Explanation: The DefaultMutableTreeNode is a class defi ned in the package javax.swing.
tree . Instances of this class are general-purpose node in a tree data structure. DefaultMutableTree
Node provides operations for examining and modifying a node’s parent and children and also operations
for examining the tree that the node is a part of. A node’s tree is the set of all nodes that can be reached by
starting at the node and following all the possible links to parents and children. A node with no parent is the
root of its tree; a node with no children is a leaf.
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