I need this in JAVA: I keep on getting errors and I don't know what I'm doing wrong

Problem 1: Well, it ain't a Picasso: A local painting company has asked you to create an algorithm to help them figure out how much paint they need for each job when they are giving estimates. A single gallon of paint will cover 400 square feet of wall. You need to ask the customer how many walls they need painted, the average height and width of each wall and what color paint they want used. After getting the inputs, your algorithm should determine and display the total square feet of the walls to be painted along with how many gallons of the desired color paint that the job would require. Note: Area of a rectangle is length * width so it would be height * width for a wall. Sample Output: How many walls would you need painted? 2 What is the average height? 10 What is the average width? 10 What color paint do you want? Purple Painted 200 ft^2 of wall the color Purple It took 0.5 gallons of paint