFont(java.lang.Comparable category)` Returns the font for the tick label for the given category.
`java.awt.Paint` | `getTickLabelPaint(java.lang.Comparable category)` Returns the paint for the tick label for the given category.
`double` | `getUpperMargin()` Returns the upper margin for the axis.
`int` | `hashCode()` Returns a hash code for this object.
`java.util.List` | `refreshTicks(java.awt.Graphics2D g2, AxisState state, java.awt.geom.Rectangle2D dataArea, org.jfree.ui.RectangleEdge edge)` Creates a temporary list of ticks that can be used when drawing the axis.
`void` | `removeCategoryLabelToolTip(java.lang.Comparable category)` Removes the tooltip for the specified category and sends an `AxisChangeEvent` to all registered listeners.
`AxisSpace` | `reserveSpace(java.awt.Graphics2D g2, Plot plot, java.awt.geom.Rectangle2D plotArea, org.jfree.ui.RectangleEdge edge, AxisSpace space)` Estimates the space required for the axis, given a specific drawing area.
`void` | `setCategoryLabelPositionOffset(int offset)` Sets the offset between the axis and the category labels (before label positioning is taken into account).
`void` | `setCategoryLabelPositions(CategoryLabelPositions positions)` Sets the category label position specification for the axis and sends an `AxisChangeEvent` to all registered listeners.
`void` | `setCategoryMargin(double margin)` Sets the category margin and sends an `AxisChangeEvent` to all registered listeners.
`void` | `setLowerMargin(double margin)` Sets the lower margin for the axis and sends an `AxisChangeEvent` to all registered listeners.
`void` | `setMaximumCategoryLabelLines(int lines)` Sets the maximum number of lines to use for each category label and sends an `AxisChangeEvent` to all registered listeners.
`void` | `setMaximumCategoryLabelWidthRatio(float ratio)` Sets the maximum category label width ratio and sends an `AxisChangeEvent` to all registered listeners.
`void` | `setTickLabelFont(java.lang.Comparable category, java.awt.Font font)` Sets the font for the tick label for the specified category and sends an `AxisChangeEvent` to all registered listeners.
`void` | `setTickLabelPaint(java.lang.Comparable category, java.awt.Paint paint)` Sets the paint for the tick label for the specified category and sends an `AxisChangeEvent` to all registered listeners.
`void` | `setUpperMargin(double margin)` Sets the upper margin for the axis and sends an `AxisChangeEvent` to all registered listeners.

Methods inherited from class org.jfree.chart.axis.Axis
`addChangeListener, drawAxisLine, drawLabel, getAxisLinePaint, getAxisLineStroke, getFixedDimension, getLabel, getLabelAngle, getLabelEnclosure, getLabelFont, getLabelInsets, getLabelPaint, getPlot, getTickLabelFont, getTickLabelInsets, getTickLabelPaint, getTickMarkInsideLength, getTickMarkOutsideLength, getTickMarkPaint, getTickMarkStroke, hasListener, isAxisLineVisible, isTickLabelsVisible, isTickMarksVisible, isVisible, notifyListeners, removeChangeListener, setAxisLinePaint, setAxisLineStroke, setAxisLineVisible, setFixedDimension, setLabel, setLabelAngle, setLabelFont, setLabelInsets, setLabelPaint, setPlot, setTickLabelFont, setTickLabelInsets, setTickLabelPaint, setTickLabelsVisible, setTickMarkInsideLength, setTickMarkOutsideLength, setTickMarkPaint, setTickMarkStroke, setTickMarksVisible, setVisible`

Methods inherited from class java.lang.Object
`finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### DEFAULT_AXIS_MARGIN

    public static final double DEFAULT_AXIS_MARGIN

  The default margin for the axis (used for both lower and upper margins).

  See Also:
    Constant Field Values

### DEFAULT_CATEGORY_MARGIN

    public static final double DEFAULT_CATEGORY_MARGIN

  The default margin between categories (a percentage of the overall axis length).

  See Also:
    Constant Field Values

Constructor Detail

### CategoryAxis

    public CategoryAxis()

  Creates a new category axis with no label.

### CategoryAxis

    public CategoryAxis(java.lang.String label)

  Constructs a category axis, using default values where necessary.

  Parameters:
    `label` - the axis label (`null` permitted).

Method Detail

### getLowerMargin

    public double getLowerMargin()

  Returns the lower margin for the axis.

  Returns:
    The margin.
  See Also:
    `getUpperMargin()`, `setLowerMargin(double)`

### setLowerMargin

    public void setLowerMargin(double margin)

  Sets the lower margin for the axis and sends an `AxisChangeEvent` to all registered listeners.

  Parameters:
    `margin` - the margin as a percentage of the axis length (for example, 0.05 is five percent).
  See Also:
    `getLowerMargin()`

### getUpperMargin

    public double getUpperMargin()

  Returns the upper margin for the axis.

  Returns:
    The margin.
  See Also:
    `getLowerMargin()`, `setUpperMargin(double)`

### setUpperMargin

    public void setUpperMargin(double margin)

  Sets the upper margin for the axis and sends an `AxisChangeEvent` to all registered listeners.

  Parameters:
    `margin` - the margin as a percentage of the axis length (for example, 0.05 is five percent).
  See Also:
    `getUpperMargin()`

### getCategoryMargin

    public double getCategoryMargin()

  Returns the category margin.

  Returns:
    The margin.
  See Also:
    `setCategoryMargin(double)`

### setCategoryMargin

    public void setCategoryMargin(double margin)

  Sets the category margin and sends an `AxisChangeEvent` to all registered listeners. The overall category margin is distributed over N-1 gaps, where N is the number of categories on the axis.

  Parameters:
    `margin` - the margin as a percentage of the axis length (for example, 0.05 is five percent).
  See Also:
    `getCategoryMargin()`

### getMaximumCategoryLabelLines

    public int getMaximumCategoryLabelLines()

  Returns the maximum number of lines to use for each category label.

  Returns:
    The maximum number of lines.
  See Also:
    `setMaximumCategoryLabelLines(int)`

### setMaximumCategoryLabelLines

    public void setMaximumCategoryLabelLines(int lines)

  Sets the maximum number of lines to use for each category label and sends an `AxisChangeEvent` to all registered listeners.

  Parameters:
    `lines` - the maximum number of lines.
  See Also:
    `getMaximumCategoryLabelLines()`

### getMaximumCategoryLabelWidthRatio

    public float getMaximumCategoryLabelWidthRatio()

  Returns the category label width ratio.

  Returns:
    The ratio.
  See Also:
    `setMaximumCategoryLabelWidthRatio(float)`

### setMaximumCategoryLabelWidthRatio

    public void setMaximumCategoryLabelWidthRatio(float ratio)

  Sets the maximum category label width ratio and sends an `AxisChangeEvent` to all registered listeners.

  Parameters:
    `ratio` - the ratio.
  See Also:
    `getMaximumCategoryLabelWidthRatio()`

### getCategoryLabelPositionOffset

    public int getCategoryLabelPositionOffset()

  Returns the offset between the axis and the category labels (before label positioning is taken into account).

  Returns:
    The offset (in Java2D units).
  See Also:
    `setCategoryLabelPositionOffset(int)`

### setCategoryLabelPositionOffset

    public void setCategoryLabelPositionOffset(int offset)

  Sets the offset between the axis and the category labels (before label positioning is taken into account).

  Parameters:
    `offset` - the offset (in Java2D units).
  See Also:
    `getCategoryLabelPositionOffset()`

### getCategoryLabelPositions

    public CategoryLabelPositions getCategoryLabelPositions()

  Returns the category label position specification (this contains label positioning info for all four possible axis locations).

  Returns:
    The positions (never `null`).
  See Also:
    `setCategoryLabelPositions(CategoryLabelPositions)`

### setCategoryLabelPositions

    public void setCategoryLabelPositions(CategoryLabelPositions positions)

  Sets the category label position specification for the axis and sends an `AxisChangeEvent` to all registered listeners.

  Parameters:
    `positions` - the positions (`null` not permitted).
  See Also:
    `getCategoryLabelPositions()`

### getTickLabelFont

    public java.awt.Font getTickLabelFont(java.lang.Comparable category)

  Returns the font for the tick label for the given category.

  Parameters:
    `category` - the category (`null` not permitted).
  Returns:
    The font (never `null`).
  See Also:
    `setTickLabelFont(Comparable, Font)`

### setTickLabelFont

    public void setTickLabelFont(java.lang.Comparable category,
                                 java.awt.Font font)

  Sets the font for the tick label for the specified category and sends an `AxisChangeEvent` to all registered listeners.

  Parameters:
    `category` - the category (`null` not permitted).
    `font` - the font (`null` permitted).
  See Also:
    `getTickLabelFont(Comparable)`

### getTickLabelPaint

    public java.awt.Paint getTickLabelPaint(java.lang.Comparable category)

  Returns the paint for the tick label for the given category.

  Parameters:
    `category` - the category (`null` not permitted).
  Returns:
    The paint (never `null`).
  See Also:
    `Axis.setTickLabelPaint(Paint)`

### setTickLabelPaint

    public void setTickLabelPaint(java.lang.Comparable category,
                                  java.awt.Paint paint)

  Sets the paint for the tick label for the specified category and sends an `AxisChangeEvent` to all registered listeners.

  Parameters:
    `category` - the category (`null` not permitted).
    `paint` - the paint (`null` permitted).
  See Also:
    `getTickLabelPaint(Comparable)`

### addCategoryLabelToolTip

    public void addCategoryLabelToolTip(java.lang.Comparable category,
                                        java.lang.String tooltip)

  Adds a tooltip to the specified category and sends an `AxisChangeEvent` to all registered listeners.

  Parameters:
    `category` - the category (`null`not permitted).``
    `tooltip` - the tooltip text (`null` permitted).
  See Also:
    `removeCategoryLabelToolTip(Comparable)`

### getCategoryLabelToolTip

    public java.lang.String getCategoryLabelToolTip(java.lang.Comparable category)

  Returns the tool tip text for the label belonging to the specified category.

  Parameters:
    `category` - the category (`null` not permitted).
  Returns:
    The tool tip text (possibly `null`).
  See Also:
    `addCategoryLabelToolTip(Comparable, String)`, `removeCategoryLabelToolTip(Comparable)`

### removeCategoryLabelToolTip

    public void removeCategoryLabelToolTip(java.lang.Comparable category)

  Removes the tooltip for the specified category and sends an `AxisChangeEvent` to all registered listeners.

  Parameters:
    `category` - the category (`null`not permitted).``
  See Also:
    `addCategoryLabelToolTip(Comparable, String)`, `clearCategoryLabelToolTips()`

### clearCategoryLabelToolTips

    public void clearCategoryLabelToolTips()

  Clears the category label tooltips and sends an `AxisChangeEvent` to all registered listeners.

  See Also:
    `addCategoryLabelToolTip(Comparable, String)`, `removeCategoryLabelToolTip(Comparable)`

### getCategoryJava2DCoordinate

    public double getCategoryJava2DCoordinate(CategoryAnchor anchor,
                                              int category,
                                              int categoryCount,
                                              java.awt.geom.Rectangle2D area,
                                              org.jfree.ui.RectangleEdge edge)

  Returns the Java 2D coordinate for a category.

  Parameters:
    `anchor` - the anchor point.
    `category` - the category index.
    `categoryCount` - the category count.
    `area` - the data area.
    `edge` - the location of the axis.
  Returns:
    The coordinate.

### getCategoryStart

    public double getCategoryStart(int category,
                                   int categoryCount,
                                   java.awt.geom.Rectangle2D area,
                                   org.jfree.ui.RectangleEdge edge)

  Returns the starting coordinate for the specified category.

  Parameters:
    `category` - the category.
    `categoryCount` - the number of categories.
    `area` - the data area.
    `edge` - the axis location.
  Returns:
    The coordinate.
  See Also:
    `getCategoryMiddle(int, int, Rectangle2D, RectangleEdge)`, `getCategoryEnd(int, int, Rectangle2D, RectangleEdge)`

### getCategoryMiddle

    public double getCategoryMiddle(int category,
                                    int categoryCount,
                                    java.awt.geom.Rectangle2D area,
                                    org.jfree.ui.RectangleEdge edge)

  Returns the middle coordinate for the specified category.

  Parameters:
    `category` - the category.
    `categoryCount` - the number of categories.
    `area` - the data area.
    `edge` - the axis location.
  Returns:
    The coordinate.
  See Also:
    `getCategoryStart(int, int, Rectangle2D, RectangleEdge)`, `getCategoryEnd(int, int, Rectangle2D, RectangleEdge)`

### getCategoryEnd

    public double getCategoryEnd(int category,
                                 int categoryCount,
                                 java.awt.geom.Rectangle2D area,
                                 org.jfree.ui.RectangleEdge edge)

  Returns the end coordinate for the specified category.

  Parameters:
    `category` - the category.
    `categoryCount` - the number of categories.
    `area` - the data area.
    `edge` - the axis location.
  Returns:
    The coordinate.
  See Also:
    `getCategoryStart(int, int, Rectangle2D, RectangleEdge)`, `getCategoryMiddle(int, int, Rectangle2D, RectangleEdge)`

### calculateCategorySize

    protected double calculateCategorySize(int categoryCount,
                                           java.awt.geom.Rectangle2D area,
                                           org.jfree.ui.RectangleEdge edge)

  Calculates the size (width or height, depending on the location of the axis) of a category.

  Parameters:
    `categoryCount` - the number of categories.
    `area` - the area within which the categories will be drawn.
    `edge` - the axis location.
  Returns:
    The category size.

### calculateCategoryGapSize

    protected double calculateCategoryGapSize(int categoryCount,
                                              java.awt.geom.Rectangle2D area,
                                              org.jfree.ui.RectangleEdge edge)

  Calculates the size (width or height, depending on the location of the axis) of a category gap.

  Parameters:
    `categoryCount` - the number of categories.
    `area` - the area within which the categories will be drawn.
    `edge` - the axis location.
  Returns:
    The category gap width.

### reserveSpace

    public AxisSpace reserveSpace(java.awt.Graphics2D g2,
                                  Plot plot,
                                  java.awt.geom.Rectangle2D plotArea,
                                  org.jfree.ui.RectangleEdge edge,
                                  AxisSpace space)

  Estimates the space required for the axis, given a specific drawing area.

  Specified by:
    `reserveSpace` in class `Axis`
  Parameters:
    `g2` - the graphics device (used to obtain font information).
    `plot` - the plot that the axis belongs to.
    `plotArea` - the area within which the axis should be drawn.
    `edge` - the axis location (top or bottom).
    `space` - the space already reserved.
  Returns:
    The space required to draw the axis.

### configure

    public void configure()

  Configures the axis against the current plot.

  Specified by:
    `configure` in class `Axis`

### draw

    public AxisState draw(java.awt.Graphics2D g2,
                          double cursor,
                          java.awt.geom.Rectangle2D plotArea,
                          java.awt.geom.Rectangle2D dataArea,
                          org.jfree.ui.RectangleEdge edge,
                          PlotRenderingInfo plotState)

  Draws the axis on a Java 2D graphics device (such as the screen or a printer).

  Specified by:
    `draw` in class `Axis`
  Parameters:
    `g2` - the graphics device (`null` not permitted).
    `cursor` - the cursor location.
    `plotArea` - the area within which the axis should be drawn (`null` not permitted).
    `dataArea` - the area within which the plot is being drawn (`null` not permitted).
    `edge` - the location of the axis (`null` not permitted).
    `plotState` - collects information about the plot (`null` permitted).
  Returns:
    The axis state (never `null`).

### drawCategoryLabels

    protected AxisState drawCategoryLabels(java.awt.Graphics2D g2,
                                           java.awt.geom.Rectangle2D dataArea,
                                           org.jfree.ui.RectangleEdge edge,
                                           AxisState state,
                                           PlotRenderingInfo plotState)

  Deprecated. Use `drawCategoryLabels(Graphics2D, Rectangle2D, Rectangle2D, RectangleEdge, AxisState, PlotRenderingInfo)`.

  Draws the category labels and returns the updated axis state.

  Parameters:
    `g2` - the graphics device (`null` not permitted).
    `dataArea` - the area inside the axes (`null` not permitted).
    `edge` - the axis location (`null` not permitted).
    `state` - the axis state (`null` not permitted).
    `plotState` - collects information about the plot (`null` permitted).
  Returns:
    The updated axis state (never `null`).

### drawCategoryLabels

    protected AxisState drawCategoryLabels(java.awt.Graphics2D g2,
                                           java.awt.geom.Rectangle2D plotArea,
                                           java.awt.geom.Rectangle2D dataArea,
                                           org.jfree.ui.RectangleEdge edge,
                                           AxisState state,
                                           PlotRenderingInfo plotState)

  Draws the category labels and returns the updated axis state.

  Parameters:
    `g2` - the graphics device (`null` not permitted).
    `plotArea` - the plot area (`null` not permitted).
    `dataArea` - the area inside the axes (`null` not permitted).
    `edge` - the axis location (`null` not permitted).
    `state` - the axis state (`null` not permitted).
    `plotState` - collects information about the plot (`null` permitted).
  Returns:
    The updated axis state (never `null`).

### refreshTicks

    public java.util.List refreshTicks(java.awt.Graphics2D g2,
                                       AxisState state,
                                       java.awt.geom.Rectangle2D dataArea,
                                       org.jfree.ui.RectangleEdge edge)

  Creates a temporary list of ticks that can be used when drawing the axis.

  Specified by:
    `refreshTicks` in class `Axis`
  Parameters:
    `g2` - the graphics device (used to get font measurements).
    `state` - the axis state.
    `dataArea` - the area inside the axes.
    `edge` - the location of the axis.
  Returns:
    A list of ticks.

### createLabel

    protected org.jfree.text.TextBlock createLabel(java.lang.Comparable category,
                                                   float width,
                                                   org.jfree.ui.RectangleEdge edge,
                                                   java.awt.Graphics2D g2)

  Creates a label.

  Parameters:
    `category` - the category.
    `width` - the available width.
    `edge` - the edge on which the axis appears.
    `g2` - the graphics device.
  Returns:
    A label.

### calculateTextBlockWidth

    protected double calculateTextBlockWidth(org.jfree.text.TextBlock block,
                                             CategoryLabelPosition position,
                                             java.awt.Graphics2D g2)

  A utility method for determining the width of a text block.

  Parameters:
    `block` - the text block.
    `position` - the position.
    `g2` - the graphics device.
  Returns:
    The width.

### calculateTextBlockHeight

    protected double calculateTextBlockHeight(org.jfree.text.TextBlock block,
                                              CategoryLabelPosition position,
                                              java.awt.Graphics2D g2)

  A utility method for determining the height of a text block.

  Parameters:
    `block` - the text block.
    `position` - the label position.
    `g2` - the graphics device.
  Returns:
    The height.

### clone

    public java.lang.Object clone()
                           throws java.lang.CloneNotSupportedException

  Creates a clone of the axis.

  Overrides:
    `clone` in class `Axis`
  Returns:
    A clone.
  Throws:
    `java.lang.CloneNotSupportedException` - if some component of the axis does not support cloning.

### equals

    public boolean equals(java.lang.Object obj)

  Tests this axis for equality with an arbitrary object.

  Overrides:
    `equals` in class `Axis`
  Parameters:
    `obj` - the object (`null` permitted).
  Returns:
    A boolean.

### hashCode

    public int hashCode()

  Returns a hash code for this object.

  Overrides:
    `hashCode` in class `java.lang.Object`
  Returns:
    A hash code.

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