Write a program that reads a series of student names and exa

Write a program that reads a series of student names and exam scores from an input file, then calculates and prints the following: Each student\'s information the total number of students The maximum score The minimum score The average of all scores Each input file contains different number of records (lines). Each record consists of a student\'s last name and a single exam score. for this program, you can assume that all data will be valid. There is no need to check for invalid exam scores. Use print f to format all exam scores to 2 decimal places. Use print f to display student information in columns with consistent width. In addition to each student\'s name and exam score, print a student number corresponding to the order it was read from the data file (see Sample Output for an example). Your Submit j printout should use all the sample data in my examples below. You should have at least 5 .dat files. You may have more than 5 (if you want to add your own test data), but not fewer than 5.

Solution

StudentScore.java

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

public class StudentScore {

  
   public static void main(String[] args) throws FileNotFoundException {
       Scanner scan = new Scanner(System.in);
       System.out.println(\"Enter an input file name : \");
       String fileName = scan.next();
       File file = new File(fileName);
       if(file.exists()){
           ArrayList<Integer> list = new ArrayList<Integer>();
           ArrayList<String> nameList = new ArrayList<String>();
           Scanner fileScan = new Scanner(file);
           while(fileScan.hasNextLine()){
               nameList.add(fileScan.next());
               list.add(fileScan.nextInt());
           }
           String heading1 = \"Student Name\";
           String heading2 = \"Student Score\";
          
           System.out.printf( \"%-15s %-15s\", heading1, heading2);
           System.out.println();
           for(int i=0; i<nameList.size(); i++){
               System.out.printf( \"%-15s %-15s\", nameList.get(i), list.get(i));
               System.out.println();
           }
           System.out.println(\"The total number of studnets: \"+nameList.size());
           System.out.println(\"The maximum score is \"+maxScores(list));
           System.out.println(\"The minimum score is \"+minScores(list));
           System.out.printf(\"THe average of all scores: %.2f\ \",averageScores(list));
       }
       else{
           System.out.println(\"File does nt exist\");
       }

   }
   public static double averageScores(ArrayList scoreList){
       double sum = 0;
       for(int i=0; i<scoreList.size(); i++){
           sum = sum + Double.parseDouble(scoreList.get(i)+\"\");
       }
       return (double)sum/scoreList.size();
   }
   public static int maxScores(ArrayList scoreList){
       int maxScore = Integer.parseInt(scoreList.get(0)+\"\");
       for(int i=1; i<scoreList.size(); i++){
           if(maxScore < Integer.parseInt(scoreList.get(i)+\"\")){
               maxScore = Integer.parseInt(scoreList.get(i)+\"\");
           }
       }
       return maxScore;
   }  
   public static int minScores(ArrayList scoreList){
       int minScore = Integer.parseInt(scoreList.get(0)+\"\");
       for(int i=1; i<scoreList.size(); i++){
           if(minScore > Integer.parseInt(scoreList.get(i)+\"\")){
               minScore = Integer.parseInt(scoreList.get(i)+\"\");
           }
       }
       return minScore;
   }
}

Output:

Enter an input file name :
D:\\\\scores.txt
Student Name Student Score
Suresh 45   
Sekhar 55   
Anshu 77   
Revathi 99   
The total number of studnets: 4
The maximum score is 99
The minimum score is 45
THe average of all scores: 69.00

scores.txt

Suresh 45
Sekhar 55
Anshu 77
Revathi 99