The `getUserObject()` method of `DefaultMutableTreeNode` in Java's javax.swing.tree package is used to retrieve the object associated with the node. When creating a tree node, an object (user-defined or predefined) can be attached to it using the `DefaultMutableTreeNode(Object userObject)` constructor. This method allows accessing this user-defined object. By retrieving the user object, developers can access and manipulate any information related to the node, such as data values or references to other objects.
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