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所有已知实现类：
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ActionMapUIResource,
BasicBorders.ButtonBorder,
BasicBorders.FieldBorder,
BasicBorders.MarginBorder,
BasicBorders.MenuBarBorder,
BasicBorders.RadioButtonBorder,
BasicBorders.RolloverButtonBorder,
BasicBorders.SplitPaneBorder,
BasicBorders.ToggleButtonBorder,
BasicComboBoxEditor.UIResource,
BasicComboBoxRenderer.UIResource,
BasicTextUI.BasicCaret,
BasicTextUI.BasicHighlighter,
BorderUIResource,
BorderUIResource.BevelBorderUIResource,
BorderUIResource.CompoundBorderUIResource,
BorderUIResource.EmptyBorderUIResource,
BorderUIResource.EtchedBorderUIResource,
BorderUIResource.LineBorderUIResource,
BorderUIResource.MatteBorderUIResource,
BorderUIResource.TitledBorderUIResource,
ColorUIResource,
ComponentInputMapUIResource,
DefaultListCellRenderer.UIResource,
DefaultMenuLayout,
DefaultTableCellRenderer.UIResource,
DimensionUIResource,
FontUIResource,
IconUIResource,
InputMapUIResource,
InsetsUIResource,
JScrollPane.ScrollBar,
MetalBorders.ButtonBorder,
MetalBorders.Flush3DBorder,
MetalBorders.InternalFrameBorder,
MetalBorders.MenuBarBorder,
MetalBorders.MenuItemBorder,
MetalBorders.OptionDialogBorder,
MetalBorders.PaletteBorder,
MetalBorders.PopupMenuBorder,
MetalBorders.RolloverButtonBorder,
MetalBorders.ScrollPaneBorder,
MetalBorders.TextFieldBorder,
MetalBorders.ToggleButtonBorder,
MetalBorders.ToolBarBorder,
MetalCheckBoxIcon,
MetalComboBoxEditor.UIResource,
MetalIconFactory.PaletteCloseIcon,
ScrollPaneLayout.UIResource
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public interface UIResource
此接口用于标记由 ComponentUI 委托创建的对象。ComponentUI.installUI() 和 ComponentUI.uninstallUI() 方法可以使用此接口确定属性值是否已经被重写。例如，JList cellRenderer 属性只在其初始值为 null 时由 BasicListUI.installUI() 初始化：
if (list.getCellRenderer() == null) {
list.setCellRenderer((ListCellRenderer)(UIManager.get("List.cellRenderer")));
}
在执行 uninstallUI() 时，如果该属性的值是 UIResource 的一个实例，则将该属性重置为 null：
if (list.getCellRenderer() instanceof UIResource) {
list.setCellRenderer(null);
}
此模式应用于除 java.awt.Component 属性 font、foreground 和 background 之外的所有属性。如果这些属性中有一个未被初始化，或者被显式设置为 null，则其容器将提供该值。因此，在调用 installUI() 来动态更新组件外观时，
"== null" 是不可靠的。因此，在执行 installUI() 时，要检查当前值是否是一个 UIResource：
if (!(list.getFont() instanceof UIResource)) {
list.setFont(UIManager.getFont("List.font"));
}
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另请参见：
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ComponentUI