Finding best deal of mall program in java

[Vivek Jain]

Can anyone provide me this program?

Write a program to find best deal on a product in a shopping mall. Shops carry different products at different prices.

Main Requirements:
1.Mall data should be defined and read from an xml/flat file.
2.Allow entering product name on command line to find the best deal.
3.Print the store name, product name, and the price as a result on the console.
4.Program should continue with a prompt for the next product name. Word END should end the program.

Thanks in Advance!

[marc weber]

Originally posted by free phone:
Can anyone provide me this program? ...

No. But we can help you write it. What have you done so far, and where are you stuck?

("free phone," welcome to JavaRanch! Please check your private messages by clicking on My Private Messages. Thanks!)
[ October 17, 2007: Message edited by: marc weber ]

[Vivek Jain]

I've created XML file which conains data as shown below:
<Walmart>
<ProdInfo name="Shirt" price="$45">
<ProdInfo name="Pant" price="$45">
</Walmart>
<Kohls>
<ProdInfo name="Shirt" price="$35">
<ProdInfo name="Coat" price="$65">
</Kohls>

Now, I really don't know how to store them & how to compare for least values. Whether I should save them in hastable with Walmart_Shirt as key & value as its price for all the nodes, or how should I proceed?

Thanks!

[Stan James]

Instead of thinking about how to do it, think about what you want it to do first. That is, write some code that calls methods that don't exist yet and imagine how it would work. Maybe:

Product product = mall.findBestPriced( "Shirt" );
System.out.println( product.store );
System.out.println( product.price );

That gives some strong hints about how findBestPrice should work. You could make a first version that just says:

public findBestPriced( String name )
{
   return new Product( "Walmart", "Shirt", "$12.95" );
}

Seriously, make a test class and a Mall class that do no more than that. Show us what you make. Then we'll take the next step. This is a lot more fun than designing and writing hundreds of lines of code before you try and see how it works. Take tiny steps, keep it fun.

[Scott Selikoff]

"John Machlane"

Please review our naming policy again. In short, you may not pick names that are obviously fictiuous (yes, we've all see Die Hard).

[Jesper de Jong]

"John" - Your name is still not according to the JavaRanch policy.

Please check your private messages. You can see them by clicking My Private Messages.

[Sankari Palani]

Basic requirements:
Write your code in Java.
Program should run from command line.
There is no need to develop any GUI components, unless you think we will be impressed by it.


Problem
Write a program to find best deal on a product in a shopping mall. Shops carry different products at different prices.

Main Requirements:
1. Mall data should be defined and read from an xml/flat file.
2. Allow entering product name on command line to find the best deal.
3. Print the store name, product name, and the price as a result on the console.
4. Program should continue with a prompt for the next product name. Word END should end the program.

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Here is the answer

/**********************/
/*** ShoppingMall.java ***/
/**********************/

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import org.w3c.dom.*;

import java.io.File;
import org.w3c.dom.Document;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException; 


 
 


public class ShoppingMall  {
	public static void main( String[] args ) { 
	    Product[] 		product = null;
	    Mall			mall	= new Mall();
		String 			sInput	= "";		
	    BufferedReader 	br 		= new BufferedReader(new InputStreamReader(System.in)); //  open up standard input
	     
	    try { 
	    	do {   
			    if(args.length>0) {
					sInput = args[0];
			    } else {
					System.out.print("Enter product name or Enter End to quit: ");
					
					//  read the product name from the command-line; need to use try/catch with the
				    //  readLine() method
			    	sInput = br.readLine();
	
			    }
	
				if(sInput.equalsIgnoreCase("End"))
					System.exit(1); 
				
		    	//System.out.println("Input is : "+sInput);
			    product = mall.findBestPriced(sInput); 
			    for(int iCount=0; iCount < product.length; iCount++) { 
				    if((product[iCount].getIsProductAvailable()).equals("No") ) {
				    	 System.out.println("Entered Product not available! Try with another Product!!!");
				    }else {
				    	System.out.println("-----------------------------------------------------");
					    System.out.println("Product Name	= "+ product[iCount].getProductName());   
					    System.out.println("Best 	store	= "+ product[iCount].getStoreName());  
					    System.out.println("Best	Price	= "+ product[iCount].getPrice()); 
				    	System.out.println("-----------------------------------------------------"); 
				    }
	    		}
			}while(!sInput.equalsIgnoreCase("End")); 
	    } catch (IOException ioe) {
	         System.out.println("IO error trying to read product name!");
	         System.exit(1);
	    }  
	} 
}
 
class Product {
	public Product() {
	}
	
	private String sProductName;
	private String sStoreName;
	private String sPrice;
	private String sIsProductAvailable;
	

	public String getProductName() {
		return this.sProductName;
	}
	public String getStoreName() {
		return this.sStoreName;
	} 
	public String getPrice() {
		return this.sPrice;
	}  
	public String getIsProductAvailable() {
		return this.sIsProductAvailable;
	}  
	

	public String setProductName(String sProductName) {
		return this.sProductName = sProductName;
	}
	public String setStoreName(String sStoreName) {
		return this.sStoreName = sStoreName;
	} 
	public String setPrice(String sPrice) {
		return this.sPrice = sPrice;
	} 
	public String setIsProductAvailable(String sIsProductAvailable) {
		return this.sIsProductAvailable = sIsProductAvailable;
	}   
}


class Mall {
	public  Product[] findBestPriced(String sInputProductName) {
		Product[] prod 				= null; 
		String 	sProductName 		= "";
		String 	sStoreName			= "";
		String 	sPrice				= "";
		String 	sIsProductAvailable	= "";
		int 	totalStores 		= 0;
		
		DocumentBuilder 		dbXMLDocumentBuilder 			= null; 
		Document 				docXMLDocument 					= null;  
		DocumentBuilderFactory 	dbfXMLDocumentBuilderFactory 	= DocumentBuilderFactory.newInstance();
		

	
		
		try {
			dbXMLDocumentBuilder = dbfXMLDocumentBuilderFactory.newDocumentBuilder();
			docXMLDocument = dbXMLDocumentBuilder.parse("ProductDetails.xml"); 
			docXMLDocument.normalize();
			//System.out.println ("Root element of the doc is " +  docXMLDocument.getDocumentElement().getNodeName());
			
			NodeList listOfStores = docXMLDocument.getElementsByTagName("Store");
            totalStores = listOfStores.getLength();
            //System.out.println("Total no of Product : " + totalStores);
           
            prod 				= new Product[totalStores]; 
            
            for(int iCount=0; iCount<totalStores; iCount++){ 
            	
 
            	Node storeNode = listOfStores.item(iCount);
            	Element storeElement = (Element)storeNode;
            	 
            	
            	NodeList nSelectedProductList = storeElement.getElementsByTagName(sInputProductName);  
                Element prdElement = (Element)nSelectedProductList.item(0); 
                NodeList productList = prdElement.getChildNodes();
                 
            	
                NodeList nSelectedStoreList = storeElement.getElementsByTagName("StoreName");  
                Element storElement = (Element)nSelectedStoreList.item(0); 
                NodeList storList = storElement.getChildNodes();
                
                sPrice 				= ((Node)productList.item(0)).getNodeValue().trim();
                sStoreName    		= ((Node)storList.item(0)).getNodeValue().trim(); 
                sIsProductAvailable	= "Yes";
                
                prod[iCount] = new Product(); 
        		prod[iCount].setProductName(sInputProductName);
        		prod[iCount].setStoreName(sStoreName);
        		prod[iCount].setPrice(sPrice);
        		prod[iCount].setIsProductAvailable(sIsProductAvailable);
        		
 

	        }//end of for loop with iCount var
            
            
        }catch (SAXParseException err) {
        	System.out.println ("** Parsing error" ); 
        }catch (SAXException e) {
        	System.out.println ("**   error" );   
        }catch (Throwable t) {
        	t.printStackTrace ();
        } 
          
		
		return prod;
	}
}

/**********************/ /*** ProductDetails.xml ***/ /**********************/ ><PRODUCT> <Store> <StoreName> Walmart </StoreName> <Shirt> 45 </Shirt> <Pant> 45 </Pant> <Coat> 25 </Coat> </Store> <Store> <StoreName> Kohls </StoreName> <Shirt> 35 </Shirt> <Pant> 15 </Pant> <Coat> 65 </Coat> </Store> </PRODUCT>

[Campbell Ritchie]

Welcome to the Ranch

In view of this:

We're all here to learn, so when responding to others, please focus on helping them discover their own solutions, instead of simply providing answers.

. . . which is written at the top of this page, I would usually delete that solution. But after 4 years, maybe I can safely leave it. Please don’t post complete solutions again.

[Campbell Ritchie]

Just looking at your code, I can see some things I would change:

use of System.exit()

Indentation: you are using tab and space together. Always use spaces.

It looks a lot better (as you can see now I have changed it) if you use the code button Only there appears to be a fault which occasionally changes < to ><. Don’t know why.