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JProgressBar progressBar = new JProgressBar();
Based on 58 examples
JProgressBar progressBar = new JProgressBar(0, 100);
Based on 55 examples
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.
{@code JProgressBar} uses a {@code BoundedRangeModel} as its data model, with the {@code value} property representing the "current" state of the task, and the {@code minimum} and {@code 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 JavaBeansTM
has been added to the java.beans
package.
Please see {@link java.beans.XMLEncoder}.
Nested Class Summary | |
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protected class |
This class implements accessibility support for the JProgressBar class. |
Nested classes/interfaces inherited from class javax.swing.JComponent |
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JComponent.AccessibleJComponent |
Nested classes/interfaces inherited from class java.awt.Container |
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Container.AccessibleAWTContainer |
Nested classes/interfaces inherited from class java.awt.Component |
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Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy |
Field Summary | |
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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. |
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 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 |
Constructor Summary | |
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Creates a horizontal progress bar that displays a border but no progress string. |
|
JProgressBar(BoundedRangeModel newModel) Creates a horizontal progress bar that uses the specified model to hold the progress bar's data. |
|
JProgressBar(int orient) Creates a progress bar with the specified orientation, which can be either or . |
|
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. |
Method Summary | |
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void |
Adds the specified ChangeListener to the progress bar.
|
protected ChangeListener |
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 |
Send a , whose source is this , to all s that have registered interest in s. |
AccessibleContext |
Gets the AccessibleContext associated with this
JProgressBar .
|
ChangeListener[] |
Returns an array of all the ChangeListener s added
to this progress bar with addChangeListener .
|
int |
Returns the progress bar's value from the BoundedRangeModel .
|
int |
Returns the progress bar's value from the BoundedRangeModel .
|
BoundedRangeModel |
getModel() Returns the data model used by this progress bar. |
int |
Returns or , depending on the orientation of the progress bar. |
double |
Returns the percent complete for the progress bar. |
String |
Returns a representation of the current progress. |
ProgressBarUI |
getUI() Returns the look-and-feel object that renders this component. |
String |
Returns the name of the look-and-feel class that renders this component. |
int |
getValue() Returns the progress bar's current from the BoundedRangeModel .
|
boolean |
Returns the borderPainted property.
|
boolean |
Returns the value of the indeterminate property.
|
boolean |
Returns the value of the stringPainted property.
|
protected void |
Paints the progress bar's border if the borderPainted
property is true .
|
protected String |
Returns a string representation of this JProgressBar .
|
void |
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 or
.
|
void |
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 . |
void |
updateUI() Resets the UI property to a value from the current look and feel. |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected transient ChangeEvent changeEvent
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.
protected ChangeListener changeListener
protected BoundedRangeModel model
protected int orientation
HORIZONTAL
.
protected boolean paintBorder
true
.
protected boolean paintString
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.
protected String progressString
null
. Setting this to a non-null
value does not imply that the string will be displayed.
To display the string, {@code paintString} must be {@code true}.
Constructor Detail |
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public JProgressBar()
public JProgressBar(BoundedRangeModel newModel)
newModel
- the data model for the progress barpublic JProgressBar(int orient)
orient
- the desired orientation of the progress barpublic JProgressBar(int min, int max)
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 {@code BoundedRangeModel} documentation for details.
min
- the minimum value of the progress barmax
- the maximum value of the progress barpublic JProgressBar(int orient, int min, int max)
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 {@code BoundedRangeModel} documentation for details.
orient
- the desired orientation of the progress barmin
- the minimum value of the progress barmax
- the maximum value of the progress barMethod Detail |
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public void addChangeListener(ChangeListener l)
ChangeListener
to the progress bar.
l
- the ChangeListener
to addprotected ChangeListener createChangeListener()
ChangeListener
implementation.
The default {@code ChangeListener} simply calls the
{@code fireStateChanged} method to forward {@code ChangeEvent}s
to the {@code ChangeListener}s that have been added directly to the
progress bar.
protected void fireStateChanged()
The event instance is created if necessary, and stored in {@code changeEvent}.
public AccessibleContext getAccessibleContext()
AccessibleContext
associated with this
JProgressBar
. For progress bars, the
AccessibleContext
takes the form of an
AccessibleJProgressBar
.
A new AccessibleJProgressBar
instance is created if necessary.
getAccessibleContext
in class JComponent
AccessibleJProgressBar
that serves as the
AccessibleContext
of this JProgressBar
public ChangeListener[] getChangeListeners()
ChangeListener
s added
to this progress bar with addChangeListener
.
ChangeListener
s added or an empty
array if no listeners have been addedpublic int getMaximum()
BoundedRangeModel
.
public int getMinimum()
BoundedRangeModel
.
public BoundedRangeModel getModel()
BoundedRangeModel
currently in usepublic int getOrientation()
HORIZONTAL
or VERTICAL
public double getPercentComplete()
public String getString()
public ProgressBarUI getUI()
ProgressBarUI
object that renders this componentpublic String getUIClassID()
getUIClassID
in class JComponent
public int getValue()
BoundedRangeModel
.
The value is always between the
minimum and maximum values, inclusive.
public boolean isBorderPainted()
borderPainted
property.
borderPainted
propertypublic boolean isIndeterminate()
indeterminate
property.
indeterminate
propertypublic boolean isStringPainted()
stringPainted
property.
stringPainted
propertyprotected void paintBorder(Graphics g)
borderPainted
property is true
.
paintBorder
in class JComponent
g
- the Graphics
context within which to paint the borderprotected String paramString()
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
.
paramString
in class JComponent
JProgressBar
public void removeChangeListener(ChangeListener l)
ChangeListener
from the progress bar.
l
- the ChangeListener
to removepublic void setBorderPainted(boolean b)
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.
b
- true
if the progress bar
should paint its border;
otherwise, false
public void setIndeterminate(boolean newValue)
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.
newValue
- true
if the progress bar
should change to indeterminate mode;
false
if it should revert to normal.public void setMaximum(int n)
n
.
The underlying BoundedRangeModel
handles any mathematical
issues arising from assigning faulty values.
See the {@code BoundedRangeModel} documentation for details.
If the maximum value is different from the previous maximum, all change listeners are notified.
n
- the new maximumpublic void setMinimum(int n)
n
.
The data model (a BoundedRangeModel
instance)
handles any mathematical
issues arising from assigning faulty values.
See the {@code BoundedRangeModel} documentation for details.
If the minimum value is different from the previous minimum, all change listeners are notified.
n
- the new minimumpublic void setModel(BoundedRangeModel newModel)
JProgressBar
.
Note that the {@code BoundedRangeModel}'s {@code extent} is not used,
and is set to {@code 0}.
newModel
- the BoundedRangeModel
to usepublic void setOrientation(int newOrientation)
newOrientation
,
which must be {@code SwingConstants.VERTICAL} or
{@code SwingConstants.HORIZONTAL}. The default orientation
is {@code SwingConstants.HORIZONTAL}.
newOrientation
- HORIZONTAL
or VERTICAL
public void setString(String s)
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
.
s
- the value of the progress stringpublic void setStringPainted(boolean b)
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.
b
- true
if the progress bar should render a stringpublic void setUI(ProgressBarUI ui)
ui
- a ProgressBarUI
objectpublic void setValue(int n)
The data model (an instance of {@code BoundedRangeModel}) handles any mathematical issues arising from assigning faulty values. See the {@code BoundedRangeModel} documentation for details.
If the new value is different from the previous value, all change listeners are notified.
n
- the new valuepublic void updateUI()
updateUI
in class JComponent
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