Question

java

Part 1

Create a NetBeans project that asks for a file name. The file should contain an unknown quantity of double numeric values with each number on its own line. There should be no empty lines. Open the file and read the numbers. Print the sum, average, and the count of the numbers. Be sure to label the outputs very clearly. Read the file values as Strings and use Double.parseDouble() to convert them.

Part 2

Create a NetBeans project containing a menu-driven program. The menu items should be "Add Player", "Show All Players", and "Exit".

For "Add Player", ask the user to enter a player name and the player's numeric score. The score should be a positive integer. Store the player record to a CSV file where all the records are kept.

For "Show All Players", print the list of players and their scores.

For "Exit", confirm that the user wishes to exit.

Hint: Read the CSV file into an ArrayList of player objects. When you add a player, add it to the ArrayList and then rewrite the entire list. This is the easiest way to ensure that you do not lose any of the data.

Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
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Part1)

// Numbers.txt

45.57
65.67
87.76
65.45
34.56
89.90
99.87
76.66
55.54
37.77
88.83
65.54

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// ReadFileNos.java

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

public class ReadFileNos {

   public static void main(String[] args) {
       //Declaring variables
       String line,filename;
       int cnt = 0;
       double num, sum = 0, avg;

      

       /*
       * Creating an Scanner class object which is used to get the inputs
       * entered by the user
       */
       Scanner sc = new Scanner(System.in);
       System.out.print("Enter Filename :");
       filename=sc.next();
      
       try {
           //Open the input file
           Scanner file=new Scanner(new File(filename));
           while (file.hasNext()) {
               line = file.nextLine();
               sum += Double.parseDouble(line);
               cnt++;
           }
           sc.close();
           avg = sum / cnt;
           System.out.printf("Sum :%.2f\n" , sum);
           System.out.printf("Average :%.2f\n" , avg);
           System.out.println("The Count of Numbers :" + cnt);

       } catch (FileNotFoundException e) {
           System.out.println(e);
       }

   }

}
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Output;

Enter Filename :Numbers.txt
Sum :813.12
Average :67.76
The Count of Numbers :12

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2)

// playerData.csv

James
67
Thomas
90
Mike
87
Jimmy
78
Clark
65
Jack
98
Billy
94
Bob
85

// Player.java

public class Player {
   private String name;
   private int score;

   public Player(String name, int score) {
       this.name = name;
       this.score = score;
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public int getScore() {
       return score;
   }

   public void setScore(int score) {
       this.score = score;
   }

   @Override
   public String toString() {
       return "Player Name=" + name + ", Score=" + score;
   }

}

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// Test.java

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

public class Test {

   public static void main(String[] args) {
       String name;
       int score;

       /*
       * Creating an Scanner class object which is used to get the inputs
       * entered by the user
       */
       Scanner read = new Scanner(System.in);
       ArrayList<Player> arl = new ArrayList<Player>();
       try {
           Scanner sc = new Scanner(new File("playerData.csv"));
           while (sc.hasNext()) {
               name = sc.nextLine();
               score = Integer.parseInt(sc.nextLine());
               Player p = new Player(name, score);
               arl.add(p);
           }
           sc.close();
           while (true) {
               System.out.println("1.Add Player");
               System.out.println("2.Display All Players");
               System.out.println("3.Exit.");
               System.out.print("Enter Choice :");
               int choice = read.nextInt();

               switch (choice) {
               case 1: {
                   read.nextLine();
                   System.out.print("Enter Player Name :");
                   name = read.nextLine();
                   while(true)
                   {
                   System.out.print("Enter Score :");
                   score = read.nextInt();
                   if(score<0)
                   {
                       System.out.println("** Invalid.Must be positive **");
                   }
                   else
                       break;
                   }
                   Player p = new Player(name, score);
                   arl.add(p);
                   try {
                       FileWriter fw = new FileWriter(new File("playerData.csv"));
                       for (int i = 0; i < arl.size(); i++) {
                           fw.write(arl.get(i).getName() + "\n");
                           fw.write(arl.get(i).getScore() + "\n");

                       }
                       fw.close();
                   } catch (IOException e) {
                       System.out.println(e);
                   }

                   continue;
               }
               case 2: {
                   System.out.println("Displaying Players data :");
                   for (int i = 0; i < arl.size(); i++) {
                       System.out.println(arl.get(i));
                   }
                   continue;
               }
               case 3: {
                   break;
               }
               default: {
                   System.out.println("** Invalid Choice **");
                   continue;

               }

               }
               break;

           }

       } catch (FileNotFoundException e) {
           System.out.println(e);
       }

      
   }
}

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Output:

1.Add Player
2.Display All Players
3.Exit.
Enter Choice :1
Enter Player Name :Billy
Enter Score :94
1.Add Player
2.Display All Players
3.Exit.
Enter Choice :1
Enter Player Name :Bob
Enter Score :85
1.Add Player
2.Display All Players
3.Exit.
Enter Choice :2
Displaying Players data :
Player Name=James, Score=67
Player Name=Thomas, Score=90
Player Name=Mike, Score=87
Player Name=Jimmy, Score=78
Player Name=Clark, Score=65
Player Name=Jack, Score=98
Player Name=Billy, Score=94
Player Name=Bob, Score=85
1.Add Player
2.Display All Players
3.Exit.
Enter Choice :3

_______________Could you plz rate me well.Thank You