Question

package rectangle;

public class Rectangle {
   private int height;
   private int width;

   public Rectangle(int aHeight, int aWidth) {
   super();
   height = aHeight;
   width = aWidth;
   }

   public int getHeight() {
   return height;
   }

   public int getWidth() {
   return width;
   }

   public void setHeight(int aHeight) {
   height = aHeight;
   }

   public void setWidth(int aWidth) {
   width = aWidth;
   }

   public int computeArea() {
   return width * height;
   }

   public int compputeCircumference() {
   return 2 * (width + height);
   }
   }

package rectangle;

import java.util.Scanner;

public class RectangleApp {
   public static void main(String[] args) {
   Scanner sc = new Scanner(System.in);
   System.out.println("Enter height and width of Rectangle: ");
   Rectangle r = new Rectangle(sc.nextInt(), sc.nextInt());
   System.out.println("Area: "+r.computeArea());
   System.out.println("Circumference: "+r.compputeCircumference());
   }
   }

Currently, I have these two codes. One is to find the area of a rectangle, and the other is a driver. I have one error in the driver code, in the line " Scanner sc = new Scanner(System.in); ". the sc after Scanner is highlighted as incorrect, and my TA told me I didn't use the Scanner object "sc" you created. Can someone tell me how I can fix this?

Answer 1

Rectangle.java :

package rectangle;//package
//Java class
public class Rectangle {
   //instance variables
   private int height;
   private int width;
   //constructor with parameter
   public Rectangle(int aHeight, int aWidth) {
       super();
       height = aHeight;
       width = aWidth;
   }
   //getter methods
   public int getHeight() {
       return height;
   }

   public int getWidth() {
       return width;
   }
   //setter methods
   public void setHeight(int aHeight) {
       height = aHeight;
   }

   public void setWidth(int aWidth) {
       width = aWidth;
   }
   //method to computer area
   public int computeArea() {
       return width * height;//return area
   }
   //method to calculate circumference
   public int compputeCircumference() {
       return 2 * (width + height);//return circumference
   }
}

****************************************

RectangleApp.java :

package rectangle;//package
//import package
import java.util.Scanner;
//java class
public class RectangleApp {
   //entry point of the program, main() method
   public static void main(String[] args) {
       //object of Scanner class
       Scanner sc = new Scanner(System.in);
       //using try
       try {
           //asking height and width
           System.out.println("Enter height and width of Rectangle: ");
           //creating object of Rectangle and passing height and width
           Rectangle r = new Rectangle(sc.nextInt(), sc.nextInt());
           //method call to compute area
           System.out.println("Area: " + r.computeArea());
           //method call to compute Circumference
           System.out.println("Circumference: " + r.compputeCircumference());
       } finally {
           sc.close();//close Scanner
       }
   }
}

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Screen 1:RectangleApp.java