Question

Can you write with comments please. Thank you.

Write a Java Program that asks the user to enter the responses on the Console and write the responses to a text file called responses.txt (in the same directory as the program) Write another JAVA prorgram to read responses.txt file and calculate the frequency of each rating in the file and output the number and frequency in two columns (number, frequency) on the Console.

Answer 1

`Hey,

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1)

// FoodRating.java

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

public class FoodRating {

   public static void main(String[] args) throws IOException {
       /*
       * Creating an Scanner class object which is used to get the inputs
       * entered by the user
       */
       Scanner sc = new Scanner(System.in);
       int students[] = new int[10];

       for (int i = 0; i < students.length; ) {
           while(true)
           {
               System.out.print("\nEnter Student#" + (i + 1) + " rating :");
               students[i] = sc.nextInt();
               if(students[i]<1 ||students[i]>5)
               {
                   System.out.println("** Invalid.Must be between 1-5 **");
                   continue;
               }
               else
               {
                   i++;
                   break;
               }
           }

       }

       FileWriter fw = new FileWriter(new File("responses.txt"));
       for (int i = 0; i < students.length; i++) {
           fw.write(students[i] + " ");
       }
       fw.close();

   }

}
_______________________

Output:

Enter Student#1 rating :5

Enter Student#2 rating :4

Enter Student#3 rating :3

Enter Student#4 rating :4

Enter Student#5 rating :4

Enter Student#6 rating :2

Enter Student#7 rating :1

Enter Student#8 rating :3

Enter Student#9 rating :4

Enter Student#10 rating :5

_____________________

// responses.txt (Output file)

5 4 3 4 4 2 1 3 4 5

_____________________

2)

// CalculateRatingFrequency.java

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class CalculateRatingFrequency {

   public static void main(String[] args) throws FileNotFoundException {
       //Creating one-Dimensional array which hold frequencies
       int freq[]=new int[5];
       //Opening the input file
       Scanner sc=new Scanner(new File("responses.txt"));
      
       //reading the data from the file
       while(sc.hasNext())
       {
           freq[sc.nextInt()-1]++;
       }
      
       //Displaying the frequencies
       System.out.println("Number\tFrequency");
       System.out.println("------\t--------");
       for(int i=0;i<freq.length;i++)
       {
           System.out.println((i+1)+"\t\t"+freq[i]);
       }
      

   }

}
__________________________

Output:

Number   Frequency
------   --------
1       1
2       1
3       2
4       4
5       2

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