Write a program that reads a text file called \"sales.txt\". The file contains w

Question

Write a program that reads a text file called "sales.txt". The file contains weekly sales information from a supermarket. Every line in the file contains three integers representing an item code (a number between 1 and 1000), the number of items sold during a week, and the total number of items originally in stock. For example, if a line in the file contains the following data: 1234 100 500, this means that 100 units of item number 1234 were sold from an original stock of 500 units. Your program should analyze the data stored in the file and generate a new file called "orders.trt". This file should contain the item codes and the number of items that must be ordered to replenish the stock. An item should be ordered if the remaining number of units in stock is lessthanorequalto 30% of the original. Each line of the generated file should include the code of the item that must be ordered along with the number of units that needs to be ordered to replenish the original stock. For example, if a line in the output file contains the following data: 5678 250, this means that 250 units of item number 5678 should be ordered.

Explanation / Answer

Please follow the code and comments for description :

CODE :

import java.io.BufferedReader; // required imports for the code
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.StringTokenizer;

public class salesDataExample { // class to run the code
  
    public static void main(String[] args) throws IOException { // driver method that throws any exceptions
      
        File outFile = new File("orders.txt"); // create a object for the output file
        if (!outFile.exists()) { // check for the existence and create one
            outFile.createNewFile();
        }
      
        FileWriter fw = new FileWriter(outFile.getAbsoluteFile()); // get the path of the file
        BufferedWriter bw = new BufferedWriter(fw); // create a writer object
      
        String currentLine; // local variables
        BufferedReader br = new BufferedReader(new FileReader("sales.txt")); // reader object for the input file
        while ((currentLine = br.readLine()) != null) { // check for null
          
            StringTokenizer st = new StringTokenizer(currentLine, " "); // token the data read based on the delimiter
            String itemCode = st.nextToken(); // get the tokens saved
            int itemSold = Integer.parseInt(st.nextToken()); // conver the data to int
            int totalItems = Integer.parseInt(st.nextToken());
          
            int remItems = totalItems - itemSold; // check for the left over items
            int leastItems = (int) ((int) totalItems * 0.3); // calculate the percent of the total items
          
            if (remItems <= leastItems) { // check for the items count
              
                bw.write(itemCode + " " + Integer.toString(totalItems - remItems)); // write the data to file the item code and the items needed to retain
                bw.write(" "); // new line character
              
            }
        }
        bw.close(); // closing the reader and the writers
        br.close();
    }
}

sales.txt :

234 100 500
856 280 280
657 64 300
741 2 600
124 582 600

orders.txt :

856 280
124 582

Hope this is helpful.

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