统计某目录下的所有文本文件的单词出现频率。支持大驼峰和小驼峰命名的单词组合拆分，例如：void setName(name);或者void SetName(Name);将被分解成4个单词。只支持英文单词，一个字母的单词将忽略。可自行定义排名前几的数据。可自定义扫描的文件类型。
在大小写敏感模式下，统计某Java源码目录的结果
| 排名 | 单词 | 出现频率 |
|---|---|---|
| 1 | the | 311620 |
| 2 | if | 160965 |
| 3 | int | 147354 |
| 4 | to | 124752 |
| 5 | ud | 122707 |
| 6 | return | 120929 |
| 7 | is | 103377 |
| 8 | of | 97253 |
| 9 | public | 82258 |
| 10 | code | 80901 |
| 11 | get | 80374 |
| 12 | in | 78338 |
| 13 | this | 72584 |
| 14 | for | 66639 |
| 15 | void | 66632 |
| 16 | const | 65662 |
| 17 | String | 61459 |
| 18 | and | 60536 |
| 19 | static | 58577 |
| 20 | be | 52238 |
| 21 | new | 52176 |
| 22 | value | 50750 |
| 23 | set | 48107 |
| 24 | define | 46341 |
| 25 | or | 44280 |
| 26 | final | 44272 |
| 27 | The | 43007 |
| 28 | null | 40870 |
| 29 | param | 39200 |
| 30 | ua | 35429 |
| 31 | Exception | 35177 |
| 32 | not | 33046 |
| 33 | that | 32959 |
| 34 | with | 31674 |
| 35 | char | 31605 |
| 36 | private | 30663 |
| 37 | name | 30092 |
| 38 | by | 28578 |
| 39 | else | 28552 |
| 40 | on | 27356 |
| 41 | data | 27117 |
| 42 | link | 26914 |
| 43 | type | 26831 |
| 44 | length | 26330 |
| 45 | an | 25982 |
| 46 | License | 25953 |
| 47 | class | 25941 |
| 48 | android | 24778 |
| 49 | udc | 24752 |
| 50 | Code | 24273 |
| 51 | This | 24032 |
| 52 | ude | 23355 |
| 53 | key | 22997 |
| 54 | from | 22842 |
| 55 | are | 22709 |
| 56 | Object | 22363 |
| 57 | result | 22353 |
| 58 | Unicode | 22143 |
| 59 | import | 22070 |
| 60 | as | 21689 |
| 61 | it | 21530 |
| 62 | td | 21388 |
| 63 | size | 21351 |
| 64 | Array | 20837 |
| 65 | status | 20546 |
| 66 | file | 20100 |
| 67 | case | 20058 |
| 68 | udd | 19954 |
| 69 | Type | 19706 |
| 70 | index | 19660 |
| 71 | View | 19528 |
| 72 | use | 19258 |
| 73 | include | 18985 |
| 74 | Name | 18622 |
| 75 | object | 18118 |
| 76 | start | 18109 |
| 77 | boolean | 17693 |
| 78 | Value | 17223 |
| 79 | will | 16990 |
| 80 | out | 16947 |
| 81 | error | 16763 |
| 82 | Set | 16560 |
| 83 | may | 16362 |
| 84 | To | 16344 |
| 85 | string | 16319 |
| 86 | err | 16081 |
| 87 | true | 15680 |
| 88 | throws | 15655 |
| 89 | endif | 15619 |
| 90 | unsigned | 15532 |
| 91 | long | 15313 |
| 92 | udf | 15279 |
| 93 | at | 15106 |
| 94 | ctx | 14984 |
| 95 | State | 14939 |
| 96 | Info | 14749 |
| 97 | If | 14680 |
| 98 | block | 14453 |
| 99 | false | 14434 |
| 100 | used | 14247 |