UIDefaultspublic static interface UIDefaults.ActiveValue
getXXX(key) methods. Here's an example of an ActiveValue that constructs a DefaultListCellRenderer: 
  Object cellRendererActiveValue = new UIDefaults.ActiveValue() {
      public Object createValue(UIDefaults table) {
          return new DefaultListCellRenderer();
      }
  };
  uiDefaultsTable.put("MyRenderer", cellRendererActiveValue);
 
| Modifier and Type | Method | Description | 
|---|---|---|
| Object | createValue | Creates the value retrieved from the  UIDefaultstable. | 
Object createValue(UIDefaults table)
UIDefaults table. The object is created each time it is accessed.table - a UIDefaults tableObject
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    https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/UIDefaults.ActiveValue.html