CC-12 : Implement a simple shopping car POC. The order of adding items to the shopping cart should be preserved.

Description:

Implement a simple shopping cart POC where the order of adding items to the car is preserved. Assume only 1 quantity of a particular item can be added to the cart.

Test cases and expected outputs:

Input Parameters	Expected outputs
SetSimpleShoppingCart sCart=new SetSimpleShoppingCart(); sCart.addToCart("Nike Shoes Size 8 Quantity 1");	The shopping cart contents: 1 Nike Shoes Size 8 Quantity 1
sCart.addToCart("Nike TShirt Color TEAL Size M Quantity 1");	The shopping cart contents: 1 Nike Shoes Size 8 Quantity 1 2 Nike TShirt Color TEAL Size M Quantity 1
sCart.addToCart("Nike Deo Quantity 1");	The shopping cart contents: 1 Nike Shoes Size 8 Quantity 1 2 Nike TShirt Color TEAL Size M Quantity 1 3 Nike Deo Quantity 1
sCart.removeItem("Nike TShirt Color TEAL Size M Quantity 1");	The shopping cart contents: 1 Nike Shoes Size 8 Quantity 1 2 Nike Deo Quantity 1
sCart.addToCart("Nike TShirt Color BLUE Size M Quantity 1");	TThe shopping cart contents: 1 Nike Shoes Size 8 Quantity 1 2 Nike Deo Quantity 1 3 Nike TShirt Color BLUE Size M Quantity 1

Pseudocode:

Create a java class called SetSimpleShoppingCart.

In SetSimpleShoppingCart object initialize a member variable sCart of type LinkedHashSet. Note that a LinkedHashSet preserves the order in which elements are added to it.

Create a method addToCart() that takes an item as input:

In the method add item to sCart.

Create a method removeItem() that takes an item as input:

Remove item from sCart.

Create a method printCartContents() that iterates through sCart and prints the contents of the shopping cart. Since we have used a LinkedHashSet, the order in which items are added to cart are preserved while printing the shopping cart’s contents.

Code:

public class SetSimpleShoppingCart {
	
	LinkedHashSet<String> sCart=new LinkedHashSet<String>();
		
	public void addToCart(String item) {
		sCart.add(item);
	}
		


	public boolean removeItem(String item) {
		return sCart.remove(item);
	}


	public void printCartContents(){
		ArrayList aCart=new ArrayList(sCart);
		Iterator itr=aCart.iterator();
		System.out.print("\nThe shopping cart  contents: ");
		int itemCnt=1;
		while (itr.hasNext()) {
			System.out.print("\n" + itemCnt+ " "+itr.next()+ " ");
			itemCnt++;
		}	
		System.out.println("\n");
	}
}

Click here to download and run code and test cases !

Below fully running code can be copied and run on Eclipse or other Java IDEs. Refer the classname in code below. If the class name below is "A", save the code below to a file named A.java before running it. Be sure to try your own test cases to enhance your understanding ! You can also tweak the code to optimize or add enhancements and custom features.

import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashSet;




public class SetSimpleShoppingCart {
	
	LinkedHashSet<String> sCart=new LinkedHashSet<String>();
		
	public void addToCart(String item) {
		sCart.add(item);
	}
		


	public boolean removeItem(String item) {
		return sCart.remove(item);
	}


	public void printCartContents(){
		ArrayList aCart=new ArrayList(sCart);
		Iterator itr=aCart.iterator();
		System.out.print("\nThe shopping cart  contents: ");
		int itemCnt=1;
		while (itr.hasNext()) {
			System.out.print("\n" + itemCnt+ " "+itr.next()+ " ");
			itemCnt++;
		}	
		System.out.println("\n");
	}
		
		

		
public static void main(String[] args) {
			
	SetSimpleShoppingCart sCart=new SetSimpleShoppingCart();
	String[] retVal;
	try {
	System.out.println("Adding: "+"Nike Shoes Size 8 Quantity 1");
	sCart.addToCart("Nike Shoes Size 8 Quantity 1");
	sCart.printCartContents();
	System.out.println("Adding: "+"Nike TShirt Color TEAL Size M Quantity 1");
	sCart.addToCart("Nike TShirt Color TEAL Size M Quantity 1");
	sCart.printCartContents();
	System.out.println("Adding: "+"Nike Deo Quantity 1");
	sCart.addToCart("Nike Deo Quantity 1");
	sCart.printCartContents();
	System.out.println("Removing : "+"Nike TShirt Color TEAL Size M Quantity 1");
	sCart.removeItem("Nike TShirt Color TEAL Size M Quantity 1");
	sCart.printCartContents();
	System.out.println("Adding: "+ "Nike TShirt Color BLUE Size M Quantity 1");
	sCart.addToCart("Nike TShirt Color BLUE Size M Quantity 1");
	sCart.printCartContents();

	}catch (Exception exception) {
	System.out.print("Exception,"+ exception);
	exception.printStackTrace();
					
	}
}
				

}