Welcome back to an exciting journey into the world of Java! Today's itinerary includes "Function Chaining," the practice of calling a function within another and handling multiple return values using Java's List class. Picture nested matryoshka dolls and a multi-handled briefcase, and you'll grasp the concepts!

Let's demystify "Function Chaining". Have you ever prepared a cup of coffee? You sequentially boil water, brew coffee, and add cream. Now, imagine these steps as functions: doubleNumber() and addFive(). If we chain these functions together, we have our doubleAndAddFive() function — an apt illustration of function chaining!

Take a look:

In doubleAndAddFive(), doubleNumber() is called first, and then its result fuels addFive(). That's function chaining!

Now, let's dip our toes into function chaining. Consider the task of finding the square root of the sum of two numbers. We call inside , feeding its result to .