Define an Index Tree class such that each node has data fields to store a word, the count of occurrences of that word in a document file, and the line number for each occurrence. Use an Array List to store the line numbers. Use an Index Tree object to store an index of words appearing in a text file, and then display the index by performing an inorder traversal of this tree. Define an Index Tree class such that each node has data fields to store a word, the count of occurrences of that word in a document file, and the line number for each occurrence. Use an Array List to store the line numbers. Use an Index Tree object to store an index of words appearing in a text file, and then display the index by performing an inorder traversal of this tree