用java编一个红黑树

好的，请稍等，我会马上给您提供一个简单的Java实现红黑树的代码。

public class RedBlackTree<K extends Comparable<K>, V> {
    private Node root;

    private static final boolean RED = true;
    private static final boolean BLACK = false;

    private class Node {
        K key;
        V value;
        Node left, right;
        int size;
        boolean color;

        Node(K key, V value, int size, boolean color) {
            this.key = key;
            this.value = value;
            this.size = size;
            this.color = color;
        }
    }

    public void put(K key, V value) {
        root = put(root, key, value);
        root.color = BLACK;
    }

    private Node put(Node h, K key, V value) {
        if (h == null) return new Node(key, value, 1, RED);

        int cmp = key.compareTo(h.key);
        if (cmp < 0) h.left = put(h.left, key, value);
        else if (cmp > 0) h.right = put(h.right, key, value);
        else h.value = value;

        if (isRed(h.right) && !isRed(h.left)) h = rotateLeft(h);
        if (isRed(h.left) && isRed(h.left.left)) h = rotateRight(h);
        if (isRed(h.left) && isRed(h.right)) flipColors(h);

        h.size = size(h.left) + size(h.right) + 1;
        return h;
    }

    private boolean isRed(Node x) {
        if (x == null) return false;
        return x.color == RED;
    }

    private Node rotateLeft(Node h) {
        Node x = h.right;
        h.right = x.left;
        x.left = h;
        x.color = h.color;
        h.color = RED;
        x.size = h.size;
        h.size = size(h.left) + size(h.right) + 1;
        return x;
    }

    private Node rotateRight(Node h) {
        Node x = h.left;
        h.left = x.right;
        x.right = h;
        x.color = h.color;
        h.color = RED;
        x.size = h.size;
        h.size = size(h.left) + size(h.right) + 1;
        return x;
    }

    private void flipColors(Node h) {
        h.color = RED;
        h.left.color = BLACK;
        h.right.color = BLACK;
    }

    private int size(Node x) {
        if (x == null) return 0;
        return x.size;
    }
}

这个实现是一个基本的红黑树实现，有put方法用于插入元素，以及一些辅助的私有方法，包括rotateLeft, rotateRight, flipColors等等。请注意，这个实现可以按照任意顺序插入元素，甚至可以插入重复元素，并且在插入时会自动维护红黑树的颜色性质和大小信息。