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来自「《Java2图形设计卷II：Swing》配套光盘源码」· 文本 代码 · 共 4 行

If a component is to be placed on a layer defined by one of the JLayeredPane constants listed in Figure 4, the integer value must be converted to an integer.

The combo box is fitted with an item listener that sets the tab placement depending upon the currently selected item in the combo box.