L13_BinaryTree - The Binary Tree ADT As we have been doing...

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The Binary Tree ADT As we have been doing, we shall define Binary Trees and Tree Nodes to be Abstract Data Types. f i n d M i n N o d e l e f t S u b t r e e r o o t Page 1 of 16
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* public interface TreeNode { public String getNodeKey(); public boolean equalTo(TreeNode N); } public interface BinaryTree { public TreeNode root(); public BinaryTree leftSubtree(); public BinaryTree rightSubtree(); public boolean isEmpty(); public boolean equalTo(BinaryTree t); public BinaryTree insertNode(TreeNode N); public TreeNode findMinNode(); public BinaryTree deleteNode(TreeNode N); } Page 2 of 16
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Implementation of the Tree Node ADT We consider tree nodes with character strings as keys, and objects as data. public class OrdinaryTreeNode implements TreeNode { private String key; private Object contents; "0123849" (data) } (data) 0123849 Page 3 of 16
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public class OrdinaryTreeNode implements TreeNode { private String key; private Object contents; public OrdinaryTreeNode(String k, Object c) { this.key = k; this.contents = c; } public String getNodeKey() { return this.key; } public boolean equalTo(TreeNode N) { return key.equals(N.getNodeKey()); /* Well , … */ "0123849" (data) } 0123849 (data) } Page 4 of 16
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