Review

class UintMap {
    /** Return array of present keys */
    public int[] getKeys() {
        int[] keys = this.keys;
        int n = keyCount;
        int[] result = new int[n];
        for (int i = 0; n != 0; ++i) {
            int entry = keys[i];
            if (entry != EMPTY && entry != DELETED) {
                result[--n] = entry;
            }
        }
        return result;
    }

}