Java语言词法分析器的设计与实现
其中具体要求：
1.使用DFA实现词法分析器的设计；
2.实现对Java源程序中注释的过滤；
3.利用两对半缓冲区从文件中逐一读取单词；
4.词法分析结果属性字流存放在独立文件[文件名：scanner_output]中；
5.统计源程序每行单词的个数和整个源文件单词个数；
6.具有报告词法错误和出错位置（源程序行号和该行字符）的功能；
,Lexical analyzer Java language design and implementation
One of the specific requirements:
1. The use of DFA realize the design of lexical analyzer　
2. Implementation of the Java source program annotated filtration　
3. The use of two pairs of semi-buffer read from the file one by one word　
4. Lexical analysis of word flow property stored in a separate document [file name: scanner_output] Medium　
5. Statistical source of the number of words per line and the entire source file number word　
6. With the report of lexical error and error location [source code line number and the character] of the function