读取文件内容，从第startLine行开始，读取lineCount行 @param file @param startLine @param lineCount @return 读到文字的list,如果list.size<lineCount则说明读到文件末尾了
(File file, int startLine, int lineCount)
source not stored for this graph (policy: none)
nothing calls this directly
no outgoing calls
no test coverage detected