Thread: Carpet Calculator Problem using aggregation

Hi this is what i am supposed to do:
RoomDimension: First, you should create a class named RoomDimension that has two fields: one for the length of the room, and one for the width. The RoomDimension class should have a method that returns the area of the room.

RoomCarpet : Next you should create a RoomCarpet class that has a RoomDimension object as a field. It should also have a field for the cost of the carpet per square foot. The RoomCarpet class should have a method that returns the total cost of the carpet. Use the UML diagram in figure 9-21 (pg. 599) as a guide to creating these classes.

RoomPriceDemo : Finally, you will create a RoomPriceDemo application program that asks the user to enter:
• the dimensions of a room
• and the price per square foot of the desired carpet
Your program should then calculate and display the total cost of the carpet.

here is my code:

HTML Code:

package Program_5;

public class RoomDimensions {

private int roomLength=0;
private int roomWidth=0;

public void setRoomLength(int roomlength) {
this.roomLength = roomlength;
}

public void setRoomWidth(int roomwidth) {
this.roomWidth = roomwidth;
}

public RoomDimensions() {


}

public int getRoomArea() {


return roomLength*roomWidth;
}

}

Other class

HTML Code:

package Program_5;

public class RoomCarpet{ 
private RoomDimensions thisRoomDimension;

final int carpetUnitCost=8;

public void setRoomDimension(RoomDimensions thisroomdimension) {
this.thisRoomDimension = thisroomdimension;

}

public int getTotalAMount()
{

return thisRoomDimension.getRoomArea()* carpetUnitCost;

}


}

Here is my demo:

HTML Code:

package Program_5;
import java.util.Scanner;
public class RoomPriceDemo {

	
	public static void main(String[] args) {
		int roomLength;
		int roomWidth;
		//Create Scanner object
		Scanner keyboard= new Scanner(System.in);
		System.out.println("Enter The Length Of The Room");
		roomLength= keyboard.nextInt();

		System.out.println("Enter The Width Of The Room");
		roomWidth = keyboard.nextInt();

		RoomDimensions roomd = new RoomDimensions();
		roomd.setRoomLength(roomLength);
		roomd.setRoomWidth(roomWidth);
		//instantiating carpet class
		RoomCarpet room1 = new RoomCarpet();
		//function call to set dimensions
		room1.setRoomDimension(roomd);
		//displaying data
		System.out.println("Room dimensions: ");
		System.out.println("Length: " + roomLength + " Width: " + roomWidth + 
		"Area: " + room1.getRoomArea());
		System.out.println("Carpet cost:$" + room1.getTotalAMount());

	}

}

my problem is my room1.getRoomArea()); print statement is not working. everything else seems correct but when i try and run it it gives me an error at the room1.getRoomArea()): method in the System.out.println is underlined red and that is the only problem i have and cant figure out how to fix it