Question

This is a request for Java High Scores Program with 2 files.

Rewrite the high scores assignment(code below) so that the names and scores are stored in an array of HighScore objects instead of parallel ArrayLists.

The new Program should have the same output as the original. Here is a sample run of the program:

Enter the name for score #1: Suzy

Enter the score for score #1: 600

Enter the name for score #2: Kim

Enter the score for score #2: 9900

Enter the name for score #3: Bob

Enter the score for score #3: 1012

Enter the name for score #4: Armando

Enter the score for score #4: 8000

Enter the name for score #5: Tim

Enter the score for score #5: 514

Top Scorers:

Kim: 9900

Armando: 8000

Bob: 1012

Suzy: 600

Tim: 514

Step 1: The HighScores class

Begin by creating the HighScore class. It should have the following design

Class HighScore

String name int score

HighScore(String n, int s) void setName(String n) String getName() void setScore(int s) int getScore()

Step 2: The HighScoresProgram

Create a separate file named HighScoresProgram.java. This file should contain a class that has only four following static methods.

public static void main(String args[])

public static void initialize(HighScores[] scores)

public static void sort(HighScores[] scores)

public static void display(HighScores[] scores)

The main method should allocate an array of five HighScore references, and then invoke the other three methods.

What to Submit?

Submit HighScores.java HighScoresProgram.java

Here is previous code to build from:

import java.util.*;

public class HighScores{
    public static void main(String[] args){

        ArrayList<String> names = new ArrayList<>();
        ArrayList<Integer> scores = new ArrayList<>();
        initialize(names, scores);
        sort(names, scores);
        System.out.println("\n\nTop Scorers:");
        display(names, scores);
    }
    // user input is done in a method named initialize
    public static void initialize(ArrayList<String> names, ArrayList<Integer> scores){
        int i=1;
        Scanner input=new Scanner(System.in);
        String choice;
        do{
            System.out.print("\nEnter the name for score #" + i + ": ");
            names.add(input.next());
            System.out.print("Enter the score for score #" + i + ": ");
            scores.add(input.nextInt());

            System.out.print("Do you want to add another score? (y/n): ");
            choice = input.next();
            i++;
        }
        while(choice.equalsIgnoreCase("Y"));
    }
    // function that sorts both array lists, based on the values in the scores array list
    public static void sort(ArrayList<String> names, ArrayList<Integer> scores){
        int count = scores.size();
        int tempScore;
        String tempName;
        for (int i = 0; i < count - 1; i++){
            for (int j = i + 1; j <  count; j++){
                if (scores.get(i) < scores.get(j)){
                    tempScore = scores.get(i);
                    scores.set(i, scores.get(j));
                    scores.set(j, tempScore);

                    tempName = names.get(i);
                    names.set(i, names.get(j));
                    names.set(j, tempName);
                }
            }
        }
    }
    // method that displays the contents of the two arraylists
    public static void display(ArrayList<String> names, ArrayList<Integer> scores){

        for (int i = 0; i < scores.size(); i++){
            System.out.println(names.get(i) + " : " + scores.get(i));
        }
    }
}

Answer 1

If you have any problem with the code feel free to comment.

Program

import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

class HighScore {
   //instance variables
   private String name;
   private int score;
  
   //constructor
   public HighScore(String name, int score) {
       this.name = name;
       this.score = score;
   }
  
   //all getters and setters
   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//string representation of object
   public String toString() {
       return name+": "+score;
   }

}

public class Test {
   public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       System.out.print("How many student you want to enter? ");
       int size = sc.nextInt();//getting the size of the array
       sc.nextLine();

       HighScore[] scores = new HighScore[size];

       initialize(scores, sc);
       sort(scores);
       display(scores);

       sc.close();
   }

   private static void display(HighScore[] scores) {
       System.out.println("Top Scorers: ");
       for(HighScore i: scores)
           System.out.println(i);//displaying the result
   }
  
   //performing sort
   private static void sort(HighScore[] scores) {
       //using comparator for sorting
       Comparator<HighScore> comp = (i, j) -> {//using lamda expression
           return i.getScore() > j.getScore() ? -1 : 1;
       };
      
       Arrays.sort(scores, comp);//sorting the array
   }
  
   //loading the array
   private static void initialize(HighScore[] scores, Scanner sc) {
       for(int i=0; i<scores.length; i++) {
          
           //taking input
           System.out.print("Enter the name for score #"+(i+1)+": ");
           String name = sc.nextLine();
           System.out.print("Enter the score for score #"+(i+1)+": ");
           int score = sc.nextInt(); sc.nextLine();
          
           scores[i] = new HighScore(name, score);//storing it in the array
       }
   }
}

Output