Question

Please use Java

Problem 1. Implement the Comparable interface of a class ShoppingItem. Each ShoppingItem contains a title and a weight in pounds. Design a tester class, and sorted a list of input ShoppingItem by their weight. The output should show the title and weight.

For testing, please use these inputs:

• Fitness equipment, 150 pounds
• TV screen, 50 pounds
• Apple watch, 0.1 pound
• Book, 0.5 pound
• Bag, 2 pound

Answer 1

import java.util.ArrayList;
import java.util.Collections;

class ShoppingItem implements Comparable{
private String title;
private double quantity;

   public ShoppingItem(String aTitle, double aQuantity) {
   super();
   title = aTitle;
   quantity = aQuantity;
}

   public String getTitle() {
       return title;
   }

   public void setTitle(String aTitle) {
       title = aTitle;
   }

   public double getQuantity() {
       return quantity;
   }

   public void setQuantity(double aQuantity) {
       quantity = aQuantity;
   }

   @Override
   public String toString() {
       return title + " , "+ quantity+" pounds";
   }

   @Override
   public int compareTo(Object aO) {
       //sorting based on the weight
       ShoppingItem item=(ShoppingItem)aO;
       return new Double(this.quantity).compareTo(new Double(item.getQuantity()));
   }
  
}
public class TestShoppingItem {
public static void main(String[] args) {
   ArrayList<ShoppingItem>list= new ArrayList<ShoppingItem>();
   list.add(new ShoppingItem("Fitness equipment",150));
   list.add(new ShoppingItem("Tv screen",50));
   list.add(new ShoppingItem("Apple watch",0.1));
   list.add(new ShoppingItem("Book",0.5));
   list.add(new ShoppingItem("Bag ",2));
   Collections.sort(list);
   for(ShoppingItem i:list)
       System.out.println(i);
  
  
}
}