# Class JProgressBar

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

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

@JavaBean(defaultProperty="UI", description="A component that displays an integer value.") public class JProgressBar extends JComponent implements SwingConstants, Accessible
A component that visually displays the progress of some task. As the task progresses towards completion, the progress bar displays the task's percentage of completion. This percentage is typically represented visually by a rectangle which starts out empty and gradually becomes filled in as the task progresses. In addition, the progress bar can display a textual representation of this percentage.

`JProgressBar` uses a `BoundedRangeModel` as its data model, with the `value` property representing the "current" state of the task, and the `minimum` and `maximum` properties representing the beginning and end points, respectively.

To indicate that a task of unknown length is executing, you can put a progress bar into indeterminate mode. While the bar is in indeterminate mode, it animates constantly to show that work is occurring. As soon as you can determine the task's length and amount of progress, you should update the progress bar's value and switch it back to determinate mode.

Here is an example of creating a progress bar, where `task` is an object (representing some piece of work) which returns information about the progress of the task:

    progressBar = new JProgressBar(0, task.getLengthOfTask());
    progressBar.setValue(0);
    progressBar.setStringPainted(true);

Here is an example of querying the current state of the task, and using the returned value to update the progress bar:

    progressBar.setValue(task.getCurrent());

Here is an example of putting a progress bar into indeterminate mode, and then switching back to determinate mode once the length of the task is known:

    progressBar = new JProgressBar();
    ...//when the task of (initially) unknown length begins:
    progressBar.setIndeterminate(true);
    ...//do some work; get length of task...
    progressBar.setMaximum(newLength);
    progressBar.setValue(newValue);
    progressBar.setIndeterminate(false);

For complete examples and further documentation see How to Monitor Progress, 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
See Also:
  - `BasicProgressBarUI`
  - `BoundedRangeModel`
  - `SwingWorker`

- ## Nested Class Summary

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

  ### Nested classes/interfaces declared in class javax.swing.JComponent

  `JComponent.AccessibleJComponent`

  ### Nested classes/interfaces declared in class java.awt.Container

  `Container.AccessibleAWTContainer`

  ### Nested classes/interfaces declared in class java.awt.Component

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

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `protected ChangeEvent`
  `changeEvent`
  Only one `ChangeEvent` is needed per instance since the event's only interesting property is the immutable source, which is the progress bar.
  `protected ChangeListener`
  `changeListener`
  Listens for change events sent by the progress bar's model, redispatching them to change-event listeners registered upon this progress bar.
  `protected BoundedRangeModel`
  `model`
  The object that holds the data for the progress bar.
  `protected int`
  `orientation`
  Whether the progress bar is horizontal or vertical.
  `protected boolean`
  `paintBorder`
  Whether to display a border around the progress bar.
  `protected boolean`
  `paintString`
  Whether to display a string of text on the progress bar.
  `protected String`
  `progressString`
  An optional string that can be displayed on the progress bar.

  ### Fields declared in class javax.swing.JComponent

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

  ### Fields declared in class java.awt.Component

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

  ### Fields declared in interface java.awt.image.ImageObserver

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

  ### Fields declared in interface javax.swing.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
  `JProgressBar()`
  Creates a horizontal progress bar that displays a border but no progress string.
  `JProgressBar(int orient)`
  Creates a progress bar with the specified orientation, which can be either `SwingConstants.VERTICAL` or `SwingConstants.HORIZONTAL`.
  `JProgressBar(int min, int max)`
  Creates a horizontal progress bar with the specified minimum and maximum.
  `JProgressBar(int orient, int min, int max)`
  Creates a progress bar using the specified orientation, minimum, and maximum.
  `JProgressBar(BoundedRangeModel newModel)`
  Creates a horizontal progress bar that uses the specified model to hold the progress bar's data.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `addChangeListener(ChangeListener l)`
  Adds the specified `ChangeListener` to the progress bar.
  `protected ChangeListener`
  `createChangeListener()`
  Subclasses that want to handle change events from the model differently can override this to return an instance of a custom `ChangeListener` implementation.
  `protected void`
  `fireStateChanged()`
  Send a `ChangeEvent`, whose source is this `JProgressBar`, to all `ChangeListener`s that have registered interest in `ChangeEvent`s.
  `AccessibleContext`
  `getAccessibleContext()`
  Gets the `AccessibleContext` associated with this `JProgressBar`.
  `ChangeListener[]`
  `getChangeListeners()`
  Returns an array of all the `ChangeListener`s added to this progress bar with `addChangeListener`.
  `int`
  `getMaximum()`
  Returns the progress bar's `maximum` value from the `BoundedRangeModel`.
  `int`
  `getMinimum()`
  Returns the progress bar's `minimum` value from the `BoundedRangeModel`.
  `BoundedRangeModel`
  `getModel()`
  Returns the data model used by this progress bar.
  `int`
  `getOrientation()`
  Returns `SwingConstants.VERTICAL` or `SwingConstants.HORIZONTAL`, depending on the orientation of the progress bar.
  `double`
  `getPercentComplete()`
  Returns the percent complete for the progress bar.
  `String`
  `getString()`
  Returns a `String` representation of the current progress.
  `ProgressBarUI`
  `getUI()`
  Returns the look-and-feel object that renders this component.
  `String`
  `getUIClassID()`
  Returns the name of the look-and-feel class that renders this component.
  `int`
  `getValue()`
  Returns the progress bar's current `value` from the `BoundedRangeModel`.
  `boolean`
  `isBorderPainted()`
  Returns the `borderPainted` property.
  `boolean`
  `isIndeterminate()`
  Returns the value of the `indeterminate` property.
  `boolean`
  `isStringPainted()`
  Returns the value of the `stringPainted` property.
  `protected void`
  `paintBorder(Graphics g)`
  Paints the progress bar's border if the `borderPainted` property is `true`.
  `protected String`
  `paramString()`
  Returns a string representation of this `JProgressBar`.
  `void`
  `removeChangeListener(ChangeListener l)`
  Removes a `ChangeListener` from the progress bar.
  `void`
  `setBorderPainted(boolean b)`
  Sets the `borderPainted` property, which is `true` if the progress bar should paint its border.
  `void`
  `setIndeterminate(boolean newValue)`
  Sets the `indeterminate` property of the progress bar, which determines whether the progress bar is in determinate or indeterminate mode.
  `void`
  `setMaximum(int n)`
  Sets the progress bar's maximum value (stored in the progress bar's data model) to `n`.
  `void`
  `setMinimum(int n)`
  Sets the progress bar's minimum value (stored in the progress bar's data model) to `n`.
  `void`
  `setModel(BoundedRangeModel newModel)`
  Sets the data model used by the `JProgressBar`.
  `void`
  `setOrientation(int newOrientation)`
  Sets the progress bar's orientation to `newOrientation`, which must be `SwingConstants.VERTICAL` or `SwingConstants.HORIZONTAL`.
  `void`
  `setString(String s)`
  Sets the value of the progress string.
  `void`
  `setStringPainted(boolean b)`
  Sets the value of the `stringPainted` property, which determines whether the progress bar should render a progress string.
  `void`
  `setUI(ProgressBarUI ui)`
  Sets the look-and-feel object that renders this component.
  `void`
  `setValue(int n)`
  Sets the progress bar's current value to `n`.
  `void`
  `updateUI()`
  Resets the UI property to a value from the current look and feel.

  ### Methods declared in class javax.swing.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, 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 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, transferFocusDownCycle, validate, validateTree`

  ### Methods declared in 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, 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 java.lang.Object

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

- ## Field Details

  - ### orientation

    protected int orientation
    Whether the progress bar is horizontal or vertical. The default is `HORIZONTAL`.
    See Also:
      - `setOrientation(int)`

  - ### paintBorder

    protected boolean paintBorder
    Whether to display a border around the progress bar. The default is `true`.
    See Also:
      - `setBorderPainted(boolean)`

  - ### model

    protected BoundedRangeModel model
    The object that holds the data for the progress bar.
    See Also:
      - `setModel(javax.swing.BoundedRangeModel)`

  - ### progressString

    protected String progressString
    An optional string that can be displayed on the progress bar. The default is `null`. Setting this to a non-`null` value does not imply that the string will be displayed. To display the string, `paintString` must be `true`.
    See Also:
      - `setString(java.lang.String)`
      - `setStringPainted(boolean)`

  - ### paintString

    protected boolean paintString
    Whether to display a string of text on the progress bar. The default is `false`. Setting this to `true` causes a textual display of the progress to be rendered on the progress bar. If the `progressString` is `null`, the percentage of completion is displayed on the progress bar. Otherwise, the `progressString` is rendered on the progress bar.
    See Also:
      - `setStringPainted(boolean)`
      - `setString(java.lang.String)`

  - ### changeEvent

    protected transient ChangeEvent changeEvent
    Only one `ChangeEvent` is needed per instance since the event's only interesting property is the immutable source, which is the progress bar. The event is lazily created the first time that an event notification is fired.
    See Also:
      - `fireStateChanged()`

  - ### changeListener

    protected ChangeListener changeListener
    Listens for change events sent by the progress bar's model, redispatching them to change-event listeners registered upon this progress bar.
    See Also:
      - `createChangeListener()`

- ## Constructor Details

  - ### JProgressBar

    public JProgressBar()
    Creates a horizontal progress bar that displays a border but no progress string. The initial and minimum values are 0, and the maximum is 100.
    See Also:
      - `setOrientation(int)`
      - `setBorderPainted(boolean)`
      - `setStringPainted(boolean)`
      - `setString(java.lang.String)`
      - `setIndeterminate(boolean)`

  - ### JProgressBar

    public JProgressBar(int orient)
    Creates a progress bar with the specified orientation, which can be either `SwingConstants.VERTICAL` or `SwingConstants.HORIZONTAL`. By default, a border is painted but a progress string is not. The initial and minimum values are 0, and the maximum is 100.
    Parameters:
      `orient` - the desired orientation of the progress bar
    Throws:
      `IllegalArgumentException` - if `orient` is an illegal value
    See Also:
      - `setOrientation(int)`
      - `setBorderPainted(boolean)`
      - `setStringPainted(boolean)`
      - `setString(java.lang.String)`
      - `setIndeterminate(boolean)`

  - ### JProgressBar

    public JProgressBar(int min, int max)
    Creates a horizontal progress bar with the specified minimum and maximum. Sets the initial value of the progress bar to the specified minimum. By default, a border is painted but a progress string is not.

    The `BoundedRangeModel` that holds the progress bar's data handles any issues that may arise from improperly setting the minimum, initial, and maximum values on the progress bar. See the `BoundedRangeModel` documentation for details.

    Parameters:
      `min` - the minimum value of the progress bar
      `max` - the maximum value of the progress bar
    See Also:
      - `BoundedRangeModel`
      - `setOrientation(int)`
      - `setBorderPainted(boolean)`
      - `setStringPainted(boolean)`
      - `setString(java.lang.String)`
      - `setIndeterminate(boolean)`

  - ### JProgressBar

    public JProgressBar(int orient, int min, int max)
    Creates a progress bar using the specified orientation, minimum, and maximum. By default, a border is painted but a progress string is not. Sets the initial value of the progress bar to the specified minimum.

    The `BoundedRangeModel` that holds the progress bar's data handles any issues that may arise from improperly setting the minimum, initial, and maximum values on the progress bar. See the `BoundedRangeModel` documentation for details.

    Parameters:
      `orient` - the desired orientation of the progress bar
      `min` - the minimum value of the progress bar
      `max` - the maximum value of the progress bar
    Throws:
      `IllegalArgumentException` - if `orient` is an illegal value
    See Also:
      - `BoundedRangeModel`
      - `setOrientation(int)`
      - `setBorderPainted(boolean)`
      - `setStringPainted(boolean)`
      - `setString(java.lang.String)`
      - `setIndeterminate(boolean)`

  - ### JProgressBar

    public JProgressBar(BoundedRangeModel newModel)
    Creates a horizontal progress bar that uses the specified model to hold the progress bar's data. By default, a border is painted but a progress string is not.
    Parameters:
      `newModel` - the data model for the progress bar
    See Also:
      - `setOrientation(int)`
      - `setBorderPainted(boolean)`
      - `setStringPainted(boolean)`
      - `setString(java.lang.String)`
      - `setIndeterminate(boolean)`

- ## Method Details

  - ### getOrientation

    public int getOrientation()
    Returns `SwingConstants.VERTICAL` or `SwingConstants.HORIZONTAL`, depending on the orientation of the progress bar. The default orientation is `SwingConstants.HORIZONTAL`.
    Returns:
      `HORIZONTAL` or `VERTICAL`
    See Also:
      - `setOrientation(int)`

  - ### setOrientation

    @BeanProperty(preferred=true, visualUpdate=true, description="Set the progress bar's orientation.") public void setOrientation(int newOrientation)
    Sets the progress bar's orientation to `newOrientation`, which must be `SwingConstants.VERTICAL` or `SwingConstants.HORIZONTAL`. The default orientation is `SwingConstants.HORIZONTAL`.
    Parameters:
      `newOrientation` - `HORIZONTAL` or `VERTICAL`
    Throws:
      `IllegalArgumentException` - if `newOrientation` is an illegal value
    See Also:
      - `getOrientation()`

  - ### isStringPainted

    public boolean isStringPainted()
    Returns the value of the `stringPainted` property.
    Returns:
      the value of the `stringPainted` property
    See Also:
      - `setStringPainted(boolean)`
      - `setString(java.lang.String)`

  - ### setStringPainted

    @BeanProperty(visualUpdate=true, description="Whether the progress bar should render a string.") public void setStringPainted(boolean b)
    Sets the value of the `stringPainted` property, which determines whether the progress bar should render a progress string. The default is `false`, meaning no string is painted. Some look and feels might not support progress strings or might support them only when the progress bar is in determinate mode.
    Parameters:
      `b` - `true` if the progress bar should render a string
    See Also:
      - `isStringPainted()`
      - `setString(java.lang.String)`

  - ### getString

    public String getString()
    Returns a `String` representation of the current progress. By default, this returns a simple percentage `String` based on the value returned from `getPercentComplete`. An example would be the "42%". You can change this by calling `setString`.
    Returns:
      the value of the progress string, or a simple percentage string if the progress string is `null`
    See Also:
      - `setString(java.lang.String)`

  - ### setString

    @BeanProperty(visualUpdate=true, description="Specifies the progress string to paint") public void setString(String s)
    Sets the value of the progress string. By default, this string is `null`, implying the built-in behavior of using a simple percent string. If you have provided a custom progress string and want to revert to the built-in behavior, set the string back to `null`.

    The progress string is painted only if the `isStringPainted` method returns `true`.

    Parameters:
      `s` - the value of the progress string
    See Also:
      - `getString()`
      - `setStringPainted(boolean)`
      - `isStringPainted()`

  - ### getPercentComplete

    @BeanProperty(bound=false) public double getPercentComplete()
    Returns the percent complete for the progress bar. Note that this number is between 0.0 and 1.0.
    Returns:
      the percent complete for this progress bar

  - ### isBorderPainted

    public boolean isBorderPainted()
    Returns the `borderPainted` property.
    Returns:
      the value of the `borderPainted` property
    See Also:
      - `setBorderPainted(boolean)`

  - ### setBorderPainted

    @BeanProperty(visualUpdate=true, description="Whether the progress bar should paint its border.") public void setBorderPainted(boolean b)
    Sets the `borderPainted` property, which is `true` if the progress bar should paint its border. The default value for this property is `true`. Some look and feels might not implement painted borders; they will ignore this property.
    Parameters:
      `b` - `true` if the progress bar should paint its border; otherwise, `false`
    See Also:
      - `isBorderPainted()`

  - ### paintBorder

    protected void paintBorder(Graphics g)
    Paints the progress bar's border if the `borderPainted` property is `true`.
    Overrides:
      `paintBorder` in class `JComponent`
    Parameters:
      `g` - the `Graphics` context within which to paint the border
    See Also:
      - `JComponent.paint(java.awt.Graphics)`
      - `JComponent.setBorder(javax.swing.border.Border)`
      - `isBorderPainted()`
      - `setBorderPainted(boolean)`

  - ### getUI

    public ProgressBarUI getUI()
    Returns the look-and-feel object that renders this component.
    Overrides:
      `getUI` in class `JComponent`
    Returns:
      the `ProgressBarUI` object that renders this component

  - ### setUI

    @BeanProperty(hidden=true, visualUpdate=true, description="The UI object that implements the Component's LookAndFeel.") public void setUI(ProgressBarUI ui)
    Sets the look-and-feel object that renders this component.
    Parameters:
      `ui` - a `ProgressBarUI` object
    See Also:
      - `UIDefaults.getUI(javax.swing.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, expert=true, description="A string that specifies the name of the look-and-feel class.") public String getUIClassID()
    Returns the name of the look-and-feel class that renders this component.
    Overrides:
      `getUIClassID` in class `JComponent`
    Returns:
      the string "ProgressBarUI"
    See Also:
      - `JComponent.getUIClassID()`
      - `UIDefaults.getUI(javax.swing.JComponent)`

  - ### createChangeListener

    protected ChangeListener createChangeListener()
    Subclasses that want to handle change events from the model differently can override this to return an instance of a custom `ChangeListener` implementation. The default `ChangeListener` simply calls the `fireStateChanged` method to forward `ChangeEvent`s to the `ChangeListener`s that have been added directly to the progress bar.
    Returns:
      the instance of a custom `ChangeListener` implementation.
    See Also:
      - `changeListener`
      - `fireStateChanged()`
      - `ChangeListener`
      - `BoundedRangeModel`

  - ### addChangeListener

    public void addChangeListener(ChangeListener l)
    Adds the specified `ChangeListener` to the progress bar.
    Parameters:
      `l` - the `ChangeListener` to add

  - ### removeChangeListener

    public void removeChangeListener(ChangeListener l)
    Removes a `ChangeListener` from the progress bar.
    Parameters:
      `l` - the `ChangeListener` to remove

  - ### getChangeListeners

    @BeanProperty(bound=false) public ChangeListener[] getChangeListeners()
    Returns an array of all the `ChangeListener`s added to this progress bar with `addChangeListener`.
    Returns:
      all of the `ChangeListener`s added or an empty array if no listeners have been added
    Since:
      1.4

  - ### fireStateChanged

    protected void fireStateChanged()
    Send a `ChangeEvent`, whose source is this `JProgressBar`, to all `ChangeListener`s that have registered interest in `ChangeEvent`s. This method is called each time a `ChangeEvent` is received from the model.

    The event instance is created if necessary, and stored in `changeEvent`.

    See Also:
      - `addChangeListener(javax.swing.event.ChangeListener)`
      - `EventListenerList`

  - ### getModel

    public BoundedRangeModel getModel()
    Returns the data model used by this progress bar.
    Returns:
      the `BoundedRangeModel` currently in use
    See Also:
      - `setModel(javax.swing.BoundedRangeModel)`
      - `BoundedRangeModel`

  - ### setModel

    @BeanProperty(bound=false, expert=true, description="The data model used by the JProgressBar.") public void setModel(BoundedRangeModel newModel)
    Sets the data model used by the `JProgressBar`. Note that the `BoundedRangeModel`'s `extent` is not used, and is set to `0`.
    Parameters:
      `newModel` - the `BoundedRangeModel` to use

  - ### getValue

    public int getValue()
    Returns the progress bar's current `value` from the `BoundedRangeModel`. The value is always between the minimum and maximum values, inclusive.
    Returns:
      the current value of the progress bar
    See Also:
      - `setValue(int)`
      - `BoundedRangeModel.getValue()`

  - ### getMinimum

    public int getMinimum()
    Returns the progress bar's `minimum` value from the `BoundedRangeModel`.
    Returns:
      the progress bar's minimum value
    See Also:
      - `setMinimum(int)`
      - `BoundedRangeModel.getMinimum()`

  - ### getMaximum

    public int getMaximum()
    Returns the progress bar's `maximum` value from the `BoundedRangeModel`.
    Returns:
      the progress bar's maximum value
    See Also:
      - `setMaximum(int)`
      - `BoundedRangeModel.getMaximum()`

  - ### setValue

    @BeanProperty(bound=false, preferred=true, description="The progress bar's current value.") public void setValue(int n)
    Sets the progress bar's current value to `n`. This method forwards the new value to the model.

    The data model (an instance of `BoundedRangeModel`) handles any mathematical issues arising from assigning faulty values. See the `BoundedRangeModel` documentation for details.

    If the new value is different from the previous value, all change listeners are notified.

    Parameters:
      `n` - the new value
    See Also:
      - `getValue()`
      - `addChangeListener(javax.swing.event.ChangeListener)`
      - `BoundedRangeModel.setValue(int)`

  - ### setMinimum

    @BeanProperty(bound=false, preferred=true, description="The progress bar's minimum value.") public void setMinimum(int n)
    Sets the progress bar's minimum value (stored in the progress bar's data model) to `n`.

    The data model (a `BoundedRangeModel` instance) handles any mathematical issues arising from assigning faulty values. See the `BoundedRangeModel` documentation for details.

    If the minimum value is different from the previous minimum, all change listeners are notified.

    Parameters:
      `n` - the new minimum
    See Also:
      - `getMinimum()`
      - `addChangeListener(javax.swing.event.ChangeListener)`
      - `BoundedRangeModel.setMinimum(int)`

  - ### setMaximum

    @BeanProperty(bound=false, preferred=true, description="The progress bar's maximum value.") public void setMaximum(int n)
    Sets the progress bar's maximum value (stored in the progress bar's data model) to `n`.

    The underlying `BoundedRangeModel` handles any mathematical issues arising from assigning faulty values. See the `BoundedRangeModel` documentation for details.

    If the maximum value is different from the previous maximum, all change listeners are notified.

    Parameters:
      `n` - the new maximum
    See Also:
      - `getMaximum()`
      - `addChangeListener(javax.swing.event.ChangeListener)`
      - `BoundedRangeModel.setMaximum(int)`

  - ### setIndeterminate

    public void setIndeterminate(boolean newValue)
    Sets the `indeterminate` property of the progress bar, which determines whether the progress bar is in determinate or indeterminate mode. An indeterminate progress bar continuously displays animation indicating that an operation of unknown length is occurring. By default, this property is `false`. Some look and feels might not support indeterminate progress bars; they will ignore this property.

    See How to Monitor Progress for examples of using indeterminate progress bars.

    Parameters:
      `newValue` - `true` if the progress bar should change to indeterminate mode; `false` if it should revert to normal.
    Since:
      1.4
    See Also:
      - `isIndeterminate()`
      - `BasicProgressBarUI`

  - ### isIndeterminate

    @BeanProperty(bound=false, description="Is the progress bar indeterminate (true) or normal (false)?") public boolean isIndeterminate()
    Returns the value of the `indeterminate` property.
    Returns:
      the value of the `indeterminate` property
    Since:
      1.4
    See Also:
      - `setIndeterminate(boolean)`

  - ### paramString

    protected String paramString()
    Returns a string representation of this `JProgressBar`. This method is intended to be used only for debugging purposes. 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 `JProgressBar`

  - ### getAccessibleContext

    @BeanProperty(bound=false, expert=true, description="The AccessibleContext associated with this ProgressBar.") public AccessibleContext getAccessibleContext()
    Gets the `AccessibleContext` associated with this `JProgressBar`. For progress bars, the `AccessibleContext` takes the form of an `AccessibleJProgressBar`. A new `AccessibleJProgressBar` instance is created if necessary.
    Specified by:
      `getAccessibleContext` in interface `Accessible`
    Overrides:
      `getAccessibleContext` in class `Component`
    Returns:
      an `AccessibleJProgressBar` that serves as the `AccessibleContext` of this `JProgressBar`