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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 8 行

If a component container 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.