Welcome! Today, we'll delve into Data Projection Techniques in Java! Data projection is akin to using a special light to make diamonds shine brighter amidst other gems, aiding in their identification.

This lesson will illuminate the concept of data projection, its implementation using Java's Stream API map() method, and how to integrate it with filtering. Let's forge ahead!

Data projection involves applying a function to the elements of a data stream, resulting in a reshaped view. A common instance of data projection is selecting specific fields from datasets.

Data projection in Java employs the map() method from the Stream API. You can define a reusable function to calculate each number's square or directly embed the logic within map() for a single use. Here's an illustration:

Use UnaryOperator for reusability in other code parts, or embed the logic directly inside map() if it’s a one-time operation.