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Classes and Interfaces javaxswingevent ListSelectionEvent javaxswingevent ListSelectionListener javaxswingJList void valueChanged(ListSelectionEvent le) void addListSelectionListener( ListSelectionListener lsl) int getSelectedIndex( ) int[ ] getSelectedIndices( ) void setSelectionMode(int mode) Methods
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JList is Swing s basic list class It supports the selection of one or more items from a list Although often the list consists of strings, it is possible to create a list of just about any object that can be displayed JList is so widely used in Swing GUIs that it is highly unlikely that you have not seen one before This recipe shows how to create and manage one
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Using a JList involves these steps: 1 Create a JList instance 2 If necessary, set the selection mode by calling setSelectionMode( ) 3 Handle list selection events by registering a ListSelectionListener for the list List selection events are generated each time the user makes or changes a selection 4 For single-selection lists, obtain the index of a selection by calling getSelectedIndex( ) For multiple-selection lists, obtain an array containing the indices of all selected items by calling getSelectedIndices( )
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JList provides several constructors The one used here is: JList(Object[ ] items) This creates a JList that contains the items in the array specified by items In this recipe, the items are instances of String, but you can specify other objects JList uses javaxswingListModel as its data model javaxswingListSelectionModel is the model that governs list selections Although a JList will work properly by itself, most of the time you will wrap a JList inside a JScrollPane, which is a container that automatically provides scrolling for its contents
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Swing
(See Use JScrollPane to Handle Scrolling for details) Here is the JScrollPane constructor used by this recipe: JScrollPane(Component comp) Here, comp specifies the component to be scrolled, which in this case will be a JList By wrapping a JList in a JScrollPane, long lists will automatically be scrollable This simplifies GUI design It also makes it easy to change the number of entries in a list without having to change the size of the JList component A JList generates a ListSelectionEvent when the user makes or changes a selection This event is also generated when the user deselects an item It is handled by implementing ListSelectionListener, which is packaged in javaxswingevent This listener specifies only one method, called valueChanged( ), which is shown here void valueChanged(ListSelectionEvent le) Here, le is a reference to the object that generated the event ListSelectionEvent is also packaged in javaxswingevent Although ListSelectionEvent does provide some methods of its own, normally you will obtain information about a list selection by using methods defined by JList By default, a JList allows the user to select multiple ranges of items within the list, but you can change this behavior by calling setSelectionMode( ), which is defined by JList It is shown here void setSelectionMode(int mode) Here, mode specifies the selection mode It must be one of the values defined by its model, which is defined by javaxswingListSelectionModel They are shown here: SINGLE_SELECTION SINGLE_INTERVAL_SELECTION MULTIPLE_INTERVAL_SELECTION The default, multiple-interval selection lets the user select multiple ranges of items within a list With single-interval selection, the user can select one range of items With single selection, the user can select only a single item Of course, a single item can be selected in the other two modes, too It s just that they also allow a range to be selected You can obtain the index of the first item selected, which will also be the index of the only selected item when using single-selection mode, by calling getSelectedIndex( ), shown here: int getSelectedIndex( ) Indexing begins at zero So, if the first item is selected, this method will return 0 If no item is selected, 1 is returned You can obtain an array containing all selected items by calling getSelectedIndices( ), shown next: int[ ] getSelectedIndices( ) In the returned array, the indices are in order from smallest to largest If a zero-length array is returned, it means that no items are selected
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