e774. 创建JList组件

Posted 2021-01-04 borter

By default, a list allows more than one item to be selected. Also, the selected items need not be contiguous. To change this default, see e781 设置JList中的选择模式.

A list selection event is fired when the set of selected items is changed (see e784 监听对JList选择变动).

    // Create a list with some items
    String[] items = {"A", "B", "C", "D"};
    JList list = new JList(items);

The items can be arbitrary objects. The toString() method of the objects is displayed in the list component.

    // Create a list with two items - "123" and "Sun May 19 21:15:38 PDT 2002"
    Object[] items2 = {new Integer(123), new java.util.Date()};
    list = new JList(items2);

By default, a list does not automatically display a scrollbar when there are more items than can be displayed. The list must be wrapped in a scroll pane:

    JScrollPane scrollingList = new JScrollPane(list);

 

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