e781. 设置JList中的选择模式

 // The default mode is MULTIPLE_INTERVAL_SELECTION
    String[] items = {"A", "B", "C", "D"};
    JList list = new JList(items);

    // Get the current selection model mode
    int mode = list.getSelectionMode(); // MULTIPLE_INTERVAL_SELECTION

    // Only one item can be selected
    list.setSelectionMode(DefaultListSelectionModel.SINGLE_SELECTION);

    // The selected items must be in a contiguous range
    list.setSelectionMode(DefaultListSelectionModel.SINGLE_INTERVAL_SELECTION);

    // Multiple ranges of selected items are allowed
    list.setSelectionMode(DefaultListSelectionModel.MULTIPLE_INTERVAL_SELECTION);

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