Question

this is a java course class.

Please, I need full an accurate answer. Labeled steps of the solution that comply in addition to the question's parts {A and B}, also comply with:

(Create another file to test the class and output to the screen, not an output file)

please, DO NOT COPY others' solutions. I need a real worked answer that works when I try it on my computer.

Thanks in advance.

Write the definition of the class Tests such that an object of this class 13. a. can store a student's first name, last name, five test scores, average tests score, and grade. (Use an array to store the test scores.) Add constructors and methods to manipulate data stored things, your class must contain methods to calculate test averages, return test averages, calculate grades, return grades, and modify individual test scores. The method tostring must return test data (including student's name, five test scores, average, and grade) Write a program to calculate students' average test scores and the grade. You may assume the following input data: in an object. Among other as a string b. Jack Johnson 85 83 Lisa Aniston 80 90 95 93 48 Andy Cooper 78 81 11 90 73 Ravi Gupta 92 83 30 69 87 Bonny Blair 23 45 96 38 59 Danny ciark 60 85 Samantha Kennedy 77 31 52 74 83 77 91 76 45 39 67 Robin Bronson 93 94 89 77 97 Sheila Sunny 79 85 28 93 82 Kiran Smith 85 72 49 75 63 to store each possible to the following Use an array of objects of the class Tests (designed in part (a)) student's data. The program should output data as close as form: Test4 First Name Last Name Testl Test2 Test3 Test5 Average Grade Jack Johnson 85.00 83.00 77.00 91.00 76.00 82.40 B Lisa Aniston 80.O0 90.00 95.00 93.O0 48.O0 81.20 B 81.00 66.60 Andy Cooper Gupta 78.00 11.00 90.00 73.00 83.00 30.00 Ravi 92.00 69.00 87.00 72.20 C 52.20 Bonny Blair 23.00 45.00 96.00 38.00 59.00 Clark Kennedy 67.00 60.00 85.00 45.00 39.00 59.20 Danny Samantha 77.00 31.00 52.00 74.00 83.00 63.40 93.00 79.00 Robin Bronson 94.00 89.00 77.00 97.00 90.00 heila unny 85.00 28.c 93.00 82.00 73.40 75.00 63.00 Kiran Smith 85.00 72.00 49.00 68.80 Class average 70.94 AAAU AUA

Answer 1

For (a) refer Tests class.

For (b) refer Students class.

SOURCE CODE:

*Please follow the comments to better understand the code.

**Please look at the Screenshot below and use this code to copy-paste.

***The code in the below screenshot is neatly indented for better understanding.

import java.io.*;

class Tests
{
   String firstName;
   String lastName;
   double[] testScores;
   double avg;
   char grade;
  
   //Constructor for the class
   public Tests(String firstName,String lastName,double[] testScores)
   {
       this.firstName=firstName;
       this.lastName=lastName;
       this.testScores=testScores;      
   }
  
   //Calculate the average of the tests
   public double calculateAverage()
   {
       double sum=0;
       for(int i=0;i<5;i++)
           sum+=testScores[i];
       avg=sum/5;
       grade=calculateGrade();
       return avg;
   }
  
   //calculate the grade
   public char calculateGrade()
   {
       if(avg>=90) return 'A';
       if(avg>80) return 'B';
       if(avg>70) return 'C';
       if(avg>60) return 'D';
       return 'F';
   }
  
   //Overload the string
   public String toString()
   {
       return String.format("%1$-10s %2$-10s %3$5.2f %4$5.2f %5$5.2f %6$5.2f %7$5.2f %8$10.2f %9$5c",
       firstName,lastName,testScores[0],testScores[1],testScores[2],testScores[3],testScores[4],avg,grade);
   }
}

public class Students
{
   public static void main(String[] args)
   {
       int count=4,index=0;
       Tests[] t=new Tests[count];
       BufferedReader reader;
       try
       {
           //Read the File
           reader = new BufferedReader(new FileReader("data.txt"));
           String line = reader.readLine();
           while (line != null)
           {              
               //Process the line into separate strings
               String[] student=line.split(" ");
               String firstName=student[0];
               String lastName=student[1];
               double[] testScores=new double[5];
              
               //Store scores into the testScores
               for(int i=0;i<5;i++)
                   testScores[i]=Integer.parseInt(student[i+2]);
              
               t[index++]=new Tests(firstName,lastName,testScores);
                              
               //Read next line
               line = reader.readLine();
           }
           System.out.println(String.format("%1$-10s %2$-10s %3$5s %4$5s %5$5s %6$5s %7$5s %8$10s %9$7s",
           "First_Name","Last_Name","Test1","Test2","Test3","Test4","Test5","Average","Grade"));
           for(Tests test:t)
           {
               //Calculate the AVerage and Grade here
               test.calculateAverage();
               test.calculateGrade();
              
               //Print the object
               System.out.println(test);
           }

double cls_avg=0;
           for(Tests test:t)
           {
               cls_avg+=test.avg;
           }
           System.out.println("Class Average is: "+cls_avg/count);
           reader.close();
       }
       catch (IOException e)
       {
           e.printStackTrace();
       }
   }
}

===================================================

SCREENSHOT FOR THE CODE:

import java.io.; 1 class Tests 3 4 String firstName; double[] testScores; double avg; char grade; 7 9 10 //Constructor for the class 11 public Tests(String firstName, String lastName, double [] testScores) 12 13 this.firstName-firstName; 4 this.testScores testScores; 16 17 18 /Calculate the average of the tests public double calculateAverage() 19 26 21 double sum-0; for (int i-0;i<5; i++) 22 2 : testScores [ i ] ; avg-sum/5; grade-calculateGrade ( ); 25 26 return avg; 27 28 29 //calculate the grade public char calculateGrade () 36 32 32 if ( avg>=90) return 'A'; if (avg>80) return 'B'; 33 34 Elave 60) return 'D': 36 return 'F'; 37 38 39

39 //Overload the string public String toString() 4е 41 return String.format("%1$-10s %2$-10s %3$5 .2f %4$5.2f %5$5.2f %6$5.2f %7$5.2f %8$10.2f %9$5c", firstName, lastName, testScores [0], testScores [1], testScores [2] , testScores [3], testScores [4] , avg, grade); иЕ 44 45 46 47 4я public class Students 50 f ис public static void main( String [] args) int count 4, index 0; Tests [] t-new Tests [ count]; BufferedReader reader; 53 54 55 56 trv 57 58 //Read the File reader new BufferedReader (new File Reader ("data.txt")) String E null) ile (line 59 reader.readLine() 62 //Process the line into separate strings String] student=line. split (" "); String firstName= student [0]; String lastName-student [1]; double[] testScores=new double [5]; 63 64 65 66 67 68 //Store scores into the testScores for st Scores [i] = Integer. parseInt 71 udent [i+2 ] ) ; t[index++]=new Tests (firstName, lastName, testScores ) ; 73 74 //Read next line line reader.readLine ( ) 75 76 77 78

System.out.println (String. format ("%1$-10s %2$-10s %3$5s %4$5s %5$5s %6$5s %7$5s %8$10s %9$7s", "First_Name", "Last_Name", "Test1", "Test2", "Test3", "Test4", "Test5", "Average", "Grade") ) for(Tests test: t) 79 80 81 82 //Calculate the AVerage and Grade here test.calculateAverage ( ); test.calculateGrade ( ) ; 83 84 //Print the object System.out.println (test) ; } reader.close (); } catch (IOException e) { e.printStackTrace (); 87 88 89 90 91 92 93 94 96 97 98

OUTPUT:

GCAWindows System32 cmd.exe C:\Users\HP\Desktop>javac Students.java C: \Users\HP\Desktop>java Students First_Name Last_Name Test1 Test2 Test3 Test4 Test5 Average Grade Jack Johnson 85.00 83.00 77.00 91.00 76.00 82.40 Lisa Aniston 80.00 90.00 95.00 93.00 48.00 81.20 1 Jack Johnson 85 83 77 91 76 Lisa Aniston 80 90 95 93 48 3 Andy Cooper 78 81 11 90 73 Ravi Gupta 92 83 30 69 87 Andy Cooper Gupta class Average 78.00 81.00 11.00 90.00 73.00 66.60 2 .00 69.00 87.00 72.20 C V1 75.600090g9ee991 4 c: \Users\HP\Desktop> Input File

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