# Interface SingleSelectionModel

All Known Implementing Classes:
  `DefaultSingleSelectionModel`

public interface SingleSelectionModel
A model that supports at most one indexed selection.

Since:
  1.2

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `addChangeListener(ChangeListener listener)`
  Adds listener as a listener to changes in the model.
  `void`
  `clearSelection()`
  Clears the selection (to -1).
  `int`
  `getSelectedIndex()`
  Returns the model's selection.
  `boolean`
  `isSelected()`
  Returns true if the selection model currently has a selected value.
  `void`
  `removeChangeListener(ChangeListener listener)`
  Removes listener as a listener to changes in the model.
  `void`
  `setSelectedIndex(int index)`
  Sets the model's selected index to index.

- ## Method Details

  - ### getSelectedIndex

    int getSelectedIndex()
    Returns the model's selection.
    Returns:
      the model's selection, or -1 if there is no selection
    See Also:
      - `setSelectedIndex(int)`

  - ### setSelectedIndex

    void setSelectedIndex(int index)
    Sets the model's selected index to index. Notifies any listeners if the model changes
    Parameters:
      `index` - an int specifying the model selection
    See Also:
      - `getSelectedIndex()`
      - `addChangeListener(ChangeListener)`

  - ### clearSelection

    void clearSelection()
    Clears the selection (to -1).

  - ### isSelected

    boolean isSelected()
    Returns true if the selection model currently has a selected value.
    Returns:
      true if a value is currently selected

  - ### addChangeListener

    void addChangeListener(ChangeListener listener)
    Adds listener as a listener to changes in the model.
    Parameters:
      `listener` - the ChangeListener to add

  - ### removeChangeListener

    void removeChangeListener(ChangeListener listener)
    Removes listener as a listener to changes in the model.
    Parameters:
      `listener` - the ChangeListener to remove