JSpinner (Java Platform SE 8 )
Keywords: javax.swing.JSpinner class
Date: 2017-07-29

javax.swing

## Class JSpinner

- java.lang.Object
- - java.awt.Component
  - - java.awt.Container
    - - javax.swing.JComponent
      - - javax.swing.JSpinner

- All Implemented Interfaces:
    ImageObserver, MenuContainer, Serializable, Accessible

      public class JSpinner
      extends JComponent
      implements Accessible

  A single line input field that lets the user select a number or an object value from an ordered sequence. Spinners typically provide a pair of tiny arrow buttons for stepping through the elements of the sequence. The keyboard up/down arrow keys also cycle through the elements. The user may also be allowed to type a (legal) value directly into the spinner. Although combo boxes provide similar functionality, spinners are sometimes preferred because they don't require a drop down list that can obscure important data.

  A `JSpinner`'s sequence value is defined by its `SpinnerModel`. The `model` can be specified as a constructor argument and changed with the `model` property. `SpinnerModel` classes for some common types are provided: `SpinnerListModel`, `SpinnerNumberModel`, and `SpinnerDateModel`.

  A `JSpinner` has a single child component that's responsible for displaying and potentially changing the current element or value of the model, which is called the `editor`. The editor is created by the `JSpinner`'s constructor and can be changed with the `editor` property. The `JSpinner`'s editor stays in sync with the model by listening for `ChangeEvent`s. If the user has changed the value displayed by the `editor` it is possible for the `model`'s value to differ from that of the `editor`. To make sure the `model` has the same value as the editor use the `commitEdit` method, eg:

         try {
             spinner.commitEdit();
         }
         catch (ParseException pe) {
             // Edited value is invalid, spinner.getValue() will return
             // the last valid value, you could revert the spinner to show that:
             JComponent editor = spinner.getEditor();
             if (editor instanceof DefaultEditor) {
                 ((DefaultEditor)editor).getTextField().setValue(spinner.getValue());
             }
             // reset the value to some known value:
             spinner.setValue(fallbackValue);
             // or treat the last valid value as the current, in which
             // case you don't need to do anything.
         }
         return spinner.getValue();

  For information and examples of using spinner see How to Use Spinners, 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:
    1.4
  See Also:
    `SpinnerModel`, `AbstractSpinnerModel`, `SpinnerListModel`, `SpinnerNumberModel`, `SpinnerDateModel`, `JFormattedTextField`

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `protected class` | `JSpinner.AccessibleJSpinner` `AccessibleJSpinner` implements accessibility support for the `JSpinner` class.
    `static class` | `JSpinner.DateEditor` An editor for a `JSpinner` whose model is a `SpinnerDateModel`.
    `static class` | `JSpinner.DefaultEditor` A simple base class for more specialized editors that displays a read-only view of the model's current value with a `JFormattedTextField`.
    `static class` | `JSpinner.ListEditor` An editor for a `JSpinner` whose model is a `SpinnerListModel`.
    `static class` | `JSpinner.NumberEditor` An editor for a `JSpinner` whose model is a `SpinnerNumberModel`.

    - ### 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

    - ### Fields inherited from class javax.swing.JComponent

      `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

      `accessibleContext, 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

    Constructors
    Constructor and Description
    `JSpinner()` Constructs a spinner with an `Integer SpinnerNumberModel` with initial value 0 and no minimum or maximum limits.
    `JSpinner(SpinnerModel model)` Constructs a spinner for the given model.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addChangeListener(ChangeListener listener)` Adds a listener to the list that is notified each time a change to the model occurs.
    `void` | `commitEdit()` Commits the currently edited value to the `SpinnerModel`.
    `protected JComponent` | `createEditor(SpinnerModel model)` This method is called by the constructors to create the `JComponent` that displays the current value of the sequence.
    `protected void` | `fireStateChanged()` Sends a `ChangeEvent`, whose source is this `JSpinner`, to each `ChangeListener`.
    `AccessibleContext` | `getAccessibleContext()` Gets the `AccessibleContext` for the `JSpinner`
    `ChangeListener[]` | `getChangeListeners()` Returns an array of all the `ChangeListener`s added to this JSpinner with addChangeListener().
    `JComponent` | `getEditor()` Returns the component that displays and potentially changes the model's value.
    `SpinnerModel` | `getModel()` Returns the `SpinnerModel` that defines this spinners sequence of values.
    `Object` | `getNextValue()` Returns the object in the sequence that comes after the object returned by `getValue()`.
    `Object` | `getPreviousValue()` Returns the object in the sequence that comes before the object returned by `getValue()`.
    `SpinnerUI` | `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.
    `Object` | `getValue()` Returns the current value of the model, typically this value is displayed by the `editor`.
    `void` | `removeChangeListener(ChangeListener listener)` Removes a `ChangeListener` from this spinner.
    `void` | `setEditor(JComponent editor)` Changes the `JComponent` that displays the current value of the `SpinnerModel`.
    `void` | `setModel(SpinnerModel model)` Changes the model that represents the value of this spinner.
    `void` | `setUI(SpinnerUI ui)` Sets the look and feel (L&F) object that renders this component.
    `void` | `setValue(Object value)` Changes current value of the model, typically this value is displayed by the `editor`.
    `void` | `updateUI()` Resets the UI property with the value from the current look and feel.

    - ### 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, 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, paramString, 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, 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, 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, transferFocusBackward, transferFocusUpCycle`

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### JSpinner

          public JSpinner(SpinnerModel model)

      Constructs a spinner for the given model. The spinner has a set of previous/next buttons, and an editor appropriate for the model.
      Throws:
        `NullPointerException` - if the model is `null`

    - #### JSpinner

          public JSpinner()

      Constructs a spinner with an `Integer SpinnerNumberModel` with initial value 0 and no minimum or maximum limits.

  - ### Method Detail

    - #### getUI

          public SpinnerUI getUI()

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

    - #### setUI

          public void setUI(SpinnerUI ui)

      Sets the look and feel (L&F) object that renders this component.
      Parameters:
        `ui` - the `SpinnerUI` L&F object
      See Also:
        `UIDefaults.getUI(javax.swing.JComponent)`

    - #### 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 "SpinnerUI"
      See Also:
        `JComponent.getUIClassID()`, `UIDefaults.getUI(javax.swing.JComponent)`

    - #### updateUI

          public void updateUI()

      Resets the UI property with the value from the current look and feel.
      Overrides:
        `updateUI` in class `JComponent`
      See Also:
        `UIManager.getUI(javax.swing.JComponent)`

    - #### createEditor

          protected JComponent createEditor(SpinnerModel model)

      This method is called by the constructors to create the `JComponent` that displays the current value of the sequence. The editor may also allow the user to enter an element of the sequence directly. An editor must listen for `ChangeEvents` on the `model` and keep the value it displays in sync with the value of the model.

      Subclasses may override this method to add support for new `SpinnerModel` classes. Alternatively one can just replace the editor created here with the `setEditor` method. The default mapping from model type to editor is:

      - `SpinnerNumberModel => JSpinner.NumberEditor`
      - `SpinnerDateModel => JSpinner.DateEditor`
      - `SpinnerListModel => JSpinner.ListEditor`
      - all others => `JSpinner.DefaultEditor`
      Parameters:
        `model` - the value of getModel
      Returns:
        a component that displays the current value of the sequence
      See Also:
        `getModel()`, `setEditor(javax.swing.JComponent)`

    - #### setModel

          public void setModel(SpinnerModel model)

      Changes the model that represents the value of this spinner. If the editor property has not been explicitly set, the editor property is (implicitly) set after the `"model"` `PropertyChangeEvent` has been fired. The editor property is set to the value returned by `createEditor`, as in:

           setEditor(createEditor(model));

      Parameters:
        `model` - the new `SpinnerModel`
      Throws:
        `IllegalArgumentException` - if model is `null`
      See Also:
        `getModel()`, `getEditor()`, `setEditor(javax.swing.JComponent)`

    - #### getModel

          public SpinnerModel getModel()

      Returns the `SpinnerModel` that defines this spinners sequence of values.
      Returns:
        the value of the model property
      See Also:
        `setModel(javax.swing.SpinnerModel)`

    - #### getValue

          public Object getValue()

      Returns the current value of the model, typically this value is displayed by the `editor`. If the user has changed the value displayed by the `editor` it is possible for the `model`'s value to differ from that of the `editor`, refer to the class level javadoc for examples of how to deal with this.

      This method simply delegates to the `model`. It is equivalent to:

           getModel().getValue()

      See Also:
        `setValue(java.lang.Object)`, `SpinnerModel.getValue()`

    - #### setValue

          public void setValue(Object value)

      Changes current value of the model, typically this value is displayed by the `editor`. If the `SpinnerModel` implementation doesn't support the specified value then an `IllegalArgumentException` is thrown.

      This method simply delegates to the `model`. It is equivalent to:

           getModel().setValue(value)

      Throws:
        `IllegalArgumentException` - if `value` isn't allowed
      See Also:
        `getValue()`, `SpinnerModel.setValue(java.lang.Object)`

    - #### getNextValue

          public Object getNextValue()

      Returns the object in the sequence that comes after the object returned by `getValue()`. If the end of the sequence has been reached then return `null`. Calling this method does not effect `value`.

      This method simply delegates to the `model`. It is equivalent to:

           getModel().getNextValue()

      Returns:
        the next legal value or `null` if one doesn't exist
      See Also:
        `getValue()`, `getPreviousValue()`, `SpinnerModel.getNextValue()`

    - #### addChangeListener

          public void addChangeListener(ChangeListener listener)

      Adds a listener to the list that is notified each time a change to the model occurs. The source of `ChangeEvents` delivered to `ChangeListeners` will be this `JSpinner`. Note also that replacing the model will not affect listeners added directly to JSpinner. Applications can add listeners to the model directly. In that case is that the source of the event would be the `SpinnerModel`.
      Parameters:
        `listener` - the `ChangeListener` to add
      See Also:
        `removeChangeListener(javax.swing.event.ChangeListener)`, `getModel()`

    - #### removeChangeListener

          public void removeChangeListener(ChangeListener listener)

      Removes a `ChangeListener` from this spinner.
      Parameters:
        `listener` - the `ChangeListener` to remove
      See Also:
        `fireStateChanged()`, `addChangeListener(javax.swing.event.ChangeListener)`

    - #### getChangeListeners

          public ChangeListener[] getChangeListeners()

      Returns an array of all the `ChangeListener`s added to this JSpinner 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()

      Sends a `ChangeEvent`, whose source is this `JSpinner`, to each `ChangeListener`. When a `ChangeListener` has been added to the spinner, this method method is called each time a `ChangeEvent` is received from the model.
      See Also:
        `addChangeListener(javax.swing.event.ChangeListener)`, `removeChangeListener(javax.swing.event.ChangeListener)`, `EventListenerList`

    - #### getPreviousValue

          public Object getPreviousValue()

      Returns the object in the sequence that comes before the object returned by `getValue()`. If the end of the sequence has been reached then return `null`. Calling this method does not effect `value`.

      This method simply delegates to the `model`. It is equivalent to:

           getModel().getPreviousValue()

      Returns:
        the previous legal value or `null` if one doesn't exist
      See Also:
        `getValue()`, `getNextValue()`, `SpinnerModel.getPreviousValue()`

    - #### setEditor

          public void setEditor(JComponent editor)

      Changes the `JComponent` that displays the current value of the `SpinnerModel`. It is the responsibility of this method to disconnect the old editor from the model and to connect the new editor. This may mean removing the old editors `ChangeListener` from the model or the spinner itself and adding one for the new editor.
      Parameters:
        `editor` - the new editor
      Throws:
        `IllegalArgumentException` - if editor is `null`
      See Also:
        `getEditor()`, `createEditor(javax.swing.SpinnerModel)`, `getModel()`

    - #### getEditor

          public JComponent getEditor()

      Returns the component that displays and potentially changes the model's value.
      Returns:
        the component that displays and potentially changes the model's value
      See Also:
        `setEditor(javax.swing.JComponent)`, `createEditor(javax.swing.SpinnerModel)`

    - #### commitEdit

          public void commitEdit()
                          throws ParseException

      Commits the currently edited value to the `SpinnerModel`.

      If the editor is an instance of `DefaultEditor`, the call if forwarded to the editor, otherwise this does nothing.

      Throws:
        `ParseException` - if the currently edited value couldn't be committed.

    - #### getAccessibleContext

          public AccessibleContext getAccessibleContext()

      Gets the `AccessibleContext` for the `JSpinner`
      Specified by:
        `getAccessibleContext` in interface `Accessible`
      Overrides:
        `getAccessibleContext` in class `Component`
      Returns:
        the `AccessibleContext` for the `JSpinner`
      Since:
        1.5

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