Understanding Guava Lists.transform()

Guava is a wonderful library by Google. Before Java 8 Guava was one of the best ways to use functional programming in Java.

I’ve being using Guava in one of my projects and came accross an strance issue reasontly. I had a list of items and I wanted to convert them to different object and filter some of those items.

After filtering I was changing some values in the list items. But what was strange was thay when I printed the list back it was not showing the changed value. It was still showing the original value. Code would look something similar to below.

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