ListOfProducts.java

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Scanner;
import java.util.TreeMap;

public class _09_ListOfProducts 
{
	public static void main(String[] args) throws FileNotFoundException, UnsupportedEncodingException 
	{				
		 	File text = new File("Input2.txt");
	        Scanner scan = new Scanner(text);       
	        Map<Double,String> map = new HashMap<Double,String>();
	        String product = "";
	        Double price = 0.0;

	        while(scan.hasNextLine())
	        {	  
	        	product = scan.next();
	        	price = scan.nextDouble();
	        	map.put(price,product);	 
	        }
	        scan.close();
	        TreeMap sortedMap = new TreeMap(map);
	        
	        Iterator<Double> keySetIterator = sortedMap.keySet().iterator();

			PrintWriter writer = new PrintWriter("Output2.txt","UTF-8");			
	        
	        while(keySetIterator.hasNext()){
	          Double key = keySetIterator.next();
	          writer.println(key + " " + sortedMap.get(key));	          
	        }
	        writer.close();
	    }
	}