LAF可以随意忽略某些(仅可见的?不知道的)JComponent属性的自定义设置，

LAFs are free to ignore custom settings of some (visual only? don't know) JComponent properties, as documented f.i.:

外观和感觉取决于该属性，有些人可能会选择忽略它.

It is up to the look and feel to honor this property, some may choose to ignore it.

因此，结果是高度依赖LAF的(Metal和Motif中的Worksforme，而不是Nimbus/Win中)没有简单，安全的方法(调整ui委托除外，这不是一个真正的选择)

So the outcome is highly LAF-dependent (Worksforme in Metal and Motif, not in Nimbus/Win) No easy and safe way around (except tweaking the ui delegate, which isn't a real option)