Context: I created a BinarySearchTree class in Java as a learning exercise since I'm new to Java. I'm currently writing a method for a level-order traversal (BFS) that returns a list of lists of node values for each level, where the top-level list index represents the level number and the lower-level list at each index contains the node values for that level, e.g. for this tree: I created a BinarySearchTree class in
阅读背景：
BST Level Order Traversal list.clear（）和list = new ArrayList
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