JExcel is a library for integrating Microsoft Excel into Swing applications and for working with Excel workbooks and worksheets from Java programs. JExcel functionality can be divided into the following main parts: - Automation of an Excel application, workbooks, worksheets, etc. This is the core functionality of the JExcel library that allows working with Excel applications, workbooks, worksheets, ranges and cells. - Embedding a workbook in a Java Swing application. JExcel provides the JWorkbook component that allows embedding an Excel workbook in a Java Swing application as an ordinary Swing component. - Handling Excel workbook or worksheet events. Workbook and Worksheet JExcel classes allow adding listeners for events generated by a workbook or worksheet and event handlers to affect the application behavior. - Working with native peers. Native peers are provided to allow you to add custom functionality based on JExcel.