Hello and welcome! Today, we're exploring practical data manipulation techniques in Java. We'll use Java lists to represent our data stream and perform projection, filtering, and aggregation. And here's the star of the show: our operations will be neatly packaged within a Java class! No mess, all clean code.
Data manipulation is akin to being a sculptor but for data. We chisel and shape our data to get the desired structure. Java lists are perfect for this, and our operations will be conveniently bundled inside a Java class. So, let's get our toolbox ready! Here's a simple Java class, DataStream, that will serve as our toolbox:
Our first stop is data projection. Think of it like capturing a photo of our desired features. Suppose we have data about people. If we're only interested in names and ages, we project our data to include just these details. We'll extend our DataStream class with a projectData method for this:
