Learn how to set and evaluate Excel formulas in Java with Apache POI. In this quick tutorial, we're going to talk about how we can set formulas in a Microsoft Excel spreadsheet using Apache POI through a simple example.
In this quick tutorial, we're going to talk about how we can set formulas in a Microsoft Excel spreadsheet **using [Apache POI**](https://poi.apache.org/)through a simple example.
Apache POI is a popular open-source Java library that provides programmers with APIs to create, modify, and display MS Office files.
In order to see Apache POI in action, we're going to set a formula to subtract the sum of the values in columns A and B in an Excel file. The linked file contains the data below:
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