calculateSurfaceAreaCylinder()

Step 1: Understand the Problem

In order to calculate the surface area of a cylinder, we must understand the formula for this calculation. The general formula for the surface area of a cylinder is 2 * PI * radius * (radius + height).

Step 2: Define the Function

In Java, we'd start by defining a method that takes in two parameters: radius and height. This method will return the calculated surface area of a cylinder.

public static double calculateSurfaceAreaCylinder(double radius, double height) {
// Returns the calculated surface area
}

Step 3: Implement the Formula

Next, we'll insert our formula into the function. We use the Math.PI constant from the Math class for PI and the multiplication operator * to apply the formula.

public static double calculateSurfaceAreaCylinder(double radius, double height) {
    return 2 * Math.PI * radius * (radius + height);
}

Step 4: Testing the Function

To make sure our function works correctly, we can test it by giving some inputs. If a cylinder has a radius of 3 units and a height of 4 units, for example, the function should return about 131.948 square units.

public static void main(String[] args) {
    System.out.println(calculateSurfaceAreaCylinder(3, 4));  
}

Step 5: Conclusion

And there you have it! You've now written a Java function to calculate the surface area of a cylinder given its radius and height.

The final code should look like the following:

public static double calculateSurfaceAreaCylinder(double radius, double height) {
    return 2 * Math.PI * radius * (radius + height);
}

public static void main(String[] args) {
    System.out.println(calculateSurfaceAreaCylinder(3, 4));  
}