The Java Developers Almanac 1.4


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Home > List of Packages > javax.swing  [141 examples] > JList  [12 examples]

e777. Getting the Items in a JList Component

    // Create a list
    String[] items = {"A", "B", "C", "D"};
    JList list = new JList(items);
    
    // Get number of items in the list
    int size = list.getModel().getSize(); // 4
    
    // Get all item objects
    for (int i=0; i<size; i++) {
        Object item = list.getModel().getElementAt(i);
    }
These methods are used to find an item:
    // The prefix is case-insensitive
    String prefix = "b";
    
    // Search forward, starting from index 0, looking for an item that starts with "b"
    int start = 0;
    javax.swing.text.Position.Bias direction = javax.swing.text.Position.Bias.Forward;
    int itemIx = list.getNextMatch(prefix, start, direction);
    
    // Search backward, starting from the last item, looking for an item that starts with "b"
    start = list.getModel().getSize()-1;
    direction = javax.swing.text.Position.Bias.Backward;
    itemIx = list.getNextMatch(prefix, start, direction);
These methods can be used to find the range of visible items:
    // Get number of visible items
    int visibleSize = list.getVisibleRowCount();
    
    // Get index of first visible item
    itemIx = list.getFirstVisibleIndex();
    if (itemIx < 0) {
        // List is either not visible or there are no items
    }
    
    // Get index of last visible item
    itemIx = list.getLastVisibleIndex();
    if (itemIx < 0) {
        // List is either not visible or there are no items
    }

 Related Examples
e774. Creating a JList Component
e775. Setting the Dimensions of an Item in a JList Component
e776. Setting a Tool Tip for an Item in a JList Component
e778. Adding and Removing an Item in a JList Component
e779. Getting the Selected Items in a JList Component
e780. Setting the Selected Items in a JList Component
e781. Setting the Selection Mode of a JList Component
e782. Arranging Items in a JList Component
e783. Detecting Double and Triple Clicks on an Item in a JList Component
e784. Listening for Changes to the Selection in a JList Component
e785. Listening for Changes to the Items in a JList Component

See also: Actions    JButton    JCheckBox    JComboBox    JDesktop and JInternalFrame    JFrame, JWindow, JDialog    JLabel    JProgressBar    JRadioButton    JScrollPane    JSlider    JSpinner    JSplitPane    JTabbedPane    JToolBar    Keystrokes and Input Maps    Layout    Look and Feel    Menus    Progress Monitor    The Screen    Tool Tips    UI Default Values   


© 2002 Addison-Wesley.