Java 实现二叉树数据结构的程序

// class to create nodes
class Node {
  int key;
  Node left, right;
  public Node(int item) {
  key = item;
  left = right = null;
  }
}
class BinaryTree {
  Node root;
  // Traverse tree
  public void traverseTree(Node node) {
    if (node != null) {
      traverseTree(node.left);
      System.out.print(" " + node.key);
      traverseTree(node.right);
    }
  }
  public static void main(String[] args) {
    // create an object of BinaryTree
    BinaryTree tree = new BinaryTree();
    // create nodes of the tree
    tree.root = new Node(1);
    tree.root.left = new Node(2);
    tree.root.right = new Node(3);
    tree.root.left.left = new Node(4);
    System.out.print("\nBinary Tree: ");
    tree.traverseTree(tree.root);
  }
}

Binary Tree:  4 2 1 3