Method minimum

lib/java/util/TreeMap.java:1411–1419

(Node<K, V> x)

    }

    static <K,V> Node<K, V> minimum(Node<K, V> x) {
        if (x == null) {
            return null;
        }
        while (x.left != null) {
            x = x.left;
        }
        return x;
    }

    static <K,V> Node<K, V> maximum(Node<K, V> x) {
        if (x == null) {