e776. 设置JList组件项的提示语

   // Create a list, overriding the getToolTipText() method
    String[] items = {"A", "B", "C", "D"};
    JList list = new JList(items) {
        // This method is called as the cursor moves within the list.
        public String getToolTipText(MouseEvent evt) {
            // Get item index
            int index = locationToIndex(evt.getPoint());

            // Get item
            Object item = getModel().getElementAt(index);

            // Return the tool tip text
            return "tool tip for "+item;
        }
    };

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