用java代码实现一个二叉平衡树

好的，我可以回答这个问题。以下是一个简单的 Java 代码实现二叉平衡树的示例：

class Node {
    int value;
    int height;
    Node left;
    Node right;

    Node(int value) {
        this.value = value;
        this.height = 1;
    }
}

class AVLTree {
    Node root;

    int height(Node node) {
        if (node == null) {
            return 0;
        }
        return node.height;
    }

    int balanceFactor(Node node) {
        if (node == null) {
            return 0;
        }
        return height(node.left) - height(node.right);
    }

    Node rotateRight(Node y) {
        Node x = y.left;
        Node T2 = x.right;

        x.right = y;
        y.left = T2;

        y.height = Math.max(height(y.left), height(y.right)) + 1;
        x.height = Math.max(height(x.left), height(x.right)) + 1;

        return x;
    }

    Node rotateLeft(Node x) {
        Node y = x.right;
        Node T2 = y.left;

        y.left = x;
        x.right = T2;

        x.height = Math.max(height(x.left), height(x.right)) + 1;
        y.height = Math.max(height(y.left), height(y.right)) + 1;

        return y;
    }

    Node insert(Node node, int value) {
        if (node == null) {
            return new Node(value);
        }

        if (value < node.value) {
            node.left = insert(node.left, value);
        } else if (value > node.value) {
            node.right = insert(node.right, value);
        } else {
            return node;
        }

        node.height = 1 + Math.max(height(node.left), height(node.right));

        int balance = balanceFactor(node);

        if (balance > 1 && value < node.left.value) {
            return rotateRight(node);
        }

        if (balance < -1 && value > node.right.value) {
            return rotateLeft(node);
        }

        if (balance > 1 && value > node.left.value) {
            node.left = rotateLeft(node.left);
            return rotateRight(node);
        }

        if (balance < -1 && value < node.right.value) {
            node.right = rotateRight(node.right);
            return rotateLeft(node);
        }

        return node;
    }

    void preOrder(Node node) {
        if (node != null) {
            System.out.print(node.value + " ");
            preOrder(node.left);
            preOrder(node.right);
        }
    }

    public static void main(String[] args) {
        AVLTree tree = new AVLTree();

        tree.root = tree.insert(tree.root, 10);
        tree.root = tree.insert(tree.root, 20);
        tree.root = tree.insert(tree.root, 30);
        tree.root = tree.insert(tree.root, 40);
        tree.root = tree.insert(tree.root, 50);
        tree.root = tree.insert(tree.root, 25);

        System.out.println("Preorder traversal of constructed tree is : ");
        tree.preOrder(tree.root);
    }
}

这个代码实现了一个基本的 AVL 树，包括插入和旋转操作。在 `main` 方法中，我们创建了一个 AVL 树并插入了一些节点，然后使用前序遍历打印出树的结构。