e777. 获得JList组件的所有项

   // 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

    }

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e777. 获得JList组件的所有项

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