kwic_OO

代码说明：

  用面向对象的方法实现置换索引(KWIC)，即根据输入的一句英文，依次将句首的第一个单词移位到句尾。(Object-oriented methods to achieve permutation index (KWIC), that is based on the input sentence in English, followed by the first word in the first sentence of the shift to the end of the sentence.)