calculateSurfaceAreaCubeInSphere()

Step 1:

First, let's start by defining the function. This function will take the diameter of the sphere as a parameter, since the diameter of the sphere is equal to the edge of the cube. We'll call our function calculateSurfaceAreaOfCube.

public static double calculateSurfaceAreaOfCube(double diameter){}

Step 2:

Now, let's calculate the edge of the cube. As we established, this is simply equal to the diameter of the sphere. Let's introduce a new variable called edge to store this value.

public static double calculateSurfaceAreaOfCube(double diameter){
  double edge = diameter;
}

Step 3:

Surface area of a cube is calculated by the formula 6a^2 where 'a' is the length of the edge of the cube. So let's calculate the surface area, making use of the Math.pow function to square the edge.

public static double calculateSurfaceAreaOfCube(double diameter){
  double edge = diameter;
  double surfaceArea = 6 * Math.pow(edge, 2);
}

Step 4:

Finally, we just need to return the calculated surface area from the function. Adding a return statement will give us the final implementation of our function.

public static double calculateSurfaceAreaOfCube(double diameter){
  double edge = diameter;
  double surfaceArea = 6 * Math.pow(edge, 2);
  return surfaceArea;
}

Conclusion

The full code implementation calculates the surface area of a cube that's placed in a sphere. You simply need to call the function calculateSurfaceAreaOfCube with the diameter of the sphere as an argument, and it will return the surface area of the cube.