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The following program demonstrates a single-selection JList It presents a list of computer languages, from which the user may select one Each time a selection is made or changed, a ListSelectionEvent is generated, which is handled by the valueChanged( ) method defined by ListSelectionListener It responds by obtaining the index of the selected item and displaying the selection
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// Demonstrate a single-selection JList import import import import javaxswing*; javaxswingevent*; javaawt*; javaawtevent*;
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class ListDemo { JList jlst; JLabel jlab; JScrollPane jscrlp; // Create an array of computer languages String languages[] = { "Java", "Perl", "Python", "C++", "Basic", "C#" }; ListDemo() { // Create a new JFrame container JFrame jfrm = new JFrame("Use JList"); // Set the layout manager to FlowLayout jfrmsetLayout(new FlowLayout()); // Give the frame an initial size jfrmsetSize(200, 160); // Terminate the program when the user closes the application jfrmsetDefaultCloseOperation(JFrameEXIT_ON_CLOSE); // Create a JList jlst = new JList(languages); // Set the list selection mode to single-selection jlstsetSelectionMode(ListSelectionModelSINGLE_SELECTION); // Add the list to a scroll pane jscrlp = new JScrollPane(jlst); // Set the preferred size of the scroll pane jscrlpsetPreferredSize(new Dimension(100, 74)); // Make a label that displays the selection jlab = new JLabel("Choose a Language");
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// Add list selection handler jlstaddListSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent le) { // Get the index of the changed item int idx = jlstgetSelectedIndex(); // Display selection, if item was selected if(idx != -1) jlabsetText("Current selection: " + languages[idx]); else // Otherwise, reprompt jlabsetText("Please choose a language"); } }); // Add the list and label to the content pane jfrmadd(jscrlp); jfrmadd(jlab); // Display the frame jfrmsetVisible(true); } public static void main(String args[]) { // Create the frame on the event dispatching thread SwingUtilitiesinvokeLater(new Runnable() { public void run() { new ListDemo(); } }); } }
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Let s look closely at a few aspects of this program First, notice the languages array near the top of the program It is initialized with a list of strings that contains the names of various computer languages Inside ListDemo( ), a JList called jlst is constructed using the languages array This causes the list to be initialized to the strings contained in the array A second point of interest is the call to setSelectionMode( ) As explained, by default, JList supports multiple selections It must be explicitly set to allow only single selections Next, jlst is wrapped inside a JScrollPane, and the preferred size of the scroll pane is set to 100 by 74 The setPreferredSize( ) method sets the desired size of a component Be aware, however, that some layout managers will ignore this request Because the list contains only
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a few entries, it would have been possible in this case to avoid the use of a scroll pane However, the use of a scroll pane lets the list be presented in a compact form It also allows entries to be added to the list without affecting the layout of the GUI
Options and Alternatives
Another commonly used JList constructor lets you specify the items in the list in the form of a Vector It is shown here: JList(Vector< > items) The items contained in items will be shown in the list As explained, by default a JList allows multiple items to be selected from the list When using multiple selection, you will need to use getSelectedIndices( ) to obtain an array of the items selected For example, here is the valueChanged( ) handler from the example rewritten to support multiple selection:
// Handler for multiple selections jlstaddListSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent le) { String langs = "Current Selections: "; // Get the indices of the selected items int indices[] = jlstgetSelectedIndices(); // Display selection, if one or more items were selected if(indiceslength != 0) { for(int i = 0; i < indiceslength; i++) langs += languages[indices[i]] + " "; jlabsetText(langs); } else // Otherwise, reprompt jlabsetText("Please choose a language"); } });
To try this handler, you must also comment out the call to setSelectionMode( ) in the example You can select an item under program control by calling setSelectedIndex( ), shown here: void setSelectedIndex(int idx) Here, idx is the index of the item to be selected One reason you might want to use setSelectedIndex( ) is to preselect an item when the list is first displayed For example, try adding this line to the preceding program after jlst has been added to the content pane:
jlstsetSelectedIndex(0);
After making this addition, the first item in the list, which is Java, will be selected when the program starts
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