Question

use  JOptionPane to display output

Can someone please help write a program in Java using loops, not HashMap Test 1 Grades After the class complete the first exam, I saved all of the grades in a text file called test1.txt. Your job is to do some analysis on the grades for me. Input: There will not be any input for this program. This is called a batch program because there will be no user interaction other than to run the program. The data that you will need is stored in the accompanying file call test1.txt. You will have to open the file and read the scores into the program one at a time. Output: The output should include the following: o The number of students who took the test. o The number of students who received each of the letter grades A, B, C, D, F. o The overall average for the class. Output should be displayed in a single Message box. This is the test1.txt file 80 82 77 44 35 77 88 89 93 94 72 83 85 75 75 87 86 94 93 58 68

Answer 1

Please find the answer below.
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GradeBatch.java

package fileIO;

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

import javax.swing.JOptionPane;

public class GradeBatch {

   public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       //loading name of file
       File file = new File("test1.txt"); //reading data from this file
       Scanner reader;
       try {
           //read file using scanner
           reader = new Scanner(file);
           int count = 0;
           int grades[] = {0,0,0,0,0};
           double total =0;
           while(reader.hasNextLine()){
               //read line
               int temp = reader.nextInt();
              
               if(temp>=90) grades[0]++;
               else if(temp>=80) grades[1]++;
               else if(temp>=70) grades[2]++;
               else if(temp>=60) grades[3]++;
               else grades[4]++;
               total +=temp;
               count++;
               //write the data
           }
           StringBuffer output = new StringBuffer();
           output.append("Total number of students : "+count+"\n");
           for(int i=0;i<5;i++){
               char g = (char) ('A'+i);
               output.append("Total number of students got grade "+g+": "+grades[i]+"\n");
           }
           output.append("Overall average "+total/count);
           JOptionPane.showMessageDialog(null, output.toString());
       } catch (FileNotFoundException e) {
           System.out.println("file not found");
       }
       sc.close();
   }

}

F# - 1 - 1 - - - D GradeBatch.java test 1.txt X 180 82 77 44 35 77 88 89 93 94 72 83 85 75 75 87 86 94 93 58 68 A Message Total number of students : 21 Total number of students got grade A: 4 Total number of students got grade B: 8 Total number of students got grade C: 5 Total number of students got grade D: 1 tal number of students got grade E: Overall average 77.85714285714286 | OK