Binary tree implementation in java <<<<<<<<<<<<<<<<<BinaryTreeNode.java>>>>>>>>>>>>>>>>>>>>>>> public class BinaryTreeNode { private int key; private BinaryTreeNode leftLink; private BinaryTreeNode rightLink; public void setKey(int key) { this.key = key; } public int getKey() { return this.key; } public void setLeftLink(BinaryTreeNode bNode) { this.leftLink = bNode; } public void setRightLink(BinaryTreeNode bNode) { this.rightLink = bNode; } public BinaryTreeNode ...