JSeparator (Java SE 25 & JDK 25)
Description: declaration: module: java.desktop, package: javax.swing, class: JSeparator
Keywords: javax.swing.JSeparator class

# Class JSeparator

java.lang.Object
java.awt.Component
java.awt.Container
javax.swing.JComponent
javax.swing.JSeparator

All Implemented Interfaces:
  `ImageObserver, MenuContainer, Serializable, Accessible, SwingConstants`

Direct Known Subclasses:
  `JPopupMenu.Separator, JToolBar.Separator`

@JavaBean(defaultProperty="UI", description="A divider between menu items.") public class JSeparator extends JComponent implements SwingConstants, Accessible
`JSeparator` provides a general purpose component for implementing divider lines - most commonly used as a divider between menu items that breaks them up into logical groupings. Instead of using `JSeparator` directly, you can use the `JMenu` or `JPopupMenu` `addSeparator` method to create and add a separator. `JSeparator`s may also be used elsewhere in a GUI wherever a visual divider is useful.

For more information and examples see How to Use Menus, a section in The Java Tutorial.

Warning: Swing is not thread safe. For more information see Swing's Threading Policy.

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`.

Since:
  1.2

- ## Nested Class Summary

  Nested Classes
  Modifier and Type
  Class
  Description
  `protected class`
  `JSeparator.AccessibleJSeparator`
  This class implements accessibility support for the `JSeparator` class.

  ### Nested classes/interfaces declared in class JComponent

  `JComponent.AccessibleJComponent`

  ### Nested classes/interfaces declared in class Container

  `Container.AccessibleAWTContainer`

  ### Nested classes/interfaces declared in class Component

  `Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy`

- ## Field Summary

  ### Fields declared in class JComponent

  `listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW`

  ### Fields declared in class Component

  `accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT`

  ### Fields declared in interface ImageObserver

  `ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH`

  ### Fields declared in interface SwingConstants

  `BOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `JSeparator()`
  Creates a new horizontal separator.
  `JSeparator(int orientation)`
  Creates a new separator with the specified horizontal or vertical orientation.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `AccessibleContext`
  `getAccessibleContext()`
  Gets the AccessibleContext associated with this JSeparator.
  `int`
  `getOrientation()`
  Returns the orientation of this separator.
  `SeparatorUI`
  `getUI()`
  Returns the L&F object that renders this component.
  `String`
  `getUIClassID()`
  Returns the name of the L&F class that renders this component.
  `protected String`
  `paramString()`
  Returns a string representation of this `JSeparator`.
  `void`
  `setOrientation(int orientation)`
  Sets the orientation of the separator.
  `void`
  `setUI(SeparatorUI ui)`
  Sets the L&F object that renders this component.
  `void`
  `updateUI()`
  Resets the UI property to a value from the current look and feel.

  ### Methods declared in class JComponent

  `addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, 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, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, hide, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingOrigin, 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 declared in class 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, transferFocusDownCycle, validate, validateTree`

  ### Methods declared in class 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, 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, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, 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, requestFocus, requestFocus, requestFocusInWindow, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setMixingCutoutShape, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle`

  ### Methods declared in class Object

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

- ## Constructor Details

  - ### JSeparator

    public JSeparator()
    Creates a new horizontal separator.

  - ### JSeparator

    public JSeparator(int orientation)
    Creates a new separator with the specified horizontal or vertical orientation.
    Parameters:
      `orientation` - an integer specifying `SwingConstants.HORIZONTAL` or `SwingConstants.VERTICAL`
    Throws:
      `IllegalArgumentException` - if `orientation` is neither `SwingConstants.HORIZONTAL` nor `SwingConstants.VERTICAL`

- ## Method Details

  - ### getUI

    public SeparatorUI getUI()
    Returns the L&F object that renders this component.
    Overrides:
      `getUI` in class `JComponent`
    Returns:
      the SeparatorUI object that renders this component

  - ### setUI

    @BeanProperty(hidden=true, visualUpdate=true, description="The UI object that implements the Component's LookAndFeel.") public void setUI(SeparatorUI ui)
    Sets the L&F object that renders this component.
    Parameters:
      `ui` - the SeparatorUI L&F object
    See Also:
      - `UIDefaults.getUI(JComponent)`

  - ### updateUI

    public void updateUI()
    Resets the UI property to a value from the current look and feel.
    Overrides:
      `updateUI` in class `JComponent`
    See Also:
      - `JComponent.updateUI()`

  - ### getUIClassID

    @BeanProperty(bound=false) public String getUIClassID()
    Returns the name of the L&F class that renders this component.
    Overrides:
      `getUIClassID` in class `JComponent`
    Returns:
      the string "SeparatorUI"
    See Also:
      - `JComponent.getUIClassID()`
      - `UIDefaults.getUI(JComponent)`

  - ### getOrientation

    public int getOrientation()
    Returns the orientation of this separator.
    Returns:
      The value of the orientation property, one of the following constants defined in `SwingConstants`: `VERTICAL`, or `HORIZONTAL`.
    See Also:
      - `SwingConstants`
      - `setOrientation(int)`

  - ### setOrientation

    @BeanProperty(preferred=true, visualUpdate=true, enumerationValues={"SwingConstants.HORIZONTAL","SwingConstants.VERTICAL"}, description="The orientation of the separator.") public void setOrientation(int orientation)
    Sets the orientation of the separator. The default value of this property is HORIZONTAL.
    Parameters:
      `orientation` - either `SwingConstants.HORIZONTAL` or `SwingConstants.VERTICAL`
    Throws:
      `IllegalArgumentException` - if `orientation` is neither `SwingConstants.HORIZONTAL` nor `SwingConstants.VERTICAL`
    See Also:
      - `SwingConstants`
      - `getOrientation()`

  - ### paramString

    protected String paramString()
    Returns a string representation of this `JSeparator`. 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`.
    Overrides:
      `paramString` in class `JComponent`
    Returns:
      a string representation of this `JSeparator`

  - ### getAccessibleContext

    @BeanProperty(bound=false) public AccessibleContext getAccessibleContext()
    Gets the AccessibleContext associated with this JSeparator. For separators, the AccessibleContext takes the form of an AccessibleJSeparator. A new AccessibleJSeparator instance is created if necessary.
    Specified by:
      `getAccessibleContext` in interface `Accessible`
    Overrides:
      `getAccessibleContext` in class `Component`
    Returns:
      an AccessibleJSeparator that serves as the AccessibleContext of this JSeparator