I need help understanding how to do this. If someone could make /otes within a Java code script explaining what is going on and why, that would be amazing! Thank you in advance.

This program will compute the cost of painting the walls and installing carpet in a room. Assume that the room has one door, two windows and one bookshelf that take up room on the walls and decrease the area of walls that needs to be painted. The bookshelf will also decrease the floor of the room. amount of carpet that will cover the Complete the following tasks: 1. Create a new java console application in IntelliJ, and name it CostCalculator 2. You will need to declare global variables that will hold all of the size information for windows, door, bookshelf and the room. main method "All input AND output should be done using the JOptionPane library utilized in class 3. The main method will only contain a single line of code that will call the first of several other methods. All you need to do is write the call to method 2 in main. Method 2: 4. Prompt the user to enter the length, width and height of the room that is to be painted and record that data in the appropriate global variables declared in step 2. 5. Call method 3. Method 3: 6. Prompt the user to enter the widths and heights, in feet, of the door and each window and record that data in the appropriate global variables declared in step 2. 7. Call method 4. Method 4: 8. Prompt the user for the width, height and depth the bookshelf and record that data in the appropriate global variables declared in step 2 9. Call method 5 Method 5: 10. Prompt the user to enter the cost, per square foot, of painting the walls and record that data in the appropriate global variables declared in step 2. 11. Prompt the user to enter the cost, per square foot, of installing carpet and record that data in the appropriate global variables declared in step 2. 12. Call the last method. Method 6: 13. Output the cost of painting the walls, the cost of installing the carpet and the total cost of the renovation