Streams All of Java's I/O facilities are based on streams that represent flowing sequences of characters or bytes. Java's I/O streams provide standardized ways to read and write data.

How to convert an XLS file to CSV Let’s say you have the file clients.xlsx and you need it converted to clients.csv to be then uploaded as a client list in your new CRM tool.

How to Read an XLS File Without Excel. XLS files are spreadsheet files created by Microsoft Office Excel. An Excel spreadsheet can contain anything from images and plain text to graphs and tables ...